526 atomic, cross-linked cards. Each carries a definition, why it matters for CAPF, a common confusion, and a one-line recall. Grouped by subject; jump to a subject below.
Abrogation of Article 370 Definition The constitutional process by which the special status of Jammu and Kashmir under Article 370 was made inoperative in August 2019, and the State was reorganised into two Union Territories. Key points Article 370 gave Jammu and Kashmir special autonomy, including its own Const
Adjournment Motion Definition A motion to adjourn the ordinary business of the House to discuss a definite matter of urgent public importance, carrying an element of censure of the government. Key points Available only in the Lok Sabha; it is not allowed in the Rajya Sabha. It needs the support of at least 50 m
Adjournment, Prorogation and Dissolution Definition The three ways in which the working of Parliament is suspended or ended: adjournment (a short break in a sitting), prorogation (the end of a session), and dissolution (the end of the life of the Lok Sabha). Key points Adjournment suspends a sitting for hours, d
Advocate General of a State Definition The highest law officer of a State government and its chief legal adviser, the Statelevel counterpart of the Attorney General of India. Key points Constitutional office under Article 165; appointed by the Governor from among persons qualified to be a High Court judge. Advi
AFSPA (Armed Forces Special Powers Act) Definition The Armed Forces (Special Powers) Act, 1958, which grants special powers to the armed forces in areas declared "disturbed", including the power to use force, search, and arrest with legal protections. Key points Applies in areas notified as "disturbed" by the Ce
AntiDefection Law Definition The set of provisions in the Tenth Schedule of the Constitution that disqualifies legislators who defect from the party on whose ticket they were elected. Key points Added by the 52nd Amendment, 1985; the Tenth Schedule lists the grounds for disqualification. Grounds: voluntarily gi
Article 356 Misuse and the Bommai Safeguards Definition The pattern of partisan use of President's Rule under Article 356, and the judicial limits the Supreme Court placed on it through the S. R. Bommai judgment (1994). Key points Article 356 lets the Centre take over a State on failure of constitutional machine
Article 371 Special Provisions Definition The set of provisions in Articles 371 to 371J that grant special arrangements to certain States, mainly to protect tribal interests, regional development, and local customs. Key points These are permanent special provisions, unlike the temporary [[conceptarticle370abroga
Assam Rifles Definition The oldest central paramilitary force in India, primarily responsible for guarding the IndiaMyanmar border and conducting counterinsurgency operations in the NorthEast. Key points It traces its origin to the Cachar Levy raised in 1835, making it the oldest of the central armed forces; it
Attorney General of India Definition The highest law officer of the Union government and its chief legal adviser, who represents the Government of India before the Supreme Court. Key points Constitutional office under Article 76; appointed by the President from among persons qualified to be a Supreme Court judge
Attorney General vs Solicitor General vs Advocate General Definition A comparison of the three top government law officers in India, distinguishing their constitutional or statutory basis, level and qualifications. Key points The [[conceptattorneygeneral|Attorney General]] (Article 76) is the only law officer na
Basic Features (Illustrative List) Definition The set of essential elements of the Constitution that, under the [[conceptbasicstructure]] doctrine, Parliament cannot destroy through amendment. The courts have never fixed an exhaustive list; features are recognised case by case. Key points The doctrine was laid d
Basic Structure Doctrine Definition The judgemade doctrine that Parliament can amend the Constitution under Article 368 but cannot alter or destroy its essential framework, the "basic structure". Key points Laid down in Kesavananda Bharati v. State of Kerala (1973), which overruled the earlier Golak Nath (1967)
Calling Attention Motion Definition A device by which a member, with prior notice, calls the attention of a minister to a matter of urgent public importance and seeks an authoritative statement. Key points It is an Indian innovation introduced in 1954; it is mentioned in the rules of procedure but not in the Con
Censure Motion Definition A motion expressing the House's strong disapproval of the policies or conduct of the government or a particular minister, which must state the grounds of censure. Key points It can be moved against an individual minister, a group of ministers, or the entire Council of Ministers. Unlike
Central Administrative Tribunal (CAT) Definition The specialised tribunal that adjudicates disputes relating to the recruitment and conditions of service of persons appointed to public services under the Union. Key points Constitutional backing comes from Article 323A (added by the 42nd Constitutional Amendment
Central Armed Police Forces (Overview) Definition The umbrella term for the five armed central forces under the Ministry of Home Affairs, the Assam Rifles, and the National Security Guard, raised to assist in internal security, border guarding, and the protection of vital installations. Key points The five force
Central Industrial Security Force (CISF) Definition A Central Armed Police Force under the Ministry of Home Affairs, raised under the CISF Act, 1968, to provide security to industrial undertakings, critical infrastructure, and other vital installations. Key points It was raised in 1969 to protect publicsector un
Central Information Commission (CIC) Definition The apex appellate authority under the Right to Information Act, 2005, that hears second appeals and complaints relating to access to information held by central public authorities. Key points Statutory body established under the Right to Information Act, 2005; con
Central Vigilance Commission (CVC) Definition The apex integrity and anticorruption monitoring body of the Union government, which superintends vigilance administration in central organisations. Key points Set up in 1964 on the recommendation of the Santhanam Committee; given statutory status by the Central Vigi
Coastal Security Architecture Definition The layered, threetier system of agencies guarding India's coastline and maritime zones, reorganised after the 26 November 2008 Mumbai attacks, which were carried out by terrorists arriving by sea. Key points India has a coastline of about 7,517 km (mainland and islands),
Collegium System Definition The judgeled mechanism for appointing and transferring judges of the Supreme Court and High Courts, in which a collegium of senior judges recommends names to the President. Key points Based on Articles 124 and 217 read with the "Three Judges Cases" (1981, 1993, 1998), which gave prima
Comptroller and Auditor General (CAG) Definition The constitutional authority that audits the accounts of the Union and the States and reports on how public money is spent, the guardian of the public purse. Key points Established under Article 148; appointed by the President for six years or until 65 years, whic
Comptroller and Auditor General (functions and audits) Definition The detailed mandate of the CAG: the range of audits it conducts and the constitutional and statutory framework governing its duties. Key points Duties and powers are governed by Article 149 and the Comptroller and Auditor General's (Duties, Power
Confidence Motion and Floor Test Definition A motion moved by the government to prove that it commands the confidence of the House, tested through a vote on the floor known as the floor test. Key points The government moves it to demonstrate majority, often when asked by the President or Governor after a doubt a
Constitutional Morality Definition The principle that the conduct of the State, institutions and citizens must conform to the values and spirit of the Constitution (such as liberty, equality, dignity and the rule of law), rather than to prevailing social or popular morality. Key points The phrase was used by B.R
Constitutional vs Statutory vs Executive Bodies Definition A classification of public bodies by their legal source: constitutional bodies derive from the Constitution, statutory bodies from an Act of Parliament or a State legislature, and executive (nonstatutory) bodies from a government order or resolution. Key p
Contempt of Court Definition Conduct that disobeys or disrespects a court of law, or that obstructs or lowers the authority and administration of justice. Indian law divides it into civil contempt and criminal contempt. Key points Governed mainly by the Contempt of Courts Act, 1971, and by constitutional powers:
Cut Motions Definition Motions moved in the Lok Sabha to reduce the amount of a demand for grants during the discussion on the Budget, used to express disapproval of government policy. Key points They are moved only in the Lok Sabha, during the voting on demands for grants. There are three kinds: Policy Cut:
Delimitation Definition The process of fixing the number and boundaries of territorial constituencies for the Lok Sabha and the State legislative assemblies, carried out by a Delimitation Commission. Key points Article 82 requires readjustment of constituencies after every census, through a Delimitation Act made
Directive Principles of State Policy Definition The nonjusticiable guidelines for governance in Part IV of the Constitution (Articles 36 to 51) that direct the State towards social and economic justice. Key points Contained in Part IV (Art 36 to 51); borrowed from the Irish Constitution. Nonjusticiable: not enf
Doctrine of Colourable Legislation Definition The principle that a legislature cannot do indirectly what it is forbidden to do directly; if it lacks competence over a subject, it cannot achieve the same result by disguising the law under a head it does have power over. Captured by the maxim "what cannot be done dire
Doctrine of Eclipse Definition The rule that a preConstitution law inconsistent with a Fundamental Right is not dead but only "eclipsed" or rendered dormant; it remains on the statute book and revives in full if the relevant Fundamental Right is later amended to remove the inconsistency. Key points Based on Arti
Doctrine of Harmonious Construction Definition A rule of interpretation that when two provisions of the Constitution or a statute appear to conflict, the courts should read them so as to give effect to both, rather than letting one override or render the other redundant. Key points The court presumes that the ma
Doctrine of Laches Definition The equitable principle that a court may decline relief to a person who has slept on his rights and approached the court after unreasonable and unexplained delay, where that delay has prejudiced the other side or settled rights have arisen. "Laches" means negligent or undue delay. Key
Doctrine of Pith and Substance Definition A federalism rule that to judge a law's validity the court looks at its true nature and character (its "pith and substance"), and if that falls within the legislature's assigned field, the law is valid even if it incidentally encroaches on a subject in another list. Key po
Doctrine of Pleasure Definition The English commonlaw rule, adapted in Article 310, that civil servants of the Union or a State hold office "during the pleasure" of the President or Governor, meaning their tenure can be terminated without a contractual right to a fixed term. Key points Article 310 states that me
Doctrine of Prospective Overruling Definition The technique by which a court, while declaring a law or an earlier interpretation invalid, applies the new ruling only to future cases and transactions, leaving past actions taken under the old understanding undisturbed. Key points It avoids the chaos of reopening s
Doctrine of Repugnancy (Article 254) Definition The rule for resolving conflict between a Union law and a State law made on the same Concurrent List subject: under Article 254 the Union law prevails and the State law becomes void to the extent of the repugnancy. Key points Applies to subjects in List III (the Co
Doctrine of Severability Definition The rule that when only a part of a law is unconstitutional, the courts strike down only the offending part and keep the rest valid, provided the valid portion can stand independently. Also called the doctrine of separability. Key points Anchored in the words "to the extent of
Doctrine of Territorial Nexus Definition The rule that a State legislature can make a law operating on persons, property or objects located outside its territory, provided there is a real and sufficient connection (nexus) between the State and that subject matter. Key points Flows from Article 245: Parliament ca
Double Jeopardy Definition The protection that a person shall not be prosecuted and punished for the same offence more than once. Guaranteed in India by Article 20(2). It rests on the maxim "nemo debet bis vexari" (no one should be twice vexed for the same cause). Key points Article 20(2): "No person shall be pr
Eighth Schedule Definition The schedule of the Constitution that lists the languages officially recognised by the Indian State, currently numbering 22. Key points It is linked to Articles 344(1) and 351 and deals with the recognised languages and the development of Hindi. It originally listed 14 languages; the
Election Commission of India (ECI) Definition The constitutional body that superintends, directs and controls elections to Parliament, the State legislatures, and the offices of President and VicePresident. Key points Established under Article 324; a permanent, independent body. A multimember body since 1993: t
Eleventh and Twelfth Schedules Definition The two schedules that list the functional subjects which may be devolved to rural local bodies (Panchayats) and urban local bodies (Municipalities) respectively. Key points Eleventh Schedule was added by the 73rd Amendment, 1992, and lists 29 subjects for Panchayati Raj
Emergency Provisions Definition The provisions in Part XVIII (Articles 352 to 360) that let the Centre assume extraordinary powers during a grave threat to the nation, a State, or financial stability. Key points National Emergency (Art 352): on grounds of war, external aggression or armed rebellion; "internal di
ExPostFacto Law Definition A law that operates retrospectively to make an act a crime that was not a crime when committed, or to increase the penalty for an act after it was done. The Constitution prohibits this in criminal matters under Article 20(1). Key points Article 20(1): no person shall be convicted of an
Fifth Schedule Definition The schedule that provides for the administration and control of Scheduled Areas and Scheduled Tribes in States other than the four northeastern States covered by the Sixth Schedule. Key points It draws from Article 244(1) and applies to Scheduled Areas in States such as Jharkhand, Chha
Finance Commission Definition A constitutional body set up every five years to recommend how the Centre's tax revenues are shared with the States and among the States. Key points Constituted by the President under Article 280, normally every fifth year or earlier. Recommends the vertical devolution (Centre to S
Finance Commission vs Planning Commission Definition A comparison of the two main instruments of resource transfer from the Centre to the States: the constitutional Finance Commission and the erstwhile executive Planning Commission (now NITI Aayog). Key points The [[conceptfinancecommission|Finance Commission]]
Financial Intelligence Unit (FIUIND) Definition India's central national agency for receiving, processing, analysing and disseminating information about suspicious and highvalue financial transactions, to counter money laundering and the financing of terrorism. Key points The Financial Intelligence Unit, India (
Fundamental Duties Definition The moral obligations of citizens listed in Article 51A (Part IVA) of the Constitution, added to promote a sense of discipline and commitment to the nation. Key points Contained in Part IVA, Article 51A; added by the 42nd Amendment, 1976, on the Swaran Singh Committee's recommendati
Fundamental Rights Definition The six categories of justiciable rights in Part III of the Constitution (Articles 12 to 35) that are enforceable against the State and protect basic civil liberties. Key points Six categories: Equality (14 to 18), Freedom (19 to 22), against Exploitation (23 to 24), Freedom of Reli
GST Council Definition The apex federal body that makes recommendations on all matters relating to the Goods and Services Tax, a flagship example of cooperative fiscal federalism. Key points Constitutional body created by the 101st Constitutional Amendment Act, 2016, under Article 279A; constituted in September
Indian Coast Guard (ICG) Definition India's armed maritime lawenforcement and searchandrescue service, raised under the Coast Guard Act, 1978, to protect maritime and other national interests in India's maritime zones. Key points It was formally constituted on 1 February 1977 (the Act came in 1978) on the recomm
InterState Council Definition A constitutional advisory forum for coordination between the Centre and the States, and among the States, on matters of common interest. Key points Constitutional provision under Article 263, which empowers the President to establish such a Council. It was actually set up in 1990 b
Joint Sitting of Parliament Definition A combined meeting of both Houses of Parliament summoned by the President to resolve a deadlock over an ordinary Bill, under Article 108. Key points Provided under Article 108; the President summons it and the Speaker of the Lok Sabha presides (the Rajya Sabha Chairman does
Judicial Activism vs Judicial Restraint Definition Two contrasting judicial philosophies. Judicial activism is the proactive use of judicial power to protect rights and direct policy, sometimes entering the domain of the legislature or executive; judicial restraint is the disciplined approach of deciding only the ca
Judicial Review Definition The power of the courts to examine laws, executive actions and constitutional amendments, and to declare them void if they violate the Constitution. Key points Flows mainly from Articles 13, 32, 131 to 136, 226 and 227; Article 13 makes laws inconsistent with Fundamental Rights void.
Living Constitution Definition The idea that the Constitution is a dynamic, evolving document whose provisions are to be interpreted in the light of changing social, economic and technological conditions, rather than frozen to the framers' original understanding. Key points It treats the Constitution as an organ
Locus Standi Definition A Latin term meaning "place to stand", referring to the right or capacity of a person to bring a matter before a court. Traditionally only a person whose own legal right has been violated could approach the court. Key points Under the classical rule, a petitioner needed a direct, personal
Lokayukta Definition The Statelevel anticorruption ombudsman that inquires into allegations of corruption and maladministration against public functionaries in a State. Key points A statutory office created by individual State legislation; Maharashtra was the first State to establish a Lokayukta (in 1971), and O
Lokpal Definition The national anticorruption ombudsman set up under the Lokpal and Lokayuktas Act, 2013, to inquire into allegations of corruption against public functionaries, including the Prime Minister. Key points Statutory body created by the Lokpal and Lokayuktas Act, 2013 (which came into force in Januar
Money Bill Definition A Bill that deals only with matters specified in Article 110, such as taxation, government borrowing, and the Consolidated Fund of India, certified as such by the Speaker of the Lok Sabha. Key points Defined in Article 110; the Speaker's certification that a Bill is a Money Bill is final.
