Practice SetsPractice Sets · Paper I

General Science Practice Set 05

Authored CAPF-level general science MCQs (physics, chemistry, biology, defence and space) with answer key and explanations, not verbatim PYQs

CAPF wiki•6 min read•4 sections

At a glance

PaperPaper ISubjectGeneral Science

Authored practice, not a verbatim PYQ. Twenty-five CAPF-level questions, with a few on space and defence technology relevant to the forces. Attempt closed-book, then check the key and explanations.

Questions

Q1The acceleration due to gravity on the Earth's surface is approximately:

A8.8 m/s²
B9.8 m/s²
C10.8 m/s²
D6.8 m/s²

Q2Which of the following is the chemical formula of ozone?

Q3DNA is found mainly in which part of the cell?

ACytoplasm
BNucleus
CCell wall
DVacuole

Q4The defence missile of India that is a supersonic cruise missile developed jointly with Russia is:

AAgni
BPrithvi
CBrahMos
DNag

Q5Which of the following diseases is NOT caused by a virus?

APolio
BMeasles
CMalaria
DChickenpox

Q6The phenomenon of a satellite staying over a fixed point above the equator is called:

APolar orbit
BGeostationary orbit
CSun-synchronous orbit
DElliptical orbit

Q7The chemical commonly known as marsh gas is:

AMethane
BEthane
CCarbon monoxide
DAmmonia

Q8Which vitamin deficiency causes pernicious anaemia?

AVitamin A
BVitamin B12
CVitamin C
DVitamin D

Q9Which of the following is used as fuel in nuclear power plants in India?

ACoal
BUranium
CPetrol
DHydrogen

Q10 (statement-based). Consider the following about Newton's laws of motion:

The first law is also called the law of inertia.
The second law relates force to the rate of change of momentum.
The third law states that to every action there is an equal and opposite reaction. Which are correct?

(a) 1 and 2 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3

Q11Which gas is responsible for the foul smell of rotten eggs?

ACarbon dioxide
BHydrogen sulphide
CSulphur dioxide
DAmmonia

Q12Bulletproof jackets are commonly made using which high-strength synthetic fibre?

ANylon
BKevlar
CRayon
DPolyester

Q13The instrument used to detect and measure radioactivity is the:

ABarometer
BGeiger counter
CSeismograph
DSpectroscope

Q14The deficiency of which hormone causes diabetes mellitus?

AAdrenaline
BInsulin
CThyroxine
DGrowth hormone

Q15Which of the following is a semiconductor used widely in electronics?

ACopper
BSilicon
CRubber
DGlass

Q16Night-vision devices used by security forces typically detect:

AUltraviolet rays
BInfrared (heat) radiation
CX-rays
DGamma rays

Q17Which acid is present in vinegar?

ACitric acid
BAcetic acid
CLactic acid
DFormic acid

Q18 (assertion-reason). Assertion (A): Tear gas used in crowd control causes irritation of the eyes. Reason (R): Tear gas agents stimulate the nerves in the eyes and respiratory tract, causing watering and discomfort.

(a) Both A and R are true, and R is the correct explanation of A
(b) Both A and R are true, but R is not the correct explanation of A
(c) A is true, R is false
(d) A is false, R is true

Q19The first Indian satellite, launched in 1975, was named:

ABhaskara
BAryabhata
CRohini
DINSAT-1A

Q20Which part of the electromagnetic spectrum is used in radar systems?

AVisible light
BRadio waves (microwaves)
CGamma rays
DX-rays

Q21The deficiency of which nutrient causes kwashiorkor in children?

ACarbohydrates
BProtein
CFat
DWater

Q22Which gas is mainly used in fire extinguishers to put out fires?

AOxygen
BCarbon dioxide
CHydrogen
DNitrogen only

Q23The reddish-brown gas that is a major component of vehicular pollution is:

ACarbon dioxide
BNitrogen dioxide
COxygen
DHelium

Q24Which scientist developed the theory of evolution by natural selection?

