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General Science Practice Set 03

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

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PaperPaper ISubjectGeneral Science

Authored practice, not a verbatim PYQ. Twenty-five CAPF-level questions across everyday physics, chemistry, and biology. Attempt closed-book, then check the key and explanations.

Questions

Q1Which of the following is a vector quantity?
  1. AMass
  2. BDistance
  3. CVelocity
  4. DTemperature
Q2The chemical formula of methane is:
  1. ACH4
  2. BCO2
  3. CC2H6
  4. DCH3OH
Q3Which organ in the human body stores bile?
  1. ALiver
  2. BGall bladder
  3. CPancreas
  4. DSpleen
Q4The phenomenon by which white light splits into seven colours is called:
  1. AReflection
  2. BRefraction
  3. CDispersion
  4. DScattering
Q5Which gas turns lime water milky?
  1. AOxygen
  2. BCarbon dioxide
  3. CHydrogen
  4. DNitrogen
Q6The deficiency of vitamin B1 (thiamine) causes:
  1. AScurvy
  2. BBeriberi
  3. CRickets
  4. DNight blindness
Q7Which subatomic particle carries a negative charge?
  1. AProton
  2. BNeutron
  3. CElectron
  4. DPositron
Q8The branch of biology that deals with the study of heredity is:
  1. AEcology
  2. BGenetics
  3. CCytology
  4. DTaxonomy
Q9Which of the following is used as a coolant in nuclear reactors?
  1. APetrol
  2. BHeavy water
  3. CKerosene
  4. DCarbon dioxide only
Q10The colour of the sky appears blue because of:
  1. AReflection of blue oceans
  2. BScattering of shorter wavelengths (Rayleigh scattering)
  3. CAbsorption of red light
  4. DRefraction by clouds
Q11Which acid is found in lemon and citrus fruits?
  1. AAcetic acid
  2. BCitric acid
  3. CLactic acid
  4. DTartaric acid
Q12The largest gland in the human body is the:
  1. APancreas
  2. BLiver
  3. CThyroid
  4. DPituitary

Q13 (statement-based). Consider the following:

  1. Diamond and graphite are both allotropes of carbon.
  2. Diamond is a good conductor of electricity.
  3. Graphite is used as a dry lubricant. Which are correct?
  • (a) 1 and 2 only
  • (b) 1 and 3 only
  • (c) 2 and 3 only
  • (d) 1, 2 and 3
Q14Which device converts mechanical energy into electrical energy?
  1. AElectric motor
  2. BGenerator (dynamo)
  3. CTransformer
  4. DBattery
Q15The malaria parasite is transmitted to humans by:
  1. AHousefly
  2. BFemale Anopheles mosquito
  3. CTsetse fly
  4. DSandfly
Q16Which of the following is an example of a chemical change?
  1. AMelting of ice
  2. BBoiling of water
  3. CBurning of paper
  4. DDissolving sugar in water
Q17The unit of frequency is the:
  1. ADecibel
  2. BHertz
  3. CNewton
  4. DJoule
Q18The pigment that gives green colour to plants is:
  1. AHaemoglobin
  2. BChlorophyll
  3. CMelanin
  4. DCarotene

Q19 (assertion-reason). Assertion (A): It is easier to roll a barrel than to lift it. Reason (R): Rolling friction is generally much less than sliding friction.

  • (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
Q20Which vitamin helps in the clotting of blood?
  1. AVitamin A
  2. BVitamin C
  3. CVitamin D
  4. DVitamin K
Q21Stainless steel is an alloy of iron with:
  1. ACarbon and tin
  2. BChromium and nickel
  3. CCopper and zinc
  4. DLead and tin
Q22The process of conversion of a solid directly into vapour without melting is:
  1. AEvaporation
  2. BCondensation
  3. CSublimation
  4. DFreezing
Q23Which part of the brain controls balance and coordination of the body?
  1. ACerebrum
  2. BCerebellum
  3. CMedulla oblongata
  4. DHypothalamus
Q24Bronze is an alloy of:
  1. ACopper and zinc
  2. BCopper and tin
  3. CIron and carbon
  4. DAluminium and copper
Q25Which of the following diseases is caused by a virus?
  1. ATuberculosis
  2. BCholera
  3. CDengue
  4. DTyphoid