Money Bill vs Finance Bill Definition The distinction between a Money Bill (defined narrowly in Article 110) and the broader category of Financial Bills (Article 117), which decides where a Bill can be introduced and what powers the Rajya Sabha has. Key points A Money Bill deals only with matters in Article 110
MultiAgency Centre (MAC) Definition A common counterterrorism intelligencesharing platform housed in the Intelligence Bureau, designed to pool and disseminate terrorismrelated intelligence among central and State agencies in real time. Key points It was set up in the aftermath of the Kargil conflict on the recom
National Commission for Backward Classes (NCBC) Definition The body that examines requests for inclusion in, and complaints relating to, the central list of Other Backward Classes and safeguards their interests. Key points Originally a statutory body set up under the National Commission for Backward Classes Act,
National Commission for Minorities (NCM) Definition The statutory body that monitors and evaluates the working of safeguards for notified minority communities and looks into specific complaints of deprivation of their rights. Key points Statutory body set up under the National Commission for Minorities Act, 1992
National Commission for Protection of Child Rights (NCPCR) Definition The statutory body that ensures all laws, policies and programmes are in harmony with child rights as enshrined in the Constitution and the UN Convention on the Rights of the Child. Key points Statutory body set up under the Commissions for Pr
National Commission for Safai Karamcharis (NCSK) Definition The body set up to safeguard the interests and welfare of safai karamcharis (sanitation workers) and to monitor the abolition of manual scavenging. Key points Originally a statutory body under the National Commission for Safai Karamcharis Act, 1993; tha
National Commission for Scheduled Castes (NCSC) Definition The constitutional body that investigates and monitors safeguards provided for the Scheduled Castes and protects them against deprivation of their rights. Key points Constitutional body under Article 338; the present separate Commission emerged after the
National Commission for Scheduled Tribes (NCST) Definition The constitutional body that investigates and monitors safeguards for the Scheduled Tribes and protects their rights, including in matters of land, forests and tribal development. Key points Constitutional body under Article 338A, created by the 89th Con
National Commission for Women (NCW) Definition The statutory body set up to review the constitutional and legal safeguards for women, recommend remedial measures and look into individual complaints and rights violations. Key points Statutory (not constitutional) body established under the National Commission for
National Human Rights Commission (NHRC) Definition The statutory watchdog body set up under the Protection of Human Rights Act, 1993, to protect and promote human rights in India. Key points Statutory (not constitutional), established under the Protection of Human Rights Act, 1993. Chairperson must be a former
National Intelligence Grid (NATGRID) Definition An integrated intelligence master database and technology platform that links the databases of various government agencies to provide quick access to information for counterterrorism and security purposes. Key points It was conceived after the 26 November 2008 Mumb
National Investigation Agency (NIA) Definition India's central counterterrorism lawenforcement agency, set up under the National Investigation Agency Act, 2008, to investigate and prosecute offences affecting national security. Key points Created in the aftermath of the 26 November 2008 Mumbai attacks; it functi
National Investigation Agency: Powers Definition The legal authority and jurisdiction of the National Investigation Agency (NIA), India's central counterterror and federal investigation agency, as defined by the National Investigation Agency Act, 2008, and its 2019 amendment. Key points The NIA was created by th
National Security Council (NSC) Definition The apex advisory body to the Prime Minister and the Government of India on matters of national security and strategic interest, coordinating the country's security policy. Key points It was constituted in 1998 to provide an integrated approach to national security, rep
National Security Guard (NSG) Definition India's elite federal counterterrorism and counterhijack contingency force, raised under the National Security Guard Act, 1986, and deployed for hostage rescue, neutralising terrorists, and VIP protection. Key points It was raised in 1984 and the Act passed in 1986, in th
NDMA and NDRF Definition The National Disaster Management Authority (NDMA) is India's apex body for disastermanagement policy, and the National Disaster Response Force (NDRF) is the specialised force for disaster response; both flow from the Disaster Management Act, 2005. Key points The Disaster Management Act,
Ninth Schedule Definition The schedule of the Constitution that lists laws shielded from challenge on the ground that they violate Fundamental Rights, originally added to protect landreform legislation. Key points It was added by the First Amendment, 1951, along with Article 31B, which gives the listed laws prot
NITI Aayog Definition The National Institution for Transforming India, the Centre's premier policy think tank set up in 2015 to replace the Planning Commission and to drive cooperative and competitive federalism. Key points Established by an executive resolution of the Union Cabinet on 1 January 2015; it is neit
NoConfidence Motion Definition A motion moved in the Lok Sabha to express that the House no longer has confidence in the Council of Ministers, which must resign if it is passed. Key points Moved under Rule 198 of the Lok Sabha rules; it can be moved only in the Lok Sabha, the House to which the government is res
One Border One Force Definition The principle, recommended by the Kargil Review Committee and the Group of Ministers report (2001), that each stretch of India's land border should be guarded by a single designated central force to ensure clear accountability. Key points The doctrine assigns one lead Border Guard
Ordinance Definition A law made by the executive when the legislature is not in session, having the same force as an Act of Parliament or a State legislature but only temporarily. Key points The President promulgates ordinances under Article 123; the Governor under Article 213. Possible only when the relevant H
Parliamentary Privileges Definition The special rights, immunities and exemptions enjoyed by the two Houses of Parliament collectively and by their members and committees individually, so that they can function freely and with authority. State legislatures enjoy parallel privileges. Key points Granted by Article
Point of Order Definition A device by which a member draws the attention of the Presiding Officer to a breach of the rules of procedure or of the Constitution during the proceedings of the House. Key points It relates only to the interpretation or enforcement of the rules of the House or relevant constitutional
Preamble Definition The introductory statement of the Constitution that declares its source of authority, the nature of the Indian State, the objectives it seeks to secure, and the date of its adoption. Key points Source: "We, the People of India" enact, adopt and give the Constitution to themselves; popular sov
President's Rule Definition The suspension of a State government and the assumption of its functions by the Centre when the constitutional machinery in the State fails, imposed under Article 356. Key points Article 356 allows the President, on the Governor's report or otherwise, to proclaim that the State cannot
Private Member's Bill Definition A Bill introduced by a member of Parliament who is not a minister, as opposed to a government Bill introduced by a minister. Key points Any member who is not a minister is a private member; the Bill expresses an individual member's legislative idea. It requires one month's notic
Privilege Motion Definition A motion moved by a member against a minister or another member for a breach of parliamentary privilege or contempt of the House. Key points Parliamentary privileges are the special rights of the Houses and their members, drawn from Article 105 (Parliament) and Article 122. A breach
Procedure Established by Law vs Due Process of Law Definition Two standards for protecting life and liberty. "Procedure established by law" (the Indian text of Article 21) asks only whether a valid law lays down a procedure; "due process of law" (the American standard) lets courts also test whether that law and proc
Protection against SelfIncrimination Definition The right that no person accused of an offence shall be compelled to be a witness against himself. Guaranteed by Article 20(3) and based on the maxim "nemo tenetur prodere accusare seipsum". Key points Article 20(3): "No person accused of any offence shall be compe
Public Accounts Committee (PAC) Definition The senior parliamentary financial committee that examines the audit reports of the Comptroller and Auditor General and scrutinises how the Government has spent the money voted by Parliament. Key points A parliamentary committee, first set up in 1921; it functions under
Public Interest Litigation (PIL) Definition Litigation filed to protect a public interest or the rights of a disadvantaged group, in which the rule that only an aggrieved person can approach the court (locus standi) is relaxed. Key points Developed by the Supreme Court from the late 1970s and early 1980s, associ
Question Hour Definition The first hour of a sitting of a House of Parliament, normally from 11 a.m. to noon, set aside for members to ask questions of ministers and hold the executive accountable. Key points It is governed by the rules of procedure of each House and is a key tool of legislative oversight. Ques
Quorum Definition The minimum number of members who must be present for a House of Parliament to conduct business validly. Key points Article 100(3) fixes the quorum at onetenth of the total number of members of the House, including the Presiding Officer. For the Lok Sabha (543 members) the quorum is 55; for th
Railway Protection Force (RPF) Definition An armed force of the Union under the Ministry of Railways, mandated to protect railway property, passenger areas, and passengers, and to ensure the security of rail travel. Key points It is governed by the Railway Protection Force Act, 1957, and functions under the Mini
Recognised Political Party Definition A political party that meets the voteshare or seat criteria laid down by the Election Commission and is therefore recognised as either a National Party or a State Party, with consequent privileges. Key points Recognition is governed by the Election Symbols (Reservation and A
Residuary Powers Definition The power to legislate on subjects not enumerated in any of the three lists of the [[conceptseventhschedule]]. In India these residuary powers are vested in Parliament (the Union), not the States. Key points Article 248 gives Parliament exclusive power to make laws on any matter not i
Rule of Law Definition The principle that the State and its officials are governed by law and not by arbitrary power, that all persons are equal before the law, and that no one is above the law. Associated with the British jurist A.V. Dicey. Key points Dicey's three elements: supremacy of law (no arbitrary power
Separation of Powers Definition The principle that the legislative, executive and judicial functions of government should be vested in separate organs so that no single organ accumulates unchecked power. Associated with the French thinker Montesquieu. Key points India follows a functional, not rigid, separation:
Seventh Schedule Definition The schedule of the Constitution that divides legislative powers between the Union and the States through three lists: the Union List, the State List, and the Concurrent List. Key points Drawn from Article 246; lists the subjects on which the Union Parliament and the State legislature
Short Duration Discussion Definition A discussion in either House on a matter of urgent public importance that does not require a formal motion or a vote, also called a twohour discussion. Key points It is also known as the twohour discussion because the time allotted is usually about that long. A member gives
Sixth Schedule Definition The schedule that provides for the administration of tribal areas in the four northeastern States of Assam, Meghalaya, Tripura, and Mizoram through autonomous district and regional councils. Key points It draws from Articles 244(2) and 275(1) and applies only to these four States. It c
Solicitor General of India Definition The secondranking law officer of the Union, who assists the Attorney General in representing the Government of India in court. Key points It is a statutory office, not a constitutional one; it has no separate mention in the Constitution (unlike the Attorney General under Art
Special Frontier Force (SFF) Definition A covert specialoperations paramilitary unit raised in 1962, in the aftermath of the IndiaChina war, for operations along the highaltitude IndiaChina frontier. Key points It was raised in November 1962 (originally as "Establishment 22") in the wake of the 1962 war with Chi
Special Officer for Linguistic Minorities Definition The constitutional officer charged with investigating all matters relating to the safeguards provided for linguistic minorities and reporting to the President. Key points Constitutional office under Article 350B, inserted by the 7th Constitutional Amendment Ac
Special Protection Group (SPG) Definition An armed force of the Union, raised under the Special Protection Group Act, 1988, dedicated to the proximate security of the Prime Minister of India. Key points It was raised in 1985 after the assassination of Prime Minister Indira Gandhi in 1984, and the SPG Act was ena
Starred vs Unstarred Questions Definition The two main categories of parliamentary questions, distinguished by how the answer is given and whether followup questions are allowed. Key points A starred question (marked with an asterisk) seeks an oral answer on the floor and permits supplementary questions. An uns
State Election Commission (SEC) Definition The constitutional body in each State that superintends, directs and controls elections to Panchayats and Municipalities (the local bodies). Key points Created by the 73rd and 74th Constitutional Amendment Acts, 1992, under Articles 243K (Panchayats) and 243ZA (Municipa
State Finance Commission (SFC) Definition The constitutional body that the Governor of each State sets up every five years to review the financial position of Panchayats and Municipalities and recommend how State revenues are shared with them. Key points Created by the 73rd and 74th Constitutional Amendment Acts
State Human Rights Commission (SHRC) Definition The Statelevel statutory watchdog for human rights, the regional counterpart of the National Human Rights Commission, set up under the same Act. Key points Statutory body constituted by a State Government under the Protection of Human Rights Act, 1993. Composition
State Public Service Commission (SPSC) Definition The Statelevel constitutional recruiting agency that conducts examinations for appointment to the services of a State and advises the State Government on service matters. Key points Constitutional body under the same cluster of Articles 315 to 323 that governs th
SubJudice Definition A Latin term meaning "under judgment", referring to a matter that is currently before a court and not yet decided. While a case is subjudice, public comment, media reporting or parliamentary discussion that could prejudice the proceedings is restrained. Key points The rule protects the fairn
Tenth Schedule Definition The schedule of the Constitution that contains the antidefection provisions, setting out the grounds and procedure for disqualifying legislators who defect. Key points Added by the 52nd Amendment, 1985, and linked to Articles 102(2) and 191(2). Grounds for disqualification: voluntarily
UAPA (Unlawful Activities Prevention Act) Definition The Unlawful Activities (Prevention) Act, 1967, India's principal antiterror law, which provides for the prevention of unlawful activities and terrorist acts and for banning organisations and individuals as terrorist. Key points Enacted in 1967 to deal with un
Union Public Service Commission (functions) Definition The central constitutional recruiting agency that conducts examinations for appointment to the allIndia and central services and advises the Government on service matters. Key points Constitutional body under Articles 315 to 323; the UPSC operates under Arti
Union Public Service Commission (UPSC) Definition The central constitutional body that conducts examinations and advises on recruitment to the AllIndia Services and the Central Services, including the CAPF (Assistant Commandants) exam. Key points Established under Article 315; its functions are listed in Article
Unlawful Activities (Prevention) Act: Provisions Definition The principal central antiterror law of India, the Unlawful Activities (Prevention) Act, 1967 (UAPA), and its key provisions for banning organisations, designating terrorists, and dealing with terror financing and "unlawful activities" that threaten the sov
Vote on Account Definition An advance grant by the Lok Sabha that lets the government meet expenditure for a short part of the financial year before the full Budget is passed. Key points Provided under Article 116; it is a grant in advance pending the regular passage of the Budget. It deals only with the expend
Whip Definition Both an official of a political party in the legislature who enforces party discipline, and the written direction that official issues to members on how to vote. Key points The whip ensures the attendance of party members and their voting along party lines. The strength of a whip is shown by und
Writs Definition The five formal written orders a court issues to enforce Fundamental Rights and legal rights: Habeas Corpus, Mandamus, Prohibition, Certiorari, and Quo Warranto. Key points Habeas Corpus: "produce the body", against unlawful detention. Mandamus: command to a public authority to perform its lega
Zero Hour Definition The informal period in a House of Parliament, immediately after the Question Hour, when members raise matters of urgent public importance without prior notice. Key points It begins around noon (hence the name "Zero Hour") and follows the Question Hour. It is an Indian innovation that starte
Zonal Councils Definition Statutory advisory bodies that promote cooperation and coordination among groups of neighbouring States on economic, social and security matters. Key points Statutory (not constitutional) bodies created by the States Reorganisation Act, 1956; there are five Zonal Councils: Northern, Cen
Agnipath Scheme Definition A shortterm military recruitment model for the Army, Navy and Air Force, introduced in 2022, under which young recruits called "Agniveers" are enrolled for a fouryear tenure, after which a portion is retained for regular service and the rest are released with a financial package. Key poi
Andaman and Nicobar Command (ANC) Definition India's first and only fully integrated triservice theatre command, based at Port Blair, responsible for the defence and security of the Andaman and Nicobar Islands and the surrounding sea lanes in the eastern Indian Ocean. Key points The ANC was set up in 2001 and is
BlueWater Navy Definition A navy with the capability to operate across the deep waters of the open oceans, far from its own coast, sustaining power projection and prolonged deployments well beyond home waters, as opposed to a coastal "brownwater" or regional "greenwater" force. Key points The terms describe reac