AGregor Mendel
BCharles Darwin
CLouis Pasteur
DAlexander Fleming

Q25A drone (unmanned aerial vehicle) used for surveillance is controlled mainly through:

AMechanical cables
BRadio signals and GPS
CSound waves
DHydraulic pressure

Answer key

Reveal the answer key and full worked solutions

Q	Answer
1	(b) 9.8 m/s²
2	(b) O3
3	(b) Nucleus
4	(c) BrahMos
5	(c) Malaria
6	(b) Geostationary orbit
7	(a) Methane
8	(b) Vitamin B12
9	(b) Uranium
10	(d) 1, 2 and 3
11	(b) Hydrogen sulphide
12	(b) Kevlar
13	(b) Geiger counter
14	(b) Insulin
15	(b) Silicon
16	(b) Infrared (heat) radiation
17	(b) Acetic acid
18	(a) Both true, R is the correct explanation
19	(b) Aryabhata
20	(b) Radio waves (microwaves)
21	(b) Protein
22	(b) Carbon dioxide
23	(b) Nitrogen dioxide
24	(b) Charles Darwin
25	(b) Radio signals and GPS

Explanations

Q1. Standard gravitational acceleration at the Earth's surface is about 9.8 m/s^2. See physics everyday.
Q2. Ozone is O3, a triatomic form of oxygen that shields the Earth from ultraviolet rays. See environment and ecology.
Q3. DNA is concentrated in the nucleus (a small amount also lies in mitochondria). See biotechnology and genetics.
Q4. BrahMos is a supersonic cruise missile developed jointly by India and Russia. See strategic and defence technology.
Q5. Malaria is caused by a protozoan parasite (Plasmodium); polio, measles and chickenpox are viral. See diseases and public health.
Q6. A geostationary satellite orbits at about 35,786 km above the equator and appears fixed over one point. See space and defence technology.
Q7. Methane, produced in marshes by decaying matter, is called marsh gas. See chemistry everyday.
Q8. Vitamin B12 deficiency causes pernicious anaemia (impaired red-cell formation). See nutrition diseases and health.
Q9. India's nuclear plants use uranium (and a thorium fuel cycle is being developed). See strategic and defence technology.
Q10. All three are correct statements of Newton's first, second and third laws. See physics everyday.
Q11. Hydrogen sulphide (H2S) smells of rotten eggs. See chemistry everyday.
Q12. Kevlar, a strong aramid fibre, is used in bulletproof jackets and helmets. See strategic and defence technology.
Q13. A Geiger counter (Geiger-Muller counter) detects and measures ionising radiation. See physics everyday.
Q14. A lack of insulin (or resistance to it) raises blood sugar, causing diabetes mellitus. See human body and systems.
Q15. Silicon is the most widely used semiconductor in electronic chips. See information technology and computing.
Q16. Night-vision and thermal-imaging devices detect infrared (heat) radiation. See strategic and defence technology.
Q17. Vinegar is a dilute solution of acetic acid. See chemistry everyday.
Q18. Both true and correctly linked: lachrymatory (tear gas) agents stimulate sensory nerves in the eyes and airways, causing watering and irritation; their use in crowd control is regulated under human-rights norms on proportionate force. See chemistry everyday.
Q19. Aryabhata, India's first satellite, was launched in 1975. See space and defence technology.
Q20. Radar uses radio waves (microwaves) and times their echoes to locate objects. See physics everyday.
Q21. Kwashiorkor is a severe protein-deficiency disorder in children. See nutrition diseases and health.
Q22. Carbon dioxide is heavier than air and smothers the fire by cutting off oxygen. See chemistry everyday.
Q23. Nitrogen dioxide (NO2) is a reddish-brown gas from vehicle exhaust contributing to smog. See environment and ecology.
Q24. Charles Darwin proposed evolution by natural selection in On the Origin of Species (1859). See biology cell and classification.
Q25. Surveillance drones are controlled by radio signals and navigate using GPS. See emerging technologies ai nanotech robotics.

Cross-references

Framework and honesty rule: 00 pipeline
General science module index: Index
More sets: set 01, set 02, set 03, set 04

← BackAll of Practice Sets