Answer key

Reveal the answer key and full worked solutions
Q Answer
1 (c) Velocity
2 (a) CH4
3 (b) Gall bladder
4 (c) Dispersion
5 (b) Carbon dioxide
6 (b) Beriberi
7 (c) Electron
8 (b) Genetics
9 (b) Heavy water
10 (b) Scattering of shorter wavelengths
11 (b) Citric acid
12 (b) Liver
13 (b) 1 and 3 only
14 (b) Generator (dynamo)
15 (b) Female Anopheles mosquito
16 (c) Burning of paper
17 (b) Hertz
18 (b) Chlorophyll
19 (a) Both true, R is the correct explanation
20 (d) Vitamin K
21 (b) Chromium and nickel
22 (c) Sublimation
23 (b) Cerebellum
24 (b) Copper and tin
25 (c) Dengue

Explanations

  • Q1. Velocity has both magnitude and direction, so it is a vector; mass, distance and temperature are scalars. See physics everyday.
  • Q2. Methane is CH4, the simplest hydrocarbon and main component of natural gas. See chemistry everyday.
  • Q3. Bile, made by the liver, is stored and concentrated in the gall bladder. See human body and systems.
  • Q4. Dispersion splits white light into the spectrum, as seen in a prism or rainbow. See physics everyday.
  • Q5. Carbon dioxide turns lime water milky by forming insoluble calcium carbonate. See chemistry everyday.
  • Q6. Thiamine (vitamin B1) deficiency causes beriberi, affecting the nerves and heart. See nutrition diseases and health.
  • Q7. The electron carries a negative charge; the proton is positive and the neutron is neutral. See chemistry everyday.
  • Q8. Genetics is the study of heredity and variation. See biotechnology and genetics.
  • Q9. Heavy water (deuterium oxide) acts as a moderator and coolant in many reactors. See strategic and defence technology.
  • Q10. Blue light has a shorter wavelength and is scattered more by air molecules (Rayleigh scattering), making the sky look blue. See physics everyday.
  • Q11. Citric acid is the main acid in lemons and other citrus fruits. See chemistry everyday.
  • Q12. The liver is the largest gland and the largest internal organ. See human body and systems.
  • Q13. Statements 1 and 3 are correct. Diamond does not conduct electricity (no free electrons), so statement 2 is wrong; graphite does conduct and is a lubricant. See chemistry everyday.
  • Q14. A generator (dynamo) converts mechanical energy into electrical energy; a motor does the reverse. See physics everyday.
  • Q15. The malaria parasite (Plasmodium) is spread by the bite of the female Anopheles mosquito. See diseases and public health.
  • Q16. Burning of paper produces new substances (ash, gases) and is irreversible, so it is a chemical change; the others are physical changes. See chemistry everyday.
  • Q17. Frequency is measured in hertz (cycles per second). See physics everyday.
  • Q18. Chlorophyll is the green pigment that absorbs light for photosynthesis. See biology cell and classification.
  • Q19. Both true and correctly linked: rolling friction is much smaller than sliding friction, so rolling a barrel needs less force. See physics everyday.
  • Q20. Vitamin K is essential for the synthesis of clotting factors in blood. See nutrition diseases and health.
  • Q21. Stainless steel is iron alloyed mainly with chromium (and often nickel) to resist rust. See chemistry everyday.
  • Q22. Sublimation is the direct change from solid to vapour, as in camphor or dry ice. See chemistry everyday.
  • Q23. The cerebellum controls balance, posture and coordination of voluntary movement. See human body and systems.
  • Q24. Bronze is an alloy of copper and tin; brass is copper and zinc. See chemistry everyday.
  • Q25. Dengue is a viral disease spread by Aedes mosquitoes; tuberculosis, cholera and typhoid are bacterial. See diseases and public health.

Cross-references

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