CeaseFire Line History Definition The historical evolution of the military demarcation between India and Pakistan in Jammu and Kashmir, from the CeaseFire Line (CFL) of the 1947 to 1948 war to the presentday Line of Control (LoC). Key points After the first IndiaPakistan war over Kashmir (1947 to 1948), a United
Chief of Defence Staff (CDS) Definition The singlepoint military adviser to the government on triservice matters and the head of the Department of Military Affairs in the Ministry of Defence, created to bring integration and "jointness" among the Army, Navy and Air Force. Key points The post was announced by the
Coastal Security Scheme Definition A centrally sponsored scheme of the Ministry of Home Affairs to strengthen the policing of India's coastline and territorial waters by building up the marine police forces of the coastal States and Union Territories with boats, stations, vehicles and equipment. Key points The s
Credible Minimum Deterrence Definition The guiding principle of India's nuclear doctrine, under which India keeps a nuclear arsenal that is the minimum needed to deter an adversary, yet credible enough (survivable and assured) that a potential aggressor believes retaliation is certain and unacceptable. Key points
Defence Acquisition Procedure (DAP) Definition The framework of rules and categories that governs how the Ministry of Defence buys capital equipment for the armed forces, designed to balance speed, transparency and the promotion of indigenous (Indian) defence manufacturing. Key points The current framework is th
Defence Cyber Agency (DCyA) Definition A triservice integrated agency of the armed forces, set up to handle the military dimension of cyber security and cyber operations across the Army, Navy and Air Force, under the Integrated Defence Staff. Key points The Defence Cyber Agency was established in 2019 as one of
Hot Pursuit Definition The act of pursuing and engaging fleeing armed adversaries (such as militants or insurgents) across a border or into a neighbouring State's territory, immediately after an attack, to neutralise them before they reach safety. Key points In international law, "hot pursuit" is most clearly re
Integrated Check Posts (ICPs) Definition Modern, singlewindow facilities at India's designated land border crossings that bring immigration, customs, security, quarantine and tradesupport services together in one complex, to streamline the movement of people and goods across international land borders. Key points
Integrated Defence Staff (IDS) Definition A triservice staff organisation in the Ministry of Defence that supports integrated planning, coordination and jointness among the Army, Navy and Air Force, and which provides the secretariat for the Chiefs of Staff Committee and the Chief of Defence Staff. Key points Th
Make in India in Defence Definition The set of policies aimed at reducing India's dependence on imported weapons by building a domestic defencemanufacturing base, raising indigenous content, and increasing defence exports under the wider "Atmanirbhar Bharat" (selfreliant India) goal. Key points India has long be
No First Use Policy (NFU) Definition A declared nuclear posture under which a State commits not to use nuclear weapons first in a conflict, reserving them only for retaliation against a nuclear (or, in India's stated formulation, a major chemical or biological) attack on it or its forces. Key points India declar
SecondStrike Capability Definition The ability of a State to absorb an enemy's first nuclear strike and still retain enough surviving nuclear forces to launch a devastating retaliatory strike, which is what makes a No First Use posture credible. Key points Secondstrike capability requires survivable, dispersed a
Smart Fencing and BOLDQIT Definition Technologydriven border surveillance systems that supplement physical fencing with sensors, cameras, radars and data networks to detect intrusion, especially in terrain (rivers, marshes) where a physical fence is not feasible. Key points The Comprehensive Integrated Border Ma
Strategic Forces Command (SFC) Definition The triservice command responsible for the management, custody and operational delivery of India's nuclear weapons and strategic (nuclearcapable) missiles, functioning under the Nuclear Command Authority. Key points The SFC was created in 2003 along with the formal Nucle
Surgical Strikes Definition Precise, limited and targeted military operations against specific objectives (such as terrorist launch pads), designed to inflict damage on the target while avoiding wider escalation or largescale conventional war. Key points India publicly announced "surgical strikes" across the Lin
TriService Theatre Commands Definition A proposed reorganisation of India's armed forces in which the Army, Navy and Air Force assets in a given geographic or functional area are placed under a single theatre commander for unified, integrated warfighting, replacing the present system of separate singleservice comman
Act East Policy Definition India's strategic and economic policy of deepening engagement with the countries of SouthEast Asia and the wider AsiaPacific, upgraded from the earlier Look East Policy. Key points The Look East Policy was launched in the early 1990s under Prime Minister P. V. Narasimha Rao to reconnec
Australia Group Definition An informal multilateral exportcontrol forum that seeks to ensure that exports do not contribute to the development of chemical or biological weapons. Key points It was formed in 1985, following the use of chemical weapons in the IranIraq war, and is chaired by Australia, which gives i
BIMSTEC Definition A regional grouping of seven countries around the Bay of Bengal, the Bay of Bengal Initiative for MultiSectoral Technical and Economic Cooperation, that links South Asia and SouthEast Asia. Key points It was established in 1997 (originally as BISTEC) and has its permanent secretariat in Dhaka,
BRICS Definition A grouping of major emerging economies that coordinate on economic, political, and development issues, originally Brazil, Russia, India, China, and South Africa. Key points The acronym BRIC was coined by economist Jim O'Neill in 2001; the countries began meeting as a group, and South Africa join
Chabahar Port Definition A deepwater port on the southeastern coast of Iran, developed with Indian involvement, that gives India sealand access to Afghanistan and Central Asia while bypassing Pakistan. Key points It is located on the Gulf of Oman in Iran's SistanBaluchestan province; India has been developing th
Chemical Weapons Convention (CWC) Definition A multilateral disarmament treaty that prohibits the development, production, stockpiling, transfer, and use of chemical weapons and requires their destruction. Key points It was opened for signature in 1993 and entered into force in 1997; it is one of the most widely
Comprehensive Convention on International Terrorism (CCIT) Definition A proposed United Nations treaty, championed by India, that would provide a single, universally agreed legal definition of terrorism and a common framework to prosecute or extradite terrorists, deny them safe havens, and cut off their funding. K
Comprehensive NuclearTestBan Treaty (CTBT) Definition A multilateral treaty that bans all nuclear explosions, for both civilian and military purposes, in all environments, intended to curb the development and qualitative improvement of nuclear weapons. Key points It was adopted by the UN General Assembly in 1996
Financial Action Task Force (FATF) Definition An intergovernmental body that sets global standards to combat money laundering, terrorist financing, and the financing of proliferation of weapons of mass destruction, and that monitors countries' compliance. Key points It was established in 1989 by the G7, with its
G20 (Group of Twenty) Definition The premier forum for international economic cooperation, made up of nineteen major economies, the European Union, and (from 2023) the African Union, accounting for the bulk of world output and trade. Key points Formed in 1999 at the financeminister level after the Asian financia
Geneva Conventions and International Humanitarian Law Definition The four Geneva Conventions of 1949, with their Additional Protocols, are the core of international humanitarian law, which regulates the conduct of armed conflict and protects those who are not, or are no longer, taking part in hostilities. Key poin
Indian Ocean Rim Association (IORA) Definition An intergovernmental organisation of States bordering the Indian Ocean that promotes regional economic cooperation, sustainable development, and maritime security among its members. Key points It was established in 1997 and has its secretariat in Ebene, Mauritius; i
Indus Waters Treaty Definition A watersharing treaty between India and Pakistan, brokered by the World Bank in 1960, that allocates the use of the waters of the Indus river system between the two countries. Key points It was signed in 1960 by Prime Minister Jawaharlal Nehru and President Ayub Khan of Pakistan, w
Indus Waters Treaty: Mechanism Definition The institutional and disputesettlement machinery of the Indus Waters Treaty of 1960 between India and Pakistan, which allocates the waters of the Indus river system and provides a graded process for resolving differences and disputes. Key points The treaty was signed in
International Solar Alliance (ISA) Definition A treatybased intergovernmental organisation, cofounded by India, that aims to mobilise solar energy deployment and investment among sunrich countries to address energy access and climate change. Key points It was launched jointly by India and France in 2015 at the P
Line of Actual Control Management Definition The set of agreements, protocols, and confidencebuilding measures through which India and China manage their disputed and undemarcated border, the Line of Actual Control (LAC), to maintain peace and tranquillity pending a final settlement. Key points The LAC runs abou
Missile Technology Control Regime (MTCR) Definition An informal, voluntary multilateral exportcontrol grouping that seeks to limit the proliferation of missiles and unmanned delivery systems capable of carrying weapons of mass destruction. Key points It was established in 1987 by the G7 countries; it is a volunt
Neighbourhood First Policy Definition India's foreignpolicy approach that gives priority to building strong, stable, and cooperative relations with its immediate South Asian neighbours. Key points It prioritises India's immediate neighbours: Bangladesh, Bhutan, Nepal, Sri Lanka, the Maldives, Pakistan, Afghanist
Nuclear NonProliferation Treaty (NPT) Definition A multilateral treaty intended to prevent the spread of nuclear weapons and weapons technology, to promote cooperation in peaceful uses of nuclear energy, and to advance nuclear disarmament. Key points It was opened for signature in 1968 and entered into force in
Nuclear Suppliers Group (NSG) Definition A group of nuclearsupplier countries that seeks to prevent nuclear proliferation by controlling the export of materials, equipment, and technology that can be used to make nuclear weapons. Key points It was set up in 1974 in response to India's first nuclear test (the 197
Principle of NonRefoulement Definition A principle of international refugee and humanrights law that prohibits a State from returning a refugee or asylumseeker to a country where they face a serious risk of persecution, torture, or other irreparable harm. Key points It is the cornerstone of the 1951 Refugee Conv
Quad (Quadrilateral Security Dialogue) Definition An informal strategic grouping of four democracies, India, the United States, Japan, and Australia, that cooperate on a free, open, and inclusive IndoPacific. Key points The grouping has its roots in coordination after the 2004 Indian Ocean tsunami; it was formal
SAGAR Doctrine Definition India's maritime vision for the Indian Ocean region, "Security and Growth for All in the Region" (SAGAR), articulated in 2015, aimed at cooperative maritime security and sustainable development among littoral States. Key points The acronym SAGAR stands for "Security and Growth for All i
Shanghai Cooperation Organisation (SCO) Definition A Eurasian political, economic, and security organisation founded in 2001, focused on regional stability, counterterrorism, and cooperation among its member states. Key points Founded in 2001 in Shanghai; it grew out of the earlier "Shanghai Five" grouping. Chin
TwoplusTwo (2+2) Dialogue Definition A format of bilateral talks in which the foreign and defence ministers of two countries meet their counterparts together, combining diplomatic and strategicdefence dimensions in a single highlevel dialogue. Key points "Twoplustwo" refers to the two ministers from each side: t
United Nations System Definition The international organisation founded in 1945 to maintain international peace and security, promote cooperation and human rights, and its network of principal organs and specialised agencies. Key points The UN was established on 24 October 1945 under the UN Charter; its headquar
Wassenaar Arrangement Definition A multilateral exportcontrol regime that promotes transparency and responsibility in transfers of conventional arms and dualuse goods and technologies, to prevent destabilising accumulations. Key points It was established in 1996, succeeding the Cold Warera COCOM, and is named af
Aeolian (Desert / Wind) Landforms Definition Landforms created by the erosional and depositional work of wind, dominant in hot deserts and other dry, sparsely vegetated regions; "aeolian" refers to Aeolus, the Greek god of wind. Key points Wind erodes by deflation (lifting and removing loose particles) and abras
Alluvial Soil Definition Fertile soil deposited by rivers as they slow down and drop their sediment, the most widespread and agriculturally important soil in India, covering the northern plains and the coastal and delta regions. Key points The most widespread soil type in India, covering about twofifths of the l
Atmospheric Pressure Belts Definition The broadly latitudinal bands of high and low atmospheric pressure that girdle the Earth, set up by the unequal heating of the surface and by the rotation of the Earth, and which govern the planetary wind system. Key points Four main belts in each hemisphere, from the equato
Biomes and the Biosphere Definition The biosphere is the zone of the Earth where life exists; a biome is a large regional community of plants and animals adapted to a particular climate, such as a tropical rainforest or a desert. Key points The major terrestrial biomes, broadly from equator to pole, are tropical
Biosphere Reserves Definition Biosphere reserves are large protected areas of land and coast that conserve representative ecosystems while allowing sustainable use by local communities, designated nationally and many recognised internationally under UNESCO's Man and the Biosphere (MAB) Programme. Key points A bi
Black Cotton Soil (Regur) Definition A dark, clayey, moistureretentive soil of the Deccan, also called regur, formed from the weathering of basaltic lava (the Deccan Trap) and ideal for growing cotton. Key points Formed by the weathering of basaltic (volcanic) rock of the Deccan Trap; found mainly in Maharashtra
Coalfields of India Definition The regions where India's coal is mined, dominated by the Gondwana coalfields of eastern and central India, which supply the bulk of the country's energy and steel industry. Key points About 95 to 98 per cent of India's coal is Gondwana coal (around 250 million years old), found in
Coastal Plains of India Definition The narrow lowland strips that fringe the Peninsular plateau on the west and east, lying between the Ghats and the sea, divided into the Western and Eastern Coastal Plains. Key points The Western Coastal Plain runs from Gujarat to Kerala between the Western Ghats and the Arabia
Continental Drift Definition The theory, proposed by Alfred Wegener in 1912, that the present continents were once joined in a single supercontinent and have since slowly drifted apart to their current positions. Key points Wegener proposed a single supercontinent, Pangaea, surrounded by a single ocean, Panthala
Coral Reefs Definition Underwater structures built from calcium carbonate secreted by colonies of tiny marine animals called coral polyps, found in warm, shallow, clear tropical seas. Key points Grow best in warm (about 20 to 25 degrees Celsius), shallow, clear, salty, sunlit waters between roughly 30 degrees no
Coriolis Effect (Coriolis Force) Definition The apparent deflection of moving objects, including winds and ocean currents, caused by the rotation of the Earth: to the right in the Northern Hemisphere and to the left in the Southern Hemisphere. Key points Named after the French scientist GaspardGustave de Corioli
Cropping Seasons (Kharif, Rabi, Zaid) Definition The three agricultural seasons of India, defined by the monsoon and temperature cycle: the monsoonsown kharif, the wintersown rabi, and the short summer zaid season. Key points Kharif: sown with the onset of the southwest monsoon (roughly JuneJuly) and harvested i
Cyclone Naming Definition The system by which tropical cyclones are given short, distinctive names so that warnings reach the public clearly and there is no confusion when more than one storm is active in a region. Key points Naming is coordinated regionally; for the North Indian Ocean (Bay of Bengal and Arabian
Deccan Traps Definition A vast region of layered basaltic lava flows in westcentral India, formed by massive volcanic eruptions near the end of the Cretaceous, that gives the Deccan its stepped topography and black cotton soil. Key points Formed by enormous fissure (flood) eruptions of fluid basaltic lava about
Demographic Transition Definition The Demographic Transition Model describes the typical shift of a population, as a country develops, from high birth and death rates to low birth and death rates, passing through recognisable stages of population growth. Key points Stage 1 (high stationary): high birth rate and
Doab Definition The tongue of alluvial land lying between two converging rivers, from the Persian "do" (two) and "ab" (water); a recurring landform of the northern plains. Key points Literally means "two waters"; a doab is the fertile alluvial land enclosed between two rivers before they join. The most famous i
Doldrums and Horse Latitudes Definition Two belts of calm, light, and variable winds in the global pressure system: the doldrums near the equator and the horse latitudes near the subtropical highs at about 30 degrees north and south. Key points The doldrums lie along the equatorial lowpressure belt (the equatori
Duns, Bhabar and Terai Definition Three Himalayan and subHimalayan landforms: duns are flat valleys within the Shiwalik foothills, while bhabar and terai are the gravelly and marshy belts where the hills meet the plains. Key points Duns (or doons) are longitudinal flatfloored valleys lying between the lesser Him
Earthquake Waves (Seismic Waves) Definition The vibrations released from the focus of an earthquake that travel through and around the Earth; their study reveals both ground shaking and the layered structure of the Earth's interior. Key points Body waves travel through the interior: Pwaves (primary, longitudinal
Eastern Ghats Definition The discontinuous, eroded hill ranges along the eastern edge of the Peninsular plateau, running roughly parallel to India's east coast and broken by the major eastflowing rivers. Key points Run along the eastern margin of the Deccan plateau from Odisha through Andhra Pradesh, Telangana,
El Nino and La Nina Definition The two opposite phases of an oceanatmosphere cycle in the equatorial Pacific, El Nino (warming) and La Nina (cooling), that together with the Southern Oscillation (ENSO) affect global and Indian weather. Key points El Nino: abnormal warming of the central and eastern Pacific (off
El Nino Southern Oscillation (ENSO) Definition The El Nino Southern Oscillation (ENSO) is the coupled oceanatmosphere phenomenon over the tropical Pacific in which seasurface temperatures (the El Nino and La Nina ocean part) and the airpressure seesaw between the eastern and western Pacific (the Southern Oscillation
Equatorial Rainforest Definition The dense, evergreen tropical forest of the hot, wet equatorial belt, found near the Equator where high temperatures and heavy rainfall occur throughout the year. Key points Occurs roughly within 5 to 10 degrees of the Equator: the Amazon basin (South America), the Congo basin (A
Erosion and Deposition Definition Erosion is the wearing away and removal of rock and soil by moving agents (rivers, glaciers, wind, waves, and groundwater); deposition is the laying down of that transported material when the agent loses energy. Key points The main agents of erosion are running water (rivers), g
Faults, Block Mountains and Rift Valleys Definition Landforms produced when the crust fractures along a fault and blocks of rock move up or down relative to one another, raising horsts (block mountains) and dropping grabens (rift valleys). Key points A fault is a fracture along which displacement occurs; tension
Fluvial (River) Landforms Definition Landforms created by the erosion, transport, and deposition of running water along the course of a river, from its mountain source to its mouth at the sea. Key points Upper (youthful) course, dominated by erosion: Vshaped valleys, gorges and canyons, waterfalls, rapids, and p
Fold Mountains Definition Mountains formed when horizontal compressive forces, usually at convergent plate boundaries, buckle and crumple layers of sedimentary rock into a series of upfolds and downfolds. Key points An upfold is an anticline (arch) and a downfold is a syncline (trough); the layers were originall
Glacial Landforms Definition Landforms produced by the erosion and deposition of moving ice (glaciers), found in high mountains and in formerly icecovered regions. Key points Erosional features: Ushaped (trough) valleys, cirques (armchair hollows, called corries), aretes (sharp ridges between cirques), horns (py
Glaciers of India Definition Glaciers are large, slowmoving masses of ice formed where snowfall exceeds melting over many years; India's glaciers lie in the high Himalayas and Karakoram and feed its major perennial rivers. Key points The Siachen Glacier in the Karakoram (eastern Karakoram, Ladakh) is one of the
Golden Quadrilateral Definition A network of fourtosixlane national highways connecting India's four largest metropolitan cities, Delhi, Mumbai, Chennai, and Kolkata, the central element of the National Highways Development Project. Key points Links Delhi, Mumbai, Chennai, and Kolkata in a quadrilateral of highs
Great Barrier Reef Definition The world's largest coral reef system, lying in the Coral Sea off the northeastern coast of Queensland, Australia, and a UNESCO World Heritage Site. Key points The largest living structure on Earth and the largest coral reef system, stretching over about 2,300 km off the Queensland
Green Revolution Definition The sharp rise in Indian foodgrain production from the mid1960s, achieved through highyieldingvariety seeds, chemical fertilisers, assured irrigation, and modern inputs, which made India selfsufficient in cereals. Key points Began in the mid1960s in response to severe food shortages a
Himalayan vs Peninsular Rivers Definition The two great river systems of India, classified by source and behaviour: the snowfed, perennial Himalayan rivers and the rainfed, mostly seasonal Peninsular rivers. Key points Himalayan rivers (Indus, Ganga, Brahmaputra systems) are perennial, fed by both monsoon rain a
Humidity and Condensation Definition Humidity is the amount of water vapour in the air; condensation is the change of that vapour back into liquid (or ice) when air is cooled to its dew point, producing dew, fog, mist, clouds, and precipitation. Key points Absolute humidity is the actual mass of water vapour per
Indian Desert (Thar) Definition The Thar or Great Indian Desert, an arid sandy region in the northwest of India lying largely in western Rajasthan, west of the Aravalli Range. Key points Lies mainly in Rajasthan and extends into Gujarat, Punjab, and Haryana, and across the border into Pakistan; it is the world's
Indian Ocean Dipole Definition An oceanatmosphere oscillation in the tropical Indian Ocean, sometimes called the "Indian Nino," defined by the difference in seasurface temperature between its western (Arabian Sea) and eastern (near Indonesia) parts. Key points A positive IOD has warmerthannormal water in the wes
Indian Standard Meridian Definition The Indian Standard Meridian is the line of longitude 82 degrees 30 minutes east, whose local time is taken as the standard time for the whole country (Indian Standard Time, IST), to avoid the confusion of many local times across India's eastwest spread. Key points The standar
IndoGangetic Plain (Northern Plains) Definition The vast, flat, fertile alluvial lowland of northern India formed by the deposition of sediment by the Indus, Ganga, and Brahmaputra river systems between the Himalayas and the Peninsular plateau. Key points Built up over millions of years by alluvium deposited by
Inland Drainage Definition Inland (endorheic) drainage is a system in which rivers do not reach the sea but end in an inland lake, a salt flat, or simply disappear into the desert sand, in contrast to exorheic drainage that flows to the ocean. Key points A basin with no outlet to the sea is called an endorheic o
Insolation and the Heat Budget Definition Insolation is the incoming solar radiation received at the Earth's surface; the heat budget is the longterm balance between the solar energy the Earth receives and the energy it radiates back to space, which keeps global temperature broadly stable. Key points Insolation
Interior of the Earth Definition The layered internal structure of the Earth, inferred chiefly from the behaviour of earthquake (seismic) waves, comprising the crust, the mantle, and the core. Key points The crust is the thin outermost solid shell: thicker continental crust (sial, granitic, silicaandaluminium ri
Iron Ore Belts of India Definition The major regions where India's highgrade iron ore is mined, concentrated in the Peninsular plateau States and supplying the country's iron and steel industry. Key points India has large reserves of iron ore, mostly haematite (high iron content) and magnetite; ore is found chie
Isohyet, Isobar and Isotherm Definition "Iso" lines are lines on a map joining places of equal value: isohyets join equal rainfall, isobars join equal atmospheric pressure, and isotherms join equal temperature. Key points "Iso" is Greek for "equal"; an isoline (or isopleth) connects points of the same value of s
Isostasy Definition The state of gravitational balance in which the lighter crust (sial) floats on the denser, semifluid mantle below (sima), so that high landmasses are compensated by deep "roots" much as an iceberg floats with most of its mass underwater. Key points The term was coined by the American geologis
Jet Streams Definition Narrow belts of very fast, highaltitude winds in the upper troposphere that flow generally from west to east and steer weather systems. Key points Found in the upper troposphere (about 9 to 12 km up); blow west to east at speeds often exceeding 100 km per hour. Major types: the polar jet
Karst Landforms Definition Landforms produced by the chemical weathering (carbonation) and solution of soluble rocks, chiefly limestone, by slightly acidic water; named after the Karst region of the Balkans. Key points Surface features include sinkholes (dolines), swallow holes, lapies (grooved rock surfaces), a
Koppen Climate Classification Definition An empirical scheme devised by Wladimir Koppen (1918) that divides world climates using mean monthly temperature, mean monthly rainfall, and natural vegetation, expressed in a code of capital and small letters. Key points Five major groups by capital letter: A (tropical,
Lakes of India Definition Lakes are inland bodies of standing water, classified by origin (tectonic, glacial, volcanic, oxbow, lagoon, or artificial) and by water type (freshwater or saltwater); India has lakes of many of these kinds. Key points Saltwater lakes: Sambhar (Rajasthan, India's largest inland salt la
Laterite Soil Definition A reddish, iron and aluminium rich soil formed by intense leaching in regions of high temperature and heavy seasonal rainfall, typically infertile but hardening into a useful building material. Key points Forms under hot, humid climates with alternating wet and dry seasons, where heavy r
Latitudes and Longitudes Definition The grid of imaginary lines used to locate any point on Earth: latitudes (parallels) measure distance north or south of the Equator, and longitudes (meridians) measure distance east or west of the Prime Meridian. Key points Latitudes run east to west and are parallel; they ran
Layers of the Atmosphere Definition The vertical structure of the Earth's atmosphere, divided into layers by how temperature changes with height: the troposphere, stratosphere, mesosphere, thermosphere, and exosphere. Key points Troposphere (surface to about 8 to 18 km, lowest at the poles, highest at the equato
Line of Control versus International Border Definition The distinction between the Line of Control (LoC), a military control line between India and Pakistan in Jammu and Kashmir, and the International Border (IB), the legally recognised and demarcated boundary between the two countries in the plains. Key points
LoC versus LAC Definition The Line of Control (LoC) is the military control line between India and Pakistan in Jammu and Kashmir, while the Line of Actual Control (LAC) is the loosely defined demarcation between Indiancontrolled territory and Chinesecontrolled territory. Key points The LoC runs about 740 km in J
Local and Seasonal Winds Definition Winds that blow over a small area or for part of the year, set up by local differences in heating and pressure, as distinct from the permanent planetary winds; they include periodic breezes and named local winds. Key points Land and sea breezes are periodic and daily: by day t
Major Ports of India Definition The large seaports of India designated as "major ports" under the central government (administered through the Major Port Authorities Act, 2021), as distinct from the many smaller "minor" or nonmajor ports run by state maritime boards. Key points India has twelve operational major
Mangroves Definition Mangroves are salttolerant (halophytic) trees and shrubs that grow in the intertidal zones of sheltered tropical and subtropical coasts, estuaries, and deltas, forming dense tidal forests in brackish water. Key points They have special adaptations to waterlogged, saline, oxygenpoor mud: stil
Mediterranean Climate Definition A warm temperate climate of the western margins of continents between about 30 and 45 degrees latitude, marked by hot, dry summers and mild, wet winters. Key points Found on the western sides of continents in the subtropics: the lands around the Mediterranean Sea, central Califor
Mineral Belts of India Definition The broad regions of India where metallic and nonmetallic minerals are concentrated, largely in the old, hard rocks of the Peninsular plateau, recognised as several distinct mineral belts. Key points The NorthEastern Plateau belt (Chhota Nagpur, covering Jharkhand, Odisha, West
Monsoon Definition The seasonal reversal of wind direction over the Indian subcontinent, driven by the differential heating of land and sea, which brings India most of its annual rainfall. Key points Caused by the differential heating of the Asian landmass and the surrounding oceans, reversing the winds seasonal
Mountain Passes of India Definition Mountain passes are natural gaps or low points in a mountain range that allow movement of people, goods, and armies across the barrier; India's Himalayan and other passes carry both trade and strategic significance. Key points Jammu and Kashmir and Ladakh: Zoji La (links Srina
Multipurpose River Valley Projects Definition Large damandreservoir schemes designed to serve several purposes at once, such as irrigation, hydroelectric power, flood control, water supply, navigation, and recreation, called by Nehru the "temples of modern India". Key points A single project serves multiple obje
Nuclear Power Plants of India Definition The operating nuclear power stations of India, run mainly by the Nuclear Power Corporation of India Limited (NPCIL), which use controlled nuclear fission to generate electricity, located by state and coast for siting reasons. Key points Tarapur (Maharashtra) was India's f
Ocean Currents Definition Largescale, continuous movements of ocean water in definite directions, driven mainly by prevailing winds, differences in water density, and the Earth's rotation, and classified as warm or cold. Key points Caused by planetary winds, the Coriolis force, temperature and salinity differenc
Ocean Salinity Definition The total quantity of dissolved salts in sea water, normally expressed in parts per thousand (ppt or per mille); the average salinity of the world ocean is about 35 parts per thousand. Key points Salinity is raised by high evaporation and lowered by high rainfall, river inflow of fresh
Ocean Temperature and the Thermocline Definition The vertical and horizontal distribution of temperature in the oceans, in which a warm sunlit surface layer overlies a zone of rapid temperature decline (the thermocline) and then a uniformly cold deep layer. Key points The ocean has three thermal layers: a warm,
Peninsular Block Definition The ancient, rigid landmass of southern India, a fragment of Gondwana made of Precambrian crystalline rocks, that acted as a stable foreland against which the Himalayas were folded. Key points A part of the old Gondwana supercontinent; it is a craton (a stable continental block) of Ar
Peninsular Plateau Definition The large, ancient tableland that forms the core of southern India, made of old igneous and metamorphic rocks, the oldest and most stable landmass in the country. Key points One of the oldest landmasses on Earth, a part of the former Gondwana, geologically stable (a craton) and not
Planetary (Prevailing) Winds Definition The permanent, largescale winds that blow steadily across the globe from the highpressure belts toward the lowpressure belts, deflected by the Earth's rotation; the trade winds, the westerlies, and the polar easterlies. Key points Trade winds blow from the subtropical high
Plate Tectonics Definition The theory that the Earth's lithosphere is divided into large rigid plates that move over the semifluid asthenosphere, and whose interactions cause earthquakes, volcanoes, and mountain building. Key points The lithosphere is broken into major and minor plates that move a few centimetre
Ramsar Wetlands Definition Ramsar sites are wetlands of international importance designated under the Ramsar Convention, an intergovernmental treaty for the conservation and wise use of wetlands signed in Ramsar, Iran, in 1971. Key points Wetlands are areas of marsh, fen, peatland, or water, natural or artificia
Red Soil Definition A reddish soil formed by the weathering of old crystalline and metamorphic rocks in the lowrainfall areas of the Peninsular plateau, owing its colour to iron oxide. Key points Develops on the ancient crystalline and metamorphic rocks of the Peninsula in areas of relatively low rainfall, espec
Rock Cycle and Rock Types Definition The continuous transformation of rock from one type to another, in which igneous, sedimentary, and metamorphic rocks are formed, broken down, and reformed through melting, weathering, deposition, and heatandpressure. Key points Igneous rocks form from cooled magma or lava; in
Soil Erosion and Conservation Definition Soil erosion is the removal of fertile topsoil by water, wind, or human action faster than it forms; soil conservation is the set of practices that slow this loss and maintain soil fertility. Key points Water erosion takes forms of increasing severity: sheet erosion (unif
Soil Formation (Pedogenesis) Definition The natural process by which weathered rock (regolith) combines with organic matter, water, air, and living organisms to form soil, a layered body that supports plant life. Key points The classic five soilforming factors are parent material, climate, relief (topography), l
Temperature Inversion Definition A reversal of the normal pattern in the troposphere, where temperature, instead of falling with height, increases with height, so that a layer of warmer air sits above colder air near the surface. Key points Normally temperature falls with altitude at the environmental lapse rate
The Himalayas Definition The young fold mountain system along India's northern border, formed by the collision of the Indian and Eurasian plates, and the world's highest mountain range. Key points Formed by convergent collision; geologically young, structurally fold mountains, and still rising, which makes the r
Tides Definition The regular rise and fall of sea level, caused mainly by the gravitational pull of the Moon and the Sun on the ocean waters, combined with the centrifugal effect of the EarthMoon system. Key points The Moon's pull is the dominant cause; though far smaller than the Sun, the Moon is much closer, s
Tiger Reserves Definition Tiger reserves are protected areas notified under Project Tiger and the Wildlife (Protection) Act to conserve the Bengal tiger and its habitat, administered by the National Tiger Conservation Authority (NTCA). Key points Project Tiger was launched in 1973; the first nine reserves includ
Tropical Cyclones Definition Intense, rotating lowpressure storm systems that form over warm tropical oceans, bringing violent winds, heavy rain, and storm surges; called cyclones in the Indian Ocean. Key points Need warm seasurface temperatures (above about 26 to 27 degrees Celsius), high humidity, the Coriolis
Tropical Monsoon Climate Definition A tropical climate marked by a seasonal reversal of winds and a sharp wetanddry rhythm, with a hot rainy season and a dry season, typical of the Indian subcontinent and much of South and SouthEast Asia. Key points Found in South Asia (India, Bangladesh, Myanmar, Sri Lanka), So
Tsunami Definition A series of very long, fast ocean waves generated by the sudden displacement of a large body of water, most often by an undersea earthquake, but also by submarine landslides or volcanic eruptions; the word is Japanese for "harbour wave." Key points The most common trigger is a strong, shallow
Tundra and Taiga Definition The two cold highlatitude biomes of the Northern Hemisphere: the treeless tundra of the Arctic margins and the taiga (boreal coniferous forest) lying just to its south. Key points Tundra lies along the Arctic fringe of North America, Europe, and Asia (and on high mountains as alpine t
Types of Clouds Definition Clouds are visible masses of tiny water droplets or ice crystals suspended in the atmosphere, formed when moist air rises, cools below its dew point, and condenses around dust or salt particles (condensation nuclei). Key points The standard classification (after Luke Howard) uses Latin
Types of Coral Reefs Definition The three classic forms of coral reef, distinguished by their position relative to the coast and the presence of a lagoon, first explained in a single subsidence theory by Charles Darwin. Key points Fringing reef: grows directly along and attached to the shore (or with only a very
Types of Farming Definition Farming systems classified by intensity, purpose, and inputs, ranging from lowinput subsistence agriculture for the farmer's own use to highinput commercial agriculture for the market. Key points Subsistence farming is grown mainly for the family; primitive (shifting) subsistence such
Types of Rainfall Definition The three principal mechanisms by which moist air is lifted, cooled to its dew point, and made to release precipitation: convectional, orographic (relief), and cyclonic (frontal) rainfall. Key points Convectional rainfall: intense surface heating makes air rise, cool, and condense; g
Types of Rocks Definition Rocks are natural aggregates of one or more minerals making up the Earth's crust, classified by their mode of formation into three families: igneous, sedimentary, and metamorphic. Key points Igneous rocks form by the cooling and solidification of molten magma or lava; intrusive (plutoni
Types of Volcanoes Definition Volcanoes are openings in the Earth's crust through which magma, gases, and ash erupt, classified by the shape of the cone, the nature of the lava (viscous or runny), and the style of eruption. Key points By activity: active (erupting or likely to erupt, like Etna), dormant (quiet b
Volcanic Hotspots Definition Hotspots are fixed plumes of unusually hot mantle material that rise toward the surface and feed volcanoes in the interior of a tectonic plate, away from the usual plate boundaries where most volcanism occurs. Key points The mantle plume stays roughly stationary while the plate drift
Volcanic Landforms Definition Landforms built by volcanic activity, formed both above the surface (extrusive) by lava and ash, and below it (intrusive) by magma that cools and solidifies within the crust. Key points Extrusive (volcanic) features include shield volcanoes (broad, gentle, from runny basaltic lava,
Watershed Management Definition A watershed is the entire area of land that drains into a common stream, river, or water body; watershed management is the planned use and conservation of land, water, and vegetation within that drainage unit to maximise water retention and soil health. Key points The watershed (a
Weathering Definition The breakdown and decay of rocks in situ (in place) at or near the Earth's surface by physical, chemical, and biological action, without largescale transport of the broken material. Key points Physical (mechanical) weathering disintegrates rock without changing its chemistry: frost action (
Western Disturbances Definition Extratropical (midlatitude) lowpressure storm systems that originate over the Mediterranean and Caspian Sea region and travel eastward, steered by the subtropical westerly jet stream, to bring winter rain and snow to northwest India. Key points They are nonmonsoonal: they bring ra
Western Ghats Definition The continuous range of hills running parallel to India's western coast, also called the Sahyadris, a UNESCO World Heritage Site and a global biodiversity hotspot. Key points Run roughly 1,600 km from the Tapi river in the north to near Kanyakumari, through Maharashtra, Goa, Karnataka, K
White Revolution (Operation Flood) Definition The transformation of India into the world's largest milk producer through Operation Flood, a dairy cooperative programme launched in 1970 that linked rural milk producers to urban markets. Key points Operation Flood was launched in 1970 by the National Dairy Develop
Alvars and Nayanars Definition The two groups of Tamil devotional (Bhakti) saintpoets of South India between roughly the 6th and 9th centuries CE, the Alvars devoted to Vishnu and the Nayanars devoted to Shiva, who launched the early Bhakti movement. Key points Alvars: twelve Vaishnava saints (devotees of Vishnu
Ashokan Edicts Definition The inscriptions of the Mauryan emperor Ashoka (reigned about 268 to 232 BCE), carved on rocks, pillars, and cave walls, that proclaim his policy of Dhamma (moral law) after the Kalinga war. Key points Mostly in Prakrit language and Brahmi script; the northwest edicts use Kharosthi, and
Ashokan Pillars and Edicts (Structure) Definition The monolithic polished sandstone pillars and the inscribed proclamations (edicts) of Ashoka, the main royal source for Mauryan history and the spread of Dhamma, classified by where they are carved and how many. Key points The pillars are single shafts of Chunar
Ashtadhyayi of Panini Definition The earliest surviving grammar of Sanskrit, composed by the grammarian Panini around the 5th to 4th century BCE, a systematic treatise of nearly 4,000 rules (sutras) in eight chapters (adhyayas). Key points The name means "eight chapters"; it codified the rules of classical Sansk
Ashtadiggajas Definition The eight celebrated Telugu poets (literally the eight elephants of the directions) who adorned the court of the Vijayanagara emperor Krishnadevaraya (reigned 1509 to 1529), during a golden age of Telugu literature. Key points Krishnadevaraya, himself a scholarpoet, patronised Telugu and
August Offer, 1940 Definition A set of proposals made by Viceroy Lord Linlithgow in August 1940, during the Second World War, offering Indians a greater role in the war effort and postwar constitutional change in return for cooperation. Key points Announced in August 1940 to win Indian support for the British wa
Bahmani Kingdom Definition A Muslim kingdom of the Deccan (1347 to 1527) founded by Alauddin Hasan Bahman Shah after a revolt against the Tughlaqs, the chief rival of the Vijayanagara Empire south of the Tungabhadra. Key points Founded in 1347 by Alauddin Hasan Bahman Shah (also called Hasan Gangu), with its fir
Bhakti Movement Definition A medieval devotional movement (roughly 7th to 17th centuries) that stressed personal devotion (bhakti) to a single God, rejected ritualism, caste hierarchy, and priestly intermediaries, and used regional languages. Key points Began in South India with the Alvars (devotees of Vishnu) a
Buddhism Definition A religion and philosophy founded by Gautama Buddha (Siddhartha) in the 6th century BCE, teaching the Four Noble Truths and the Eightfold Path as the way to end suffering and attain nirvana. Key points Gautama Buddha (about 563 to 483 BCE) was born at Lumbini (in Nepal), attained enlightenmen
Cabinet Mission Plan, 1946 Definition A threemember British mission sent in 1946 to negotiate the transfer of power, which proposed a loose federal union of India with grouping of provinces and rejected the demand for a fully separate, sovereign Pakistan. Key points Comprised three British cabinet ministers: Lor
Charter Act, 1813 Definition A British law that renewed the East India Company's charter for twenty years while ending its trade monopoly in India (except for tea and trade with China), and asserting Crown sovereignty over Company territories. Key points Ended the Company's monopoly over Indian trade, throwing i
Charter Act, 1833 Definition A British law that made the GovernorGeneral of Bengal the GovernorGeneral of India with full legislative and administrative authority over all of British India, marking the final step in centralisation. Key points Made the GovernorGeneral of Bengal the GovernorGeneral of India; Lord
Charter Act, 1853 Definition The last of the East India Company's charter renewals, which separated legislative and executive functions of the GovernorGeneral's Council and introduced open competition for the civil service. Key points Separated the legislative and executive functions of the GovernorGeneral's Cou
Chola Administration and Local SelfGovernment Definition The administrative system of the imperial Cholas of South India (about 9th to 13th centuries CE), noted especially for its developed system of village selfgovernment described in inscriptions at Uttaramerur. Key points Major rulers: Rajaraja I (built the B
Chola Bronze Sculpture Definition The school of metal images cast under the Chola dynasty (roughly 9th to 13th centuries CE) in south India using the lostwax (cire perdue) technique, regarded as the high point of Indian bronze art. Key points Made by the lostwax method: a wax model is coated in clay, the wax is
Civil Disobedience Movement Definition The mass movement led by Mahatma Gandhi from 1930, based on the active and deliberate breaking of specific British laws, beginning with the salt law. Key points Launched with the Dandi March (Salt Satyagraha), 12 March to 6 April 1930, from Sabarmati Ashram to Dandi, where
Classical Sanskrit Literature Definition The body of secular and courtly Sanskrit writing (kavya, drama and prose) that flourished mainly from the Gupta age onward, distinct from the earlier Vedic and epic literature, and a marker of the socalled classical golden age. Key points Kalidasa (Gupta court): the great
Communal Award, 1932 Definition The scheme announced by British Prime Minister Ramsay MacDonald in 1932 that extended separate electorates to various communities, including, for the first time, the Depressed Classes. Key points Announced on 16 August 1932 by Ramsay MacDonald, following the failure of the Second
Cripps Mission, 1942 Definition A British mission led by Sir Stafford Cripps, sent to India in 1942 during the Second World War to secure Indian cooperation by offering postwar Dominion Status, which the Congress and the Muslim League both rejected. Key points Sent in March 1942 amid wartime pressure, especially
Dandi March (Salt Satyagraha) Definition The march led by Mahatma Gandhi in 1930 from Sabarmati Ashram to the coastal village of Dandi to make salt in defiance of the British salt law, marking the start of the Civil Disobedience Movement. Key points Began on 12 March 1930 from Sabarmati Ashram (near Ahmedabad) w
DiniIlahi Definition A syncretic ethical order or path (literally Divine Faith) proclaimed by the Mughal emperor Akbar in 1582, drawing virtues from several religions, intended to promote tolerance and loyalty rather than to found a mass religion. Key points It grew out of Akbar's religious discussions held in t
Doctrine of Lapse Definition An annexation policy applied by Lord Dalhousie (GovernorGeneral, 1848 to 1856) under which a princely state would "lapse" to the British if its ruler died without a natural heir, with adopted heirs not recognised. Key points Used to annex Satara (1848, the first), Jaitpur, Sambalpur,
Eight Classical Dances of India Definition The eight dance forms recognised by the Sangeet Natak Akademi as classical Indian dance, each rooted in the Natya Shastra of Bharata Muni and associated with a particular state or region. Key points Bharatanatyam: Tamil Nadu; the oldest, derived from the temple dance of
Folk and Tribal Dances of India Definition The regional and community dance forms of India that lie outside the eight recognised classical traditions, performed at festivals, harvests and rituals, and strongly tied to particular states. Key points Punjab: Bhangra (harvest, male) and Giddha (female). Gujarat: Ga
Foreign Invasions of the PostMauryan Age Definition The succession of Central Asian and West Asian peoples who entered northwestern India through the Hindu Kush passes after the Mauryan decline, in the order IndoGreeks, Shakas, Parthians (Pahlavas) and Kushanas. Key points The usual sequence is IndoGreeks (Bactr
Formation of the Indian National Congress Definition The founding in 1885 of the Indian National Congress, the first allIndia political organisation, which became the principal vehicle of the Indian freedom struggle. Key points Founded in December 1885 at Bombay (the session was held at Gokuldas Tejpal Sanskrit
Four Buddhist Councils Definition The four major assemblies (sangitis) of Buddhist monks held after the Buddha's death to compile his teachings and resolve doctrinal disputes, each tied to a king and a place. Key points First council: at Rajgir (Rajagriha), under Ajatashatru, presided by Mahakassapa, soon after
Four Noble Truths and the Eightfold Path Definition The central ethical teaching of Buddhism: the Four Noble Truths (Arya Satyas) that diagnose suffering and its cure, and the Eightfold Path (Ashtangika Marga) that prescribes the practical way to end suffering and reach nirvana. Key points The Four Noble Truths:
Gandhara and Mathura Art Definition Two major schools of sculpture that flourished in the postMauryan and Kushana period (around the 1st to 4th centuries CE) and produced some of the earliest images of the Buddha in human form. Key points Gandhara school: centred in the northwest (the Peshawar region and Afghani
GandhiIrwin Pact, 1931 Definition An agreement signed in March 1931 between Mahatma Gandhi and Viceroy Lord Irwin under which the Civil Disobedience Movement was suspended and the Congress agreed to attend the Second Round Table Conference. Key points Signed on 5 March 1931, also called the Delhi Pact, after tal
Government of India Act, 1858 Definition The law that transferred the government of India from the East India Company to the British Crown after the Revolt of 1857, ending Company rule and beginning direct Crown rule. Key points Abolished the East India Company and transferred the powers of government, territori
Government of India Act, 1935 Definition The last major constitutional law for British India, which introduced provincial autonomy and proposed an AllIndia Federation, and which served as a key source for the Constitution of India. Key points Provided for an AllIndia Federation of British provinces and princely
Gupta Golden Age Definition The period of the Gupta Empire (about 320 to 550 CE), often called the classical or golden age of ancient India for its achievements in science, mathematics, art, literature, and administration. Key points Major rulers: Chandragupta I (founder, Gupta era from 319 to 320 CE), Samudragu
Harappan Civilisation Definition India's earliest urban (Bronze Age) civilisation, also called the Indus Valley Civilisation, that flourished mature from about 2600 to 1900 BCE across the Indus and Saraswati (GhaggarHakra) basins. Key points First discovered through excavations at Harappa (1921, Daya Ram Sahni)
Harappan Major Sites Definition The principal excavated cities and towns of the Indus Valley (Harappan) Civilisation, each associated with a river, a modern country or state, and a signature find. Key points Harappa (Punjab, Pakistan, river Ravi): the first site excavated (1921, Daya Ram Sahni); six granaries an
Harappan Town Planning Definition The systematic urban layout of the mature Harappan cities (about 2600 to 1900 BCE), marked by a grid pattern, an upper citadel and a lower town, standardised bricks and an advanced drainage system, the hallmark of India's first urbanisation. Key points Cities had two parts: a ra
Harshavardhana's Empire Definition The North Indian empire of Harshavardhana (reigned about 606 to 647 CE) of the Pushyabhuti (Vardhana) dynasty, ruling from Kannauj, the last major empire of ancient northern India before the early medieval period. Key points Harsha shifted his capital to Kannauj and brought muc
Hindustani vs Carnatic Music Definition The two classical traditions of Indian music, the Hindustani system of the north and the Carnatic system of the south, both built on the common framework of raga (melody) and tala (rhythm) but differing in style and patronage history. Key points Common roots: both descend
Home Rule Movement Definition A nationalist agitation launched during the First World War (1916) demanding selfgovernment (Home Rule) for India within the British Empire, modelled on the Irish Home Rule movement. Key points Two Home Rule Leagues were founded: one by Bal Gangadhar Tilak in April 1916 (based in Ma
Ilbert Bill Controversy, 1883 Definition The controversy over a bill introduced in 1883, under Viceroy Lord Ripon, that sought to allow Indian judges to try European defendants in criminal cases, exposing the racial bias in colonial administration. Key points Drafted by Sir Courtenay Ilbert, the Law Member, the
Indian Councils Act, 1861 Definition A British law that began the association of Indians with lawmaking and started the process of decentralisation by restoring legislative powers to the provinces, passed after the Revolt of 1857. Key points For the first time associated Indians with the legislative process: the
Indian Councils Act, 1892 Definition A British law that enlarged the legislative councils, increased the functions of their members, and introduced a limited and indirect elective principle for the first time, though the word "election" was not used. Key points Increased the number of additional (nonofficial) me
Indian Independence Act, 1947 Definition The British Parliamentary law that ended British rule in India, creating the two independent dominions of India and Pakistan with effect from 15 August 1947. Key points Received royal assent on 18 July 1947 and gave legal effect to the Mountbatten Plan of 3 June 1947. En
Indian National Army (Azad Hind Fauj) Definition An armed force of Indian nationalists, raised mainly from Indian prisoners of war and expatriates in Southeast Asia during the Second World War, that fought alongside Japan against the British to free India, reorganised and led by Subhas Chandra Bose. Key points F
IndoGreeks Definition The Greek (Bactrian) rulers who invaded and governed parts of the northwest of the Indian subcontinent from about the 2nd century BCE, the first of the foreign powers (the IndoGreeks, Shakas, Parthians and Kushanas) to enter India after the Mauryas declined. Key points They came from Bactri
IndoIslamic Architecture Definition The style of architecture that developed in India from the 13th century onward under the Delhi Sultanate and the Mughals, blending Islamic features (the arch, dome, and minaret) with indigenous Indian craftsmanship and motifs. Key points Distinctive features include the true a
Iqta System Definition The administrative and revenue system of the Delhi Sultanate under which the Sultan assigned territories (iqtas) to nobles and officers (iqtadars or muqtis) in lieu of cash salary, in return for maintaining troops and remitting surplus revenue to the state. Key points Introduced in India b
Jain Councils Definition The two great assemblies of Jain monks held to collect and preserve the teachings of Mahavira, the second of which produced the final canon of the Svetambara sect. Key points First council: at Pataliputra, around the 3rd century BCE (about 300 BCE), under the leadership of Sthulabhadra;
Jainism Definition An ancient Indian religion that emphasises nonviolence (ahimsa), asceticism, and liberation of the soul, systematised in the 6th century BCE by Vardhamana Mahavira, the twentyfourth and last tirthankara (fordmaker). Key points Mahavira (about 540 to 468 BCE) was born at Kundagrama near Vaishal
Jallianwala Bagh Massacre Definition The mass killing of unarmed civilians by British troops at Jallianwala Bagh, Amritsar, on 13 April 1919, one of the most notorious atrocities of British rule in India. Key points Took place on 13 April 1919 (Baisakhi day) when a large crowd, including women and children, had
Jataka Tales Definition A large body of stories of the previous births (jatis) of the Buddha as a bodhisattva, in human and animal form, part of the Khuddaka Nikaya within the Sutta Pitaka of the Buddhist canon. Key points Each tale shows the bodhisattva practising a moral virtue (such as generosity, patience or
Jizya Definition A tax levied on nonMuslim subjects (dhimmis) under Islamic rule in medieval India in lieu of military service and in return for state protection, a recurring marker of religious policy in the Delhi Sultanate and the Mughal Empire. Key points Collected through the Delhi Sultanate; rulers like Fir
Kushana Empire Definition A Central Asian dynasty (the Kushanas, a branch of the Yuezhi) that ruled over a vast empire across Central Asia and northwestern India in roughly the 1st to 3rd centuries CE, reaching its height under Kanishka. Key points The dynasty was founded by Kujula Kadphises; its greatest ruler
Lucknow Pact, 1916 Definition An agreement reached in 1916 between the Indian National Congress and the Muslim League at their joint sessions in Lucknow, marking a high point of HinduMuslim political unity in the freedom struggle. Key points Signed in 1916 at Lucknow during the joint annual sessions of the Congr
Mansabdari System Definition The grading and ranking system of the Mughal nobility introduced by Akbar, under which every officer (mansabdar) held a numerical rank (mansab) that fixed his status, salary, and the number of troops he had to maintain. Key points Each mansabdar held a dual rank: the zat (personal ra
Market Reforms of Alauddin Khalji Definition The pricecontrol and marketregulation measures introduced by Sultan Alauddin Khalji (reigned 1296 to 1316) of the Khalji dynasty, designed mainly to maintain a large standing army cheaply by fixing the prices of essential goods. Key points He fixed the prices of foodg
Mauryan Administration Definition The centralised bureaucratic system of the Mauryan Empire (about 321 to 185 BCE), described in Kautilya's Arthashastra and in the account of the Greek envoy Megasthenes (the Indica), the most elaborate state machinery of ancient India. Key points Highly centralised monarchy with
Mauryan Art and Pillars Definition The art and architecture of the Mauryan period (about 321 to 185 BCE), best known for Ashoka's monolithic polished stone pillars, rockcut caves, and the early stupas, marking a high point of court (royal) and popular art. Key points Ashokan pillars are monolithic, made of polis
Megalithic Culture Definition The Iron Age culture (roughly 1500 BCE to 300 BCE, mainly peninsular and southern India) marked by burials under or within large stones (megaliths), bridging the late prehistoric and early historic periods. Key points "Megalith" means a monument built of large stones, here used for
Miniature Painting Schools Definition The tradition of small, detailed paintings on paper, cloth or palmleaf that flourished from the medieval period, grouped into the eastern, western, Mughal, Rajput (Rajasthani and Pahari) and Deccan schools. Key points Early miniatures: the eastern Pala school (Buddhist palml
MontaguChelmsford Reforms (Government of India Act, 1919) Definition The constitutional reforms enacted by the Government of India Act, 1919, named after Secretary of State Edwin Montagu and Viceroy Lord Chelmsford, best known for introducing dyarchy in the provinces. Key points Followed the August Declaration o
MorleyMinto Reforms (Indian Councils Act, 1909) Definition The constitutional reforms enacted by the Indian Councils Act of 1909, named after Secretary of State John Morley and Viceroy Lord Minto, best known for introducing separate (communal) electorates for Muslims. Key points Introduced, for the first time, s
Mountbatten Plan, 1947 Definition The plan announced by Viceroy Lord Mountbatten on 3 June 1947 (the "3rd June Plan") that set out the partition of British India into two dominions, India and Pakistan, and led to the Indian Independence Act, 1947. Key points Announced on 3 June 1947 by Lord Mountbatten, the last
Nagara and Dravidian Temple Styles Definition The two principal styles of Hindu temple architecture in India, the Nagara style of the north and the Dravidian style of the south, with a third intermediate Vesara style in the Deccan, all crystallising from the Gupta period onward. Key points Nagara (northern) styl
Nalanda and Takshashila Definition Two of ancient India's most famous centres of learning: Takshashila (Taxila) in the northwest, active from about the 6th century BCE, and Nalanda in Bihar, a residential Buddhist monastic university that flourished from the 5th to the 12th centuries CE. Key points Takshashila w
Navaratnas of Vikramaditya Definition The legendary "nine gems" (navaratnas), nine learned men said by tradition to have adorned the court of a king Vikramaditya, conventionally identified with the Gupta ruler Chandragupta II (whose title was Vikramaditya). Key points The tradition is preserved in a verse from t
Nehru Report, 1928 Definition The first major Indian attempt to draft a constitution for India, prepared by an allparties committee headed by Motilal Nehru in 1928 as a response to the British challenge to produce an agreed constitutional scheme. Key points Drafted by a committee appointed by the All Parties Con
NonCooperation Movement Definition The first nationwide mass movement led by Mahatma Gandhi (1920 to 1922), based on the nonviolent withdrawal of cooperation from British rule. Key points Launched in 1920 (approved at the Nagpur session of the Congress, December 1920); combined with the Khilafat movement over th
Pallava Architecture Definition The early phase of Dravidian temple building under the Pallava dynasty of Kanchipuram (roughly 6th to 9th centuries CE), which moved south Indian architecture from rockcut caves to freestanding structural temples, mainly at Mahabalipuram (Mamallapuram) and Kanchipuram. Key points
Partition of India Definition The division of British India in 1947 into two independent dominions, India and Pakistan, on the basis of religious majority, accompanied by mass migration and communal violence. Key points Carried out under the Mountbatten Plan (3 June 1947) and given legal effect by the Indian Ind
Permanent, Ryotwari and Mahalwari Settlements Definition The three main landrevenue systems introduced by the British in India, which differed in who was recognised as the revenuepayer to the state: the zamindar, the individual cultivator, or the village body. Key points Permanent Settlement (1793): introduced b
Pitt's India Act, 1784 Definition A British law passed under Prime Minister William Pitt the Younger that placed the East India Company's political functions under direct government control while leaving commercial functions with the Company, creating a system of double government. Key points Established a Board
Poona Pact, 1932 Definition An agreement signed in 1932 between Mahatma Gandhi and Dr B.R. Ambedkar that abandoned separate electorates for the Depressed Classes in favour of reserved seats within joint (general) electorates. Key points Arose from the Communal Award (1932) of British Prime Minister Ramsay MacDon
Puranas and Itihasa Tradition Definition The body of Hindu narrative literature outside the Vedas, comprising the two great epics (the Itihasa, namely the Ramayana and the Mahabharata) and the Puranas, a class of mythological and genealogical texts. Key points Itihasa means "thus it happened" and refers to the e
Quit India Movement Definition The final mass movement of the freedom struggle, launched by the Congress in August 1942 demanding an immediate end to British rule, with the slogan "Do or Die". Key points Approved by the Quit India Resolution at the Bombay (Gowalia Tank) session on 8 August 1942; Gandhi gave the
Regulating Act, 1773 Definition The first British Parliamentary law to regulate the affairs of the East India Company in India, marking the beginning of direct British government control over Company administration. Key points Designated the Governor of Bengal as the GovernorGeneral of Bengal, with an Executive
Revolt of 1857 Definition The first major, widespread uprising against British East India Company rule in India, beginning in 1857, also called the First War of Independence or the Sepoy Mutiny. Key points Began with the mutiny of sepoys at Meerut on 10 May 1857, who then marched to Delhi. Immediate trigger: th
Rockcut Architecture Definition The Indian tradition of carving caves, halls, monasteries and temples directly out of living rock rather than building them with cut stones, running from the Mauryas to the early medieval period. Key points Earliest examples are the Barabar and Nagarjuni caves (Bihar), cut for the
Round Table Conferences Definition A series of three conferences held in London (1930 to 1932) between the British government and Indian representatives to discuss constitutional reforms, following the recommendations of the Simon Commission. Key points First Round Table Conference (1930 to 1931): boycotted by t
Rowlatt Act, 1919 Definition A repressive law (the Anarchical and Revolutionary Crimes Act, 1919) that empowered the British government to detain political suspects without trial, provoking the first nationwide agitation led by Gandhi. Key points Based on the recommendations of the Rowlatt Committee, headed by S
Sangam Age (Society and Polity) Definition The early historic period of South India (roughly 300 BCE to 300 CE) named after the Sangam (academy) literature, dominated by three Tamil kingdoms and a flourishing maritime trade with Rome. Key points Three crowned kings (muvendar): the Cheras (capital Vanji, emblem t
Sangam Literature Definition The earliest body of Tamil literature (roughly 300 BCE to 300 CE), composed at assemblies (sangams) of poets said to have been held under the patronage of the Pandya rulers at Madurai, the main source for the Sangam Age of South India. Key points Tradition speaks of three sangams; th
Satavahana Dynasty Definition A Deccan dynasty (the Satavahanas, also called the Andhras) that ruled over the Deccan and central India from about the 1st century BCE to the 3rd century CE, the first major indigenous power to rise after the Mauryas in the south. Key points The dynasty was founded by Simuka; its g
Second Urbanisation Definition The reemergence of towns and cities in the Ganga plain from around the 6th century BCE, the first major urban phase after the decline of the Harappan (Indus Valley) cities, hence called the Second Urbanisation. Key points Occurred in the eastern and middle Gangetic valley, linked t
Simon Commission Definition A statutory commission appointed by the British in 1927 to review the working of the Government of India Act, 1919, and recommend further constitutional reforms; boycotted across India because it had no Indian member. Key points Headed by Sir John Simon, with seven members, all Britis
Six Schools of Indian Philosophy (Shad Darshana) Definition The six orthodox (astika) systems of Hindu philosophy that accept the authority of the Vedas, traditionally grouped into three pairs, as opposed to the heterodox (nastika) schools of Buddhism, Jainism and Charvaka. Key points Samkhya: founded by Kapila;
Sixteen Mahajanapadas Definition The sixteen great states (mahajanapadas) that emerged in northern and central India around the 6th century BCE, listed in Buddhist (the Anguttara Nikaya) and Jain texts, marking the rise of large territorial polities before the Mauryan unification. Key points The sixteen included
Stupa Architecture Definition The Buddhist (and Jain) hemispherical mound built to enshrine relics of the Buddha or a saint, one of the earliest forms of Indian monumental architecture, with a standard set of named parts. Key points Core form: a solid dome (anda) representing the cosmic mountain, topped by a squ
Sufi Movement Definition The mystical strand of Islam that reached India from about the 11th to 12th centuries, emphasising love of God, personal experience, music (sama), and tolerance over rigid orthodoxy. Key points Organised into silsilas (orders); the two most important in India were the Chishti and the Suh
Sufi Silsilas (Orders) Definition The chains or orders (silsilas) of Sufi mysticism in India, each tracing a spiritual lineage from master to disciple, divided into the bashara orders (following Islamic law) and the beshara (free of formal law). Key points Chishti order: founded in India by Khwaja Moinuddin Chis
Surat Split, 1907 Definition The split of the Indian National Congress at its Surat session in 1907 into two factions, the Moderates and the Extremists, over differences in aims and methods. Key points Occurred at the Surat session of the Congress in 1907, where the Moderates and Extremists openly broke ranks.
Swadeshi Movement Definition A nationalist economic and political movement that began in 1905 in response to the partition of Bengal, calling for the boycott of British goods and the use of Indianmade (swadeshi) products. Key points Triggered by Lord Curzon's partition of Bengal, announced in 1905, widely seen a
Swaraj Party Definition A party formed within the Congress in 1923 by leaders who wanted to enter the legislative councils and obstruct the government from within, after the suspension of the NonCooperation Movement. Key points Founded in 1923 (the CongressKhilafat Swarajya Party) by Motilal Nehru and Chittaranj
Temple Architecture Vocabulary (Nagara, Dravida, Vesara parts) Definition The shared structural vocabulary of the Hindu temple and the features that distinguish the three regional styles, the northern Nagara, the southern Dravida, and the hybrid Vesara of the Deccan. Key points Common parts: garbhagriha (sanctum
The Four Vedas Definition The four foundational texts of Vedic Sanskrit literature (the Rigveda, Samaveda, Yajurveda, and Atharvaveda), composed during the Vedic Age (roughly 1500 to 600 BCE) and central to early Indian religion and society. Key points Rigveda: the oldest, a collection of hymns (suktas) in prais
Traditional Theatre and Puppetry Forms Definition The regional forms of traditional Indian theatre (folk and ritual drama) and the four major styles of Indian puppetry, both rooted in storytelling from the epics and Puranas and tied to particular states. Key points Theatre forms by state: Ramlila and Nautanki (U
Tripitaka (Buddhist Canon) Definition The "three baskets" (Tripitaka in Sanskrit, Tipitaka in Pali), the earliest collection of Buddhist scriptures, compiled at the Buddhist councils and recording the teachings of the Buddha. Key points Vinaya Pitaka: the rules of monastic discipline (conduct of monks and nuns a
Vedangas and Upanishads Definition The two important strands attached to the Vedic corpus, the six Vedangas (auxiliary disciplines needed to study and recite the Vedas) and the Upanishads (the philosophical conclusion of the Vedas, called Vedanta). Key points The six Vedangas are: Shiksha (phonetics and pronunci
Vernacular Press Act, 1878 Definition A repressive law passed under Viceroy Lord Lytton in 1878 to control and censor Indianlanguage (vernacular) newspapers that were critical of British rule. Key points Passed in 1878 under Lord Lytton, it was aimed specifically at the vernacular (Indianlanguage) press, leaving
Vijayanagara Empire Definition A powerful South Indian empire (1336 to 1646) founded by Harihara and Bukka on the banks of the Tungabhadra, with its capital at Vijayanagara (modern Hampi), which long resisted the Deccan Sultanates. Key points Founded in 1336 by Harihara I and Bukka I (the Sangama dynasty); later
Zabt System (Dahsala) Definition The standard landrevenue system of the Mughal Empire, refined under Akbar by his revenue minister Raja Todar Mal, in which revenue was assessed in cash on the basis of measured land and average yields and prices. Key points Under the zabt system, cultivated land was measured (usi
Automatic Stabilisers Definition Features of the tax and spending system that automatically dampen swings in the business cycle without any fresh decision by the government, by reducing demand in a boom and supporting demand in a slump. Key points They work on their own through the existing rules, in contrast to
Balance of Payments (BoP) Definition A systematic record of all economic transactions between the residents of a country and the rest of the world over a given period. Key points Two main accounts: the current account (trade in goods and services, income, and transfers) and the capital and financial account (inv
Bank Rate Definition The longterm rate at which the Reserve Bank of India lends to banks against eligible securities without any repurchase agreement, now aligned with the marginal standing facility rate. Key points The oldest policy rate, defined under Section 49 of the RBI Act, 1934, as the rate at which the R
Base Effect Definition The way a current rate of change (such as inflation or growth) is distorted by the level in the earlier period used as the comparison base, so that an unusually high or low base makes the new figure look smaller or larger than the underlying trend. Key points Inflation and growth are usual
Base Rate and MCLR Definition Internal benchmark lending rates used by banks to price loans: the Base Rate (the older floor below which a bank could not lend) and the Marginal Cost of Funds based Lending Rate (MCLR), its 2016 successor tied to the marginal cost of funds. Key points The Base Rate replaced the old
Basel Norms Definition A set of international bankingsupervision standards issued by the Basel Committee on Banking Supervision, prescribing minimum capital that banks must hold against their risks. Key points Issued by the Basel Committee, hosted at the Bank for International Settlements (BIS) in Basel, Switzer
Bond Yield and Price Definition A bond's yield is the effective return an investor earns on it, while its price is the amount paid in the market; the two move in opposite directions for a fixedcoupon bond. Key points A bond pays a fixed coupon (interest) on its face value; when its market price rises, the same f
Capital Account Convertibility Definition The freedom to convert the domestic currency into foreign currency, and back, for capitalaccount transactions such as investment, borrowing, and the buying and selling of financial assets, without government restriction. Key points It covers crossborder capital flows: fo
Capital Market Instruments Definition Longterm financial instruments, with maturities beyond one year or no fixed maturity, through which companies and governments raise longterm capital from investors, regulated by SEBI. Key points Equity shares give ownership and voting rights with no fixed return; preference
Central Bank Digital Currency (eRupee) Definition A Central Bank Digital Currency (CBDC) is the legaltender digital form of a country's sovereign currency, issued and backed by the central bank; in India it is the erupee piloted by the RBI. Key points The RBI launched pilots of the Digital Rupee in 2022, in a wh
Cess and Surcharge Definition Two additional levies the Centre imposes over and above the basic tax: a cess is a tax earmarked for a specific purpose, while a surcharge is a tax on a tax with no earmarking, raising general revenue. Key points A cess is levied for a defined objective (for example a health and edu
Core Inflation Definition The measure of inflation that excludes the most volatile items, namely food and fuel, to reveal the steadier, underlying trend in prices. Key points Headline inflation covers the whole consumer basket; core inflation strips out food and fuel (sometimes written as "CPI excluding food and
Crowding Out Effect Definition The situation where heavy government borrowing to finance a deficit pushes up interest rates and reduces the funds available for private investment, so public spending "crowds out" private spending. Key points Mechanism: a large fiscal deficit means the government borrows heavily f
CRR and SLR Definition Two reserve requirements the RBI imposes on banks: the Cash Reserve Ratio (CRR), a share of deposits kept as cash with the RBI, and the Statutory Liquidity Ratio (SLR), a share kept in safe liquid assets. Key points CRR is the percentage of a bank's net demand and time liabilities (NDTL) h
Current Account Deficit (CAD) Definition A situation in the Balance of Payments where the outflows on the current account (imports of goods and services, factorincome payments) exceed inflows, so the country spends more abroad than it earns on current transactions. Key points The current account covers trade in
Current versus Capital Account Convertibility Definition Convertibility is the freedom to convert the domestic currency into foreign currency and back at market rates: current account convertibility covers trade and income flows, while capital account convertibility covers investment and asset flows. Key points
Deficit Financing Definition The practice of meeting a government's budget gap by borrowing or, in the narrower Indian sense, by the central bank creating new money, rather than by raising taxes or cutting spending. Key points In Indian usage, deficit financing traditionally meant the government borrowing from t
Demographic Dividend Definition The potential boost to economic growth that arises when a country has a large and rising share of workingage population (15 to 64 years) relative to dependants (children and the elderly), lowering the dependency ratio. Key points It occurs during the demographic transition, when b
Deposit Insurance (DICGC) Definition A guarantee that protects bank depositors up to a fixed amount if their bank fails, administered in India by the Deposit Insurance and Credit Guarantee Corporation, a wholly owned subsidiary of the RBI. Key points The DICGC was set up under the DICGC Act, 1961; it is owned by
Devaluation versus Depreciation Definition Two ways a currency loses value against foreign currency: devaluation is a deliberate official reduction of the currency's value under a fixed or managed exchange rate, while depreciation is a marketdriven fall in value under a floating exchange rate. Key points Devalua
Direct versus Indirect Tax Definition Two broad categories of taxes: a direct tax is levied on income or wealth and is borne by the same person who pays it, while an indirect tax is levied on goods and services and can be passed on to the final consumer. Key points In a direct tax the impact and incidence fall o
Disinvestment Definition The sale by the government of part or all of its equity in a publicsector enterprise, to raise resources and improve efficiency. Key points Minority disinvestment keeps government control (sale of a minority stake); strategic disinvestment transfers management control to a private buyer
Dutch Disease Definition The harm to a country's wider economy when a boom in one sector (typically naturalresource exports or a large inflow of foreign money) pushes up the exchange rate and makes the country's other tradable industries, especially manufacturing, uncompetitive. Key points The name comes from th
Ease of Doing Business Definition A measure of how friendly a country's regulatory environment is to starting and running a business, traditionally captured by the World Bank's Doing Business rankings and now by its successor framework. Key points The World Bank's flagship Doing Business report ranked economies
Engel's Law Definition An empirical regularity, stated by the statistician Ernst Engel, that as a household's income rises the proportion of income spent on food falls, even though the absolute amount spent on food may rise. Key points It is about the share of spending on food, not the absolute amount; richer ho
External Debt Definition The total money a country owes to foreign creditors, including borrowings by the government, public sector, and private sector from nonresidents and international institutions, denominated in foreign or domestic currency. Key points It includes external commercial borrowings, NRI deposit
FDI versus FII Definition Two channels of foreign investment: Foreign Direct Investment (FDI) is a lasting investment with management control in an enterprise, while Foreign Institutional Investment (FII, now broadly FPI) is shortterm portfolio investment in financial securities. Key points FDI involves a lastin
Financial Inclusion Definition The process of ensuring that all sections of society, especially the poor and rural population, have access to affordable formal financial services: bank accounts, credit, insurance, pensions and digital payments. Key points The flagship scheme is the Pradhan Mantri Jan Dhan Yojana
Fiscal Deficit Definition The gap between the government's total expenditure and its total receipts excluding borrowings, which equals the amount the government must borrow in a year. Key points Fiscal deficit equals total expenditure minus (revenue receipts plus nondebt capital receipts); it shows the total bor
Fiscal Drag Definition The effect by which inflation or rising nominal incomes push taxpayers into higher tax slabs even though their real income has not risen, so the government's tax take rises and demand is dragged down. Key points It happens when tax slabs (the income thresholds) are not adjusted ("indexed")
Fiscal Federalism Definition The division of taxation, spending, and financial powers between the central government and the states in a federal system, and the arrangements for sharing and transferring funds between them. Key points In India the Constitution divides taxing and spending powers through the Union,
Fiscal Responsibility and Budget Management (FRBM) Act Definition The FRBM Act, 2003, is the central law that mandates fiscal discipline by setting targets to limit the government's fiscal deficit and debt and by requiring greater budget transparency. Key points Enacted in 2003 and brought into force in 2004; it
Fiscal versus Monetary Policy Definition Two arms of macroeconomic management: fiscal policy is the government's use of taxation, spending, and borrowing to influence the economy, while monetary policy is the central bank's use of interest rates and the money supply to manage inflation and growth. Key points Fis
Foreign Exchange Reserves Definition External assets held and controlled by the Reserve Bank of India that can be used to meet balanceofpayments needs, intervene in the currency market, and back confidence in the rupee. Key points The four components are foreign currency assets (the largest share), gold, Special
Functions of the RBI Definition The set of centralbanking roles performed by the Reserve Bank of India, established under the RBI Act, 1934, and nationalised in 1949, covering currency, monetary policy, banking regulation and externalsector management. Key points The RBI began operations on 1 April 1935 under th
GDP and GNP Definition Two measures of national income: Gross Domestic Product (GDP) is the value of goods and services produced within a country, while Gross National Product (GNP) adds the net income earned abroad by its residents. Key points GDP is output produced inside the country's borders, regardless of w
GDP Deflator Definition A broad measure of the price level for the whole economy, calculated as the ratio of nominal GDP (at current prices) to real GDP (at constant prices), and used to convert between the two. Key points Formula: GDP deflator equals (nominal GDP divided by real GDP) multiplied by 100; it shows
Gini Coefficient Definition A single summary measure of inequality in income or consumption within a population, ranging from 0 (perfect equality) to 1 (perfect inequality), derived from the Lorenz curve. Key points It equals the area between the line of perfect equality and the Lorenz curve, divided by the tota
Goods and Services Tax (GST) Definition A unified, destinationbased indirect tax on the supply of goods and services in India, which replaced a web of central and state indirect taxes. Key points Introduced by the Constitution (101st Amendment) Act, 2016; effective 1 July 2017. A destinationbased, multistage ta
Government Securities Definition Tradable debt instruments issued by the central or state governments to borrow money, backed by the sovereign and therefore treated as riskfree; the RBI manages their issue as the government's debt manager. Key points Dated Gsecs are longterm securities (maturities of 5 to 40 yea
Gross versus Net Fiscal Deficit Definition The gross fiscal deficit is the government's total borrowing requirement in a year (total expenditure minus receipts excluding borrowing); the net fiscal deficit is the gross fiscal deficit minus the net lending (loans) the government itself extends to others, such as state
GST Tax Slabs Definition The set of standard rate brackets under the Goods and Services Tax, into which goods and services are classified so that essentials are taxed low and luxury or "demerit" goods are taxed high. Key points The core GST rate structure has multiple slabs (broadly 0, 5, 12, 18 and 28 percent),
Hard versus Soft Currency Definition A hard currency is one that is widely trusted, stable in value, and freely accepted in international trade and as a reserve; a soft currency is unstable, weak, and not readily accepted outside its home country. Key points Hard currencies are backed by strong, stable economies
Hot Money Definition Shortterm, speculative capital that moves quickly across borders chasing the highest shortterm return or safety, and which can leave a country just as fast as it arrives. Key points It typically takes the form of portfolio flows into stocks and bonds (foreign portfolio investment), not longt
Human Development Index (HDI) Definition A composite index published by the United Nations Development Programme (UNDP) that measures average achievement in three basic dimensions of human development: a long and healthy life, knowledge, and a decent standard of living. Key points The three dimensions are health
Inflation Definition A sustained rise in the general level of prices in an economy over time, which reduces the purchasing power of money. Key points Measured by indices: the Consumer Price Index (CPI, the RBI's target measure) and the Wholesale Price Index (WPI). Types include demandpull (excess demand) and co
Insolvency and Bankruptcy Code Definition A 2016 law that consolidated India's insolvency rules into a single, timebound process for resolving the debts of firms and individuals, aimed at recovering value and freeing up stuck capital. Key points The Insolvency and Bankruptcy Code (IBC), 2016, replaced a patchwor
IPO and the Primary Market Definition The primary market is where a company raises fresh capital by issuing new securities to investors for the first time; an Initial Public Offering (IPO) is the first sale of shares by a private company to the public. Key points In an IPO a company offers shares to the public f
JCurve Effect Definition The pattern by which a country's trade balance first worsens after its currency depreciates and only later improves, so that a graph of the trade balance over time looks like the letter J. Key points Logic: just after a depreciation, import prices rise immediately while export and import
Kuznets Curve Definition An invertedU hypothesis, put forward by economist Simon Kuznets, proposing that as a country develops, income inequality first rises and then falls once a certain average income is reached. Key points On the vertical axis is inequality and on the horizontal axis is percapita income or th
Laffer Curve Definition A bellshaped curve, associated with economist Arthur Laffer, showing the relationship between the tax rate and total tax revenue: beyond an optimal rate, raising the rate further reduces revenue. Key points At a zero percent rate revenue is zero; at a hundred percent rate revenue is also
Lender of Last Resort Definition The role of the central bank in providing emergency funds to a solvent but illiquid bank or to the banking system when no other lender will, so as to prevent a panic from spreading. Key points It is one of the classic functions of the Reserve Bank of India as the central bank, al
Liquidity Adjustment Facility Definition The RBI's main daytoday liquiditymanagement tool, under which banks borrow from or park funds with the central bank against government securities, defining the shortterm interestrate corridor. Key points Introduced in 2000, the LAF lets the RBI inject liquidity through re
Liquidity Trap Definition A situation in which interest rates are already very low (near zero) and monetary policy becomes powerless to stimulate the economy, because people hoard cash rather than spend or invest even when more money is supplied. Key points At very low rates people expect rates can only rise (an
Lorenz Curve Definition A graph that plots the cumulative share of total income (or wealth) on the vertical axis against the cumulative share of the population, ranked from poorest to richest, on the horizontal axis; it visualises how equally income is distributed. Key points The 45degree diagonal is the line of
Marginal Propensity to Consume Definition The fraction of an additional unit of income that a household spends on consumption rather than saving, that is, the change in consumption divided by the change in income. Key points It is written MPC and lies between 0 and 1; the rest of the extra income is saved, measu
Marginal Standing Facility Definition An overnight window through which banks can borrow emergency funds from the Reserve Bank of India at a penal rate above the repo rate, by dipping into their statutory liquidity reserves. Key points Introduced in 2011 as the upper bound of the interestrate corridor; banks use
Minimum Support Price (MSP) Definition The preannounced price at which the government offers to buy certain crops from farmers, to assure them a minimum return and protect them against a sharp fall in market prices. Key points Recommended by the Commission for Agricultural Costs and Prices (CACP) and announced b
Monetary Policy Definition The use by the Reserve Bank of India of policy rates and liquidity tools to manage the money supply, control [[conceptinflation]], and support growth. Key points Conducted by the RBI under the RBI Act, with the framework formalised in 2016 around flexible inflation targeting. The Mone
Monetary Policy Committee Definition The sixmember statutory body that decides India's policy interest rate to meet the inflation target, the core institution of flexible inflation targeting under the RBI. Key points Constituted under the amended RBI Act, 1934, after the 2016 monetarypolicy framework agreement;
Money Market Instruments Definition Shortterm, highly liquid debt instruments, with maturities of up to one year, traded in the money market to meet the temporary funds needs of banks, companies and the government. Key points Treasury Bills (Tbills) are shortterm government borrowings issued at a discount and re
Money Multiplier Definition The factor by which the total money supply expands for each unit of base money (highpowered money) created by the central bank, arising because banks lend out most of their deposits, which then return to the banking system as fresh deposits. Key points Base money (also called highpowe
Money Multiplier and Credit Creation Definition The process by which the banking system expands the initial deposit base into a larger volume of money through repeated lending, and the multiplier that links the central bank's reserve money to the total money supply. Key points When a bank receives a deposit, it
Money Supply and Monetary Aggregates Definition The total stock of money circulating in the economy at a point in time, measured by the RBI through a graded set of monetary aggregates from the most liquid (M1) to the least liquid (M4). Key points M0 is reserve money or highpowered money: currency in circulation
Multidimensional Poverty Index (MPI) Definition A poverty measure that captures deprivation across multiple dimensions of life rather than income alone, identifying people who are poor in several aspects simultaneously. Key points The global MPI is published jointly by the UNDP (Human Development Report Office)
Mutual Funds Definition Investment vehicles that pool money from many investors and invest it in a diversified portfolio of shares, bonds or other securities, managed by professional fund managers under SEBI regulation. Key points Each investor holds units; the value of one unit is the Net Asset Value (NAV), cal
Nominal and Real Effective Exchange Rate (NEER and REER) Definition Tradeweighted indices of a currency's value against a basket of other currencies: the Nominal Effective Exchange Rate (NEER) is the weighted average without adjusting for prices, while the Real Effective Exchange Rate (REER) adjusts the NEER for rel
NonBanking Financial Companies Definition Financial companies that lend and invest like banks but do not hold a banking licence; they are registered under the Companies Act and regulated by the RBI, and cannot accept demand deposits. Key points An NBFC's principal business is finance: loans and advances, leasing
NPA and Twin Balance Sheet Problem Definition A NonPerforming Asset (NPA) is a loan on which the borrower has stopped paying interest or principal for 90 days or more; the Twin Balance Sheet problem is the linked stress on overleveraged corporates and the banks that lent to them. Key points The RBI classifies a
Open Market Operations Definition The buying and selling of government securities by the Reserve Bank of India in the open market to manage durable liquidity and the money supply in the banking system. Key points An OMO purchase injects liquidity (the RBI pays banks cash for securities); an OMO sale absorbs liqu
Payment Banks Definition A differentiated category of banks licensed by the RBI to accept small deposits and offer payments and remittance services, but barred from lending or issuing credit cards. Key points Recommended by the Nachiket Mor Committee (2014); the RBI issued the first licences in 2015 to entities
Phillips Curve Definition A relationship, first observed by economist A. W. Phillips, showing an inverse shortrun tradeoff between the rate of unemployment and the rate of inflation: lower unemployment tends to come with higher inflation, and vice versa. Key points The idea: when unemployment is low, labour is s
Poverty Line Definition A threshold level of income or consumption expenditure below which a person or household is officially counted as poor; people below it form the "below poverty line" (BPL) population. Key points In India the poverty line has traditionally been anchored to a minimum calorie norm translated
Primary Deficit Definition The fiscal deficit minus interest payments on past borrowing; it measures the borrowing requirement of the government in the current year excluding the burden of accumulated past debt. Key points Primary deficit equals fiscal deficit minus interest payments. It isolates fresh borrowin
Priority Sector Lending Definition An RBI requirement that banks direct a fixed share of their lending to sectors deemed important for inclusive growth but underserved by normal credit, such as agriculture, small enterprises and weaker sections. Key points Domestic commercial banks must lend 40 percent of Adjust
Purchasing Power Parity (PPP) Definition A method of comparing economies by adjusting for differences in price levels, so that a given amount of money buys the same basket of goods and services across countries; it converts incomes at a PPP exchange rate rather than the market exchange rate. Key points PPP says
Real versus Nominal Interest Definition The nominal interest rate is the stated, money rate of return on a loan or deposit; the real interest rate is the nominal rate adjusted for inflation, showing the true gain in purchasing power. Key points The relationship (the Fisher equation) is approximately: real intere
Repo Rate Definition The interest rate at which the Reserve Bank of India lends shortterm money to commercial banks against government securities, the main policy rate of monetary policy. Key points "Repo" stands for repurchase agreement: banks sell securities to the RBI and agree to buy them back, paying the re
Revenue Neutral Rate (RNR) Definition The single rate of tax at which the government collects the same amount of revenue under a new tax regime as it did under the old one; it was a key concept while designing GST so that the switch did not lose revenue. Key points The RNR is the rate that keeps total tax collec
Revenue versus Capital Expenditure Definition Two classes of government spending: revenue expenditure is recurring spending that neither creates assets nor reduces liabilities, while capital expenditure either creates physical or financial assets or reduces liabilities. Key points Revenue expenditure covers dayt
Revenue versus Capital Receipts Definition Two classes of government income: revenue receipts neither create a liability nor reduce an asset, while capital receipts either create a liability (borrowing) or reduce an asset (disinvestment). Key points Revenue receipts split into tax revenue (direct and indirect ta
SEBI Definition The Securities and Exchange Board of India, the statutory regulator of the securities and capital markets, tasked with protecting investors and promoting fair, orderly market development. Key points Set up as a nonstatutory body in 1988 and given statutory powers by the SEBI Act, 1992; its headqu
Seigniorage Definition The profit a government or central bank makes from creating money, equal to the difference between the face value of the currency issued and the cost of producing it. Key points Producing a highvalue note or coin costs far less than its face value, so the issuer earns the gap as revenue.
Special Drawing Rights (SDR) Definition An international reserve asset created by the International Monetary Fund (IMF) to supplement the official reserves of member countries; it is not a currency but a claim on freely usable currencies of IMF members. Key points Created by the IMF in 1969; its value is based o
Standing Deposit Facility Definition A liquidity tool through which the Reserve Bank of India absorbs surplus funds from banks without giving any collateral in return, forming the floor of the interestrate corridor. Key points Operationalised in April 2022 as the lower bound of the Liquidity Adjustment Facility
Sterilisation by the RBI Definition The Reserve Bank's action to neutralise the effect of its foreignexchange operations on the domestic money supply, so that buying or selling foreign currency does not change the rupee liquidity in the system. Key points When the RBI buys foreign currency (to stop the rupee app
Stock Exchanges and Indices Definition Organised marketplaces where shares and other securities are bought and sold (stock exchanges), and the benchmark numbers that track the price movement of a representative basket of shares (indices). Key points The Bombay Stock Exchange (BSE), founded in 1875, is Asia's old
Tax Buoyancy and Tax Elasticity Definition Two measures of how tax revenue responds to economic growth: tax buoyancy is the responsiveness of total tax revenue to a change in GDP including the effect of rate and base changes, while tax elasticity isolates the response when tax rates and the tax structure are held co
TaxtoGDP Ratio Definition The total tax revenue collected by the government as a share of the country's gross domestic product; it shows how much of the economy's output is mobilised as tax. Key points It is computed as total tax revenue divided by GDP, expressed as a percentage, and can be measured for the Cent
Trade Balance and Trade Deficit Definition The trade balance (balance of trade) is the difference between the value of a country's merchandise (goods) exports and imports over a period; a trade deficit occurs when goods imports exceed goods exports, and a trade surplus when exports exceed imports. Key points The
Twin Deficit Definition The situation where a country runs both a fiscal deficit (government spending exceeds receipts) and a current account deficit (external payments exceed receipts) at the same time, the two being seen as linked. Key points The "twin deficit hypothesis" holds that a large fiscal deficit can
Types of Banks in India Definition The categories of banking institutions in India, distinguished by ownership, function and the degree of services they may offer, all overseen by the RBI under the Banking Regulation Act, 1949. Key points Scheduled banks are those listed in the Second Schedule of the RBI Act, 19
Types of Inflation Definition The classifications of a sustained price rise by its cause (demandpull or costpush) and by its pace (creeping, walking, galloping, or hyperinflation). Key points Demandpull inflation: too much money chasing too few goods, when aggregate demand outruns supply (often from loose moneta
Types of Unemployment Definition The main forms that joblessness takes in an economy, classified by the cause and duration of the inability to find paid work despite willingness to work at the prevailing wage. Key points Frictional: shortterm, transitional unemployment while people move between jobs or search fo
UPI and Digital Payments Definition The Unified Payments Interface (UPI) is a realtime, mobilebased system that allows instant transfer of money between bank accounts using a single identifier, part of India's wider digitalpayments infrastructure built by the NPCI. Key points UPI was launched in 2016 by the Nati
Velocity of Money Definition The average number of times a unit of money changes hands to buy goods and services in a given period, measuring how fast money circulates in the economy. Key points It is defined as the ratio of nominal income (or nominal GDP) to the money supply: velocity equals nominal GDP divided
Vertical versus Horizontal Devolution Definition Two dimensions of how central tax revenue is shared under the Finance Commission's award: vertical devolution is the share of the divisible pool given by the centre to the states as a whole, while horizontal devolution is how that states' share is divided among the in
Acids, Bases and Salts Definition Acids are substances that release hydrogen ions in water and taste sour; bases (their alkalis when soluble) release hydroxide ions and taste bitter; a salt is formed when an acid reacts with a base. Key points Acids turn blue litmus red; bases turn red litmus blue; the pH scale
Alloys Definition A solid mixture (or solution) of two or more elements, at least one of which is a metal, made to obtain properties better than those of the pure metals. Key points Alloying improves strength, hardness, corrosion resistance, or appearance; for example pure iron is soft, but steel (iron with carb
Antibiotics vs Antivirals Definition Two classes of medicines that fight infection: antibiotics act against bacteria, while antivirals act against viruses. Key points Antibiotics kill or stop the growth of bacteria, for example penicillin (the first antibiotic, discovered by Alexander Fleming in 1928 from the mo
Applications of the Laws of Motion Definition The practical, everyday consequences of Newton's three laws, especially momentum, recoil, banking of roads, and friction, that explain how forces produce motion in real situations. Key points Conservation of momentum explains recoil: when a rifle is fired, the forwar
Archimedes' Principle Definition The principle that a body wholly or partly immersed in a fluid experiences an upward buoyant force equal to the weight of the fluid it displaces. Key points The upward push (buoyant force) equals the weight of the displaced fluid; this is why objects feel lighter in water. An ob
Artificial Intelligence (AI) Definition The branch of computer science that builds machines and software able to perform tasks normally requiring human intelligence, such as learning, reasoning, recognising patterns, and understanding language. Key points Machine learning is a subset of AI in which systems learn
Ballistic vs Cruise Missiles Definition Two broad classes of guided missiles distinguished by how they fly to the target: a ballistic missile follows a high arcing trajectory mostly under gravity, while a cruise missile flies low and level like a guided aircraft. Key points A ballistic missile is rocketpowered o
Biofuels Definition Fuels produced from recently living biological material (biomass) such as crops, plant waste, and algae, used as renewable alternatives to fossil fuels. Key points Bioethanol is alcohol made by fermenting sugar or starch crops (sugarcane, maize) and is blended with petrol; biodiesel is made f
Biofuels Generations Definition A classification of biofuels by the type of raw material (feedstock) used to make them, from food crops to waste, algae, and engineered organisms. Key points Firstgeneration biofuels are made from food crops such as sugarcane, corn, and edible oils (for example ethanol from sugarc
Blockchain Definition A distributed, tamperresistant digital ledger in which records (blocks) are linked using cryptography and stored across many computers rather than a single central authority. Key points Each block contains data, a timestamp, and a cryptographic link to the previous block; altering one block
Capacitors and Resistors Definition Two basic passive components of electric circuits: a resistor opposes the flow of current, while a capacitor stores electrical charge and energy. Key points A resistor limits current; its opposition is called resistance, measured in ohms, and it converts electrical energy into
Catalysts Definition Substances that speed up a chemical reaction without being consumed or permanently changed in the process, by lowering the energy barrier the reaction must cross. Key points A catalyst lowers the activation energy, so the reaction proceeds faster, but it does not alter how much product can u
CRISPR Gene Editing Definition A precise geneediting technology (CRISPRCas9) that can cut DNA at a chosen location so that genes can be removed, corrected, or inserted, often called genetic "cut and paste". Key points CRISPR stands for Clustered Regularly Interspaced Short Palindromic Repeats; it is adapted from
Disease Vectors Definition Living organisms, usually insects, that carry and transmit diseasecausing pathogens from one host to another without themselves causing the disease. Key points The female Anopheles mosquito transmits malaria (a protozoan parasite, Plasmodium), while the Aedes (aegypti) mosquito transmi
DNA and RNA Definition DNA (deoxyribonucleic acid) and RNA (ribonucleic acid) are the nucleic acids that store and transmit genetic information in living organisms. Key points DNA is a double helix; its structure was described by James Watson and Francis Crick in 1953, using Xray data from Rosalind Franklin. DN
Doppler Effect Definition The apparent change in the frequency (or wavelength) of a wave when the source and the observer move relative to each other. Key points As a source approaches, waves bunch up and the observed frequency rises (higher pitch); as it recedes, waves stretch out and frequency falls (lower pit
Electromagnetic Induction Definition The production of an electric current in a conductor when the magnetic field around it changes, discovered by Michael Faraday in 1831. Key points A current is induced whenever there is relative motion between a magnet and a coil, or any change in the magnetic field linking th
Electromagnetic Spectrum Definition The full range of electromagnetic waves arranged in order of wavelength and frequency, from lowfrequency radio waves to highfrequency gamma rays, all travelling at the speed of light in vacuum. Key points Order from longest wavelength (lowest frequency) to shortest wavelength
Endocrine Glands and Hormones Definition Ductless glands that secrete chemical messengers called hormones directly into the bloodstream to regulate body functions such as growth, metabolism, and reproduction. Key points The pituitary gland, at the base of the brain, is called the master gland because it controls
Enzymes Definition Biological catalysts, mostly proteins, that speed up the chemical reactions inside living organisms without being used up themselves. Key points Each enzyme is highly specific and acts on a particular substance (substrate), often described by a "lock and key" fit between enzyme and substrate.
Fermentation and Microbes Definition Fermentation is the breakdown of sugars by microorganisms in the absence of oxygen, used by humans to make food, drink, and industrial products. Key points Yeast (a fungus) ferments sugar into ethanol and carbon dioxide; the carbon dioxide makes bread rise, and the ethanol is
Fuel Cells and Hydrogen Energy Definition A fuel cell is a device that converts the chemical energy of a fuel, usually hydrogen, directly into electricity through a reaction with oxygen, producing water as the main byproduct. Key points In a hydrogen fuel cell, hydrogen and oxygen combine; the only emission is w
Genetic Disorders Definition Diseases caused by abnormalities in an individual's genes or chromosomes, which may be inherited from parents or arise from new mutations. Key points Sickle cell anaemia and thalassaemia are inherited disorders of haemoglobin that cause abnormal or insufficient red blood cells; both
Genetically Modified Crops Definition Crops whose genetic material has been altered using genetic engineering to introduce a desired trait, such as pest resistance, herbicide tolerance, or improved nutrition. Key points A specific gene from another organism is inserted into the crop's DNA to give a new trait; th
GPS and NavIC Definition Satellite navigation systems that let a receiver on the ground work out its precise position and time; GPS is the United States system, while NavIC is India's own regional system. Key points A navigation receiver measures the time signals take to arrive from several satellites and uses t
Greenhouse Effect and Global Warming Definition The greenhouse effect is the trapping of outgoing heat (infrared radiation) by certain gases in the atmosphere; its intensification by human activity drives global warming and climate change. Key points Greenhouse gases include carbon dioxide (CO2), methane (CH4),
Heat Transfer Modes Definition The three ways in which heat energy moves from a hotter region to a colder one: conduction, convection, and radiation. Key points Conduction is heat transfer through direct contact without the material itself moving; it dominates in solids, especially metals, which are good conduct
Human Blood Groups Definition A classification of human blood based on the presence or absence of specific antigens on the surface of red blood cells, chiefly the ABO and Rh systems. Key points The ABO system has four groups: A, B, AB, and O, decided by A and B antigens on red cells and the matching antibodies i
Internet of Things (IoT) Definition A network of everyday physical objects fitted with sensors, software, and connectivity that collect and exchange data over the internet without needing human input. Key points Examples include smart watches, smart home devices (lights, thermostats, cameras), connected vehicles
Isotopes, Isobars and Isotones Definition Three ways of classifying atoms by comparing their numbers of protons (atomic number), mass number (protons plus neutrons), and neutrons. Key points Isotopes are atoms of the same element (same number of protons, same atomic number) with different numbers of neutrons, so
Lasers Definition A device that produces an intense, narrow beam of light in which the waves are of a single colour and march in step; the word stands for Light Amplification by Stimulated Emission of Radiation. Key points Laser light is monochromatic (single wavelength), coherent (waves in phase), and highly di
Laws of Thermodynamics Definition The fundamental physical laws governing how heat, work, and energy change and flow in any system. Key points The zeroth law states that if two bodies are each in thermal equilibrium with a third, they are in equilibrium with each other; this is the basis of temperature measureme
Lenses and Mirrors Definition Optical devices that form images by refracting light (lenses) or reflecting light (mirrors), used to magnify, focus, or redirect light. Key points A convex (converging) lens is thicker in the middle and converges parallel light to a focus; a concave (diverging) lens is thinner in th
Monoclonal Antibodies Definition Identical antibodies produced in the laboratory from a single clone of immune cells, designed to bind one specific target (antigen) for use in diagnosis and treatment. Key points Because they all come from one parent cell, every molecule is identical and recognises the same singl
Nanomaterials Definition Materials with at least one dimension in the nanometre range (roughly 1 to 100 nanometres), at which scale they often show properties very different from the same substance in bulk. Key points A nanometre is one billionth of a metre; at this scale the large surfaceareatovolume ratio and
Nanotechnology Definition The science and engineering of materials and devices at the nanoscale (roughly 1 to 100 nanometres), where matter shows new properties different from those of bulk material. Key points A nanometre is onebillionth of a metre (10 to the power minus 9 metres); at this scale, properties suc
Newton's Laws of Motion Definition The three laws stated by Isaac Newton that describe the relationship between the motion of a body and the forces acting on it, forming the foundation of classical mechanics. Key points First law (law of inertia): a body continues at rest or in uniform straightline motion unless
Nuclear Fission and Fusion Definition Two nuclear reactions that release energy: fission splits a heavy nucleus into lighter ones, while fusion joins light nuclei into a heavier one; both convert a small loss of mass into energy. Key points Fission: a heavy nucleus such as uranium235 or plutonium239 splits when
Optical Fibre Definition A thin, flexible strand of glass or plastic that carries information as pulses of light along its length, working on the principle of total internal reflection. Key points Light enters one end and bounces along the fibre by total internal reflection, staying trapped inside with very litt
Ozone Depletion Definition The thinning of the ozone layer in the stratosphere, caused mainly by manmade chemicals, which reduces the Earth's shield against harmful ultraviolet radiation. Key points The ozone layer lies in the stratosphere (roughly 15 to 35 km up) and absorbs most of the Sun's harmful ultraviole
pH and Indicators Definition The pH scale measures how acidic or basic a solution is, and indicators are substances that change colour to reveal that acidity or basicity. Key points The pH scale runs from 0 to 14: below 7 is acidic, exactly 7 is neutral (pure water), and above 7 is basic (alkaline); each wholenu
pH Scale Definition A logarithmic scale from 0 to 14 that measures how acidic or basic (alkaline) a solution is, based on the concentration of hydrogen ions. Key points pH 7 is neutral (pure water); below 7 is acidic; above 7 is basic or alkaline. The scale is logarithmic: each unit change is a tenfold change i
Photoperiodism Definition The response of plants (and some animals) to the relative lengths of day and night, which controls processes such as flowering. Key points Plants are grouped by their flowering response: shortday plants flower when the daylight is shorter than a critical length (rice, soybean, chrysanth
Photosynthesis Definition The process by which green plants, algae, and some bacteria use sunlight to convert carbon dioxide and water into glucose and oxygen, using the pigment chlorophyll. Key points Word summary: carbon dioxide plus water, in the presence of sunlight and chlorophyll, yield glucose plus oxygen
Polymerase Chain Reaction (PCR) Definition A laboratory technique that rapidly makes millions of copies of a specific DNA segment, allowing tiny amounts of genetic material to be amplified for study or detection. Key points PCR repeatedly cycles through three steps: denaturation (heating to separate the DNA stra
Properties of Sound Definition Sound is a longitudinal mechanical wave produced by vibrating bodies that travels through a material medium by compressions and rarefactions. Key points Sound needs a medium and cannot travel through a vacuum; it travels fastest in solids, slower in liquids, and slowest in gases (a
Quantum Computing Definition A form of computing that uses the rules of quantum mechanics, where the basic unit (the qubit) can represent multiple states at once, enabling certain problems to be solved far faster than on ordinary computers. Key points A classical bit is either 0 or 1; a quantum bit (qubit) can b
Radioactivity Definition The spontaneous emission of radiation from the unstable nucleus of certain atoms as they decay into more stable forms. Key points The three main types of radiation are alpha (a helium nucleus, least penetrating, stopped by paper), beta (electrons, stopped by aluminium), and gamma (highen
Semiconductor Devices Definition Electronic components made from semiconductor materials such as silicon, whose conductivity can be controlled to switch, amplify, or convert electrical signals. Key points A diode allows current to flow in only one direction; it is used as a rectifier to convert alternating curre
Semiconductors Definition Materials whose electrical conductivity lies between that of conductors and insulators and can be controlled, making them the basis of modern electronics. Key points Common semiconductors are silicon and germanium; their conductivity rises with temperature and with added impurities, unl
Simple Machines Definition Basic mechanical devices that change the magnitude or direction of a force, making work easier by trading distance for force. Key points The six classic simple machines are the lever, pulley, wheel and axle, inclined plane, wedge, and screw. Mechanical advantage is the ratio of load (
Stem Cells Definition Unspecialised cells that can divide to renew themselves and can develop (differentiate) into specialised cell types such as nerve, muscle, or blood cells. Key points Embryonic stem cells (from early embryos) can form almost any cell type and are described as pluripotent; adult (somatic) ste
Superconductors Definition Materials that, below a certain very low temperature, conduct electricity with zero electrical resistance and expel magnetic fields from their interior. Key points Below the critical temperature, a superconductor carries current with no energy loss, so a current set up in a loop can pe
Surface Tension and Viscosity Definition Two properties of fluids: surface tension is the tendency of a liquid surface to behave like a stretched elastic sheet, and viscosity is a fluid's internal resistance to flow. Key points Surface tension arises because molecules at the surface are pulled inward by their ne
Total Internal Reflection Definition The complete reflection of a light ray back into a denser medium when it strikes the boundary with a rarer medium at an angle greater than the critical angle. Key points It occurs only when light travels from a denser to a rarer medium (for example glass to air or water to ai
Types of Immunity Definition The body's defence against diseasecausing organisms, classified by whether it is present from birth or developed later, and by how it is acquired. Key points Innate (nonspecific) immunity is present from birth and acts the same against all pathogens; it includes skin, mucus, stomach
Types of Renewable Energy Definition Energy from sources that are naturally replenished on a human timescale, such as sunlight, wind, water, biomass, and the Earth's internal heat, in contrast to finite fossil fuels. Key points Solar energy is harnessed by photovoltaic cells (electricity directly) and by solar t
Types of Satellites and Orbits Definition Artificial objects placed in orbit around the Earth, classified by their purpose and by the altitude and shape of the orbit they occupy. Key points A geostationary orbit lies about 36,000 kilometres above the equator; a satellite there circles in 24 hours and so appears
Types of Vaccines Definition Preparations that train the immune system to recognise a specific pathogen, classified by what form of the pathogen or its components they contain. Key points Live attenuated vaccines use a weakened but living pathogen and give strong, longlasting immunity; examples include BCG (tube
Ultrasound and SONAR Definition Ultrasound is sound of frequency above the human hearing range (over 20,000 hertz); SONAR (Sound Navigation and Ranging) is a technique that uses such sound waves to detect and locate objects under water. Key points The human ear hears roughly 20 hertz to 20,000 hertz; below 20 he
Vaccines and Immunity Definition Immunity is the body's ability to resist diseasecausing organisms; a vaccine is a preparation that trains the immune system to recognise and fight a specific pathogen. Key points A vaccine introduces a weakened, killed, or part of a pathogen (or its genetic instructions), prompti
Vitamins and Deficiency Diseases Definition Vitamins are organic micronutrients needed in small amounts for normal body functioning; their shortage causes specific deficiency diseases. Key points Fatsoluble vitamins (stored in the body): A, D, E, K. Watersoluble vitamins (not stored, needed regularly): the Bcomp