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General Science Practice Set 07

Authored CAPF-level general science MCQs (physics, chemistry, biology, defence and space) 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, with a few on space and defence technology relevant to the forces. Attempt closed-book, then check the key and explanations.

Questions

Q1The bending of light as it passes from one medium to another is called:
  1. AReflection
  2. BRefraction
  3. CDiffraction
  4. DDispersion
Q2Which of the following is the lightest element?
  1. AHelium
  2. BHydrogen
  3. COxygen
  4. DNitrogen
Q3The green pigment in plants responsible for photosynthesis is:
  1. AHaemoglobin
  2. BChlorophyll
  3. CCarotene
  4. DMelanin
Q4The Indian air-to-air and surface-to-air missile system meant to defend against aircraft is the:
  1. ABrahMos
  2. BAkash
  3. CAgni
  4. DSagarika
Q5Which mineral is required for the formation of haemoglobin in blood?
  1. ACalcium
  2. BIron
  3. CIodine
  4. DSodium
Q6The mirror used as a rear-view mirror in vehicles is a:
  1. APlane mirror
  2. BConcave mirror
  3. CConvex mirror
  4. DCylindrical mirror
Q7Which gas is the most abundant in the Earth's atmosphere?
  1. AOxygen
  2. BCarbon dioxide
  3. CNitrogen
  4. DArgon
Q8The largest gland in the human body is the:
  1. APancreas
  2. BLiver
  3. CThyroid
  4. DSalivary gland
Q9India's regional satellite navigation system is called:
  1. AGAGAN
  2. BNavIC
  3. CGLONASS
  4. DGalileo

Q10 (statement-based). Consider the following about acids and bases:

  1. Acids turn blue litmus red.
  2. Bases turn red litmus blue.
  3. A neutral solution has a pH of 7. Which are correct?
  • (a) 1 and 2 only
  • (b) 2 and 3 only
  • (c) 1 and 3 only
  • (d) 1, 2 and 3
Q11The phenomenon by which white light splits into its component colours is called:
  1. AReflection
  2. BRefraction
  3. CDispersion
  4. DAbsorption
Q12Radar-absorbent coatings on stealth aircraft work mainly by:
  1. AReflecting all radar waves back
  2. BAbsorbing radar waves so little is reflected to the enemy
  3. CIncreasing the aircraft's weight
  4. DProducing loud sounds
Q13The SI unit of force is the:
  1. AJoule
  2. BNewton
  3. CPascal
  4. DWatt
Q14Which part of the human brain controls balance and coordination?
  1. ACerebrum
  2. BCerebellum
  3. CMedulla oblongata
  4. DHypothalamus
Q15Which of the following is a noble (inert) gas?
  1. AChlorine
  2. BNeon
  3. CHydrogen
  4. DOxygen
Q16Solar cells convert which form of energy directly into electricity?
  1. AHeat energy
  2. BLight energy
  3. CSound energy
  4. DChemical energy
Q17Quicklime is chemically:
  1. ACalcium carbonate
  2. BCalcium oxide
  3. CCalcium hydroxide
  4. DCalcium chloride

Q18 (assertion-reason). Assertion (A): A swimmer pushes water backward to move forward. Reason (R): This is an example of Newton's third law of motion.

  • (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
Q19India's first indigenously built nuclear-powered submarine is:
  1. AINS Vikrant
  2. BINS Arihant
  3. CINS Vikramaditya
  4. DINS Viraat
Q20The ozone layer is located mainly in the:
  1. ATroposphere
  2. BStratosphere
  3. CMesosphere
  4. DExosphere
Q21Scurvy is caused by the deficiency of:
  1. AVitamin A
  2. BVitamin B
  3. CVitamin C
  4. DVitamin K
Q22Which device converts mechanical energy into electrical energy?
  1. AMotor
  2. BGenerator
  3. CTransformer
  4. DBattery
Q23The greenhouse gas most responsible for global warming due to human activity is:
  1. AOxygen
  2. BCarbon dioxide
  3. CNitrogen
  4. DHelium
Q24The scientist who proposed the laws of planetary motion was:
  1. AGalileo
  2. BJohannes Kepler
  3. CIsaac Newton
  4. DCopernicus
Q25A bomb-disposal robot used by security forces helps mainly by:
  1. ADetonating bombs faster
  2. BLetting personnel handle suspected devices from a safe distance
  3. CMaking bombs more powerful
  4. DHiding bombs from view

Answer key

Reveal the answer key and full worked solutions
Q Answer
1 (b) Refraction
2 (b) Hydrogen
3 (b) Chlorophyll
4 (b) Akash
5 (b) Iron
6 (c) Convex mirror
7 (c) Nitrogen
8 (b) Liver
9 (b) NavIC
10 (d) 1, 2 and 3
11 (c) Dispersion
12 (b) Absorbing radar waves so little is reflected to the enemy
13 (b) Newton
14 (b) Cerebellum
15 (b) Neon
16 (b) Light energy
17 (b) Calcium oxide
18 (a) Both true, R is the correct explanation
19 (b) INS Arihant
20 (b) Stratosphere
21 (c) Vitamin C
22 (b) Generator
23 (b) Carbon dioxide
24 (b) Johannes Kepler
25 (b) Letting personnel handle suspected devices from a safe distance

Explanations

  • Q1. Refraction is the bending of light when it crosses a boundary between media of different optical density. See physics everyday.
  • Q2. Hydrogen, with one proton, is the lightest element. See chemistry everyday.
  • Q3. Chlorophyll absorbs light energy to drive photosynthesis. See biology cell and classification.
  • Q4. Akash is an Indian medium-range surface-to-air missile system used for air defence. See strategic and defence technology.
  • Q5. Iron is a key component of haemoglobin, the oxygen-carrying pigment of red blood cells. See nutrition diseases and health.
  • Q6. A convex mirror gives a wider, upright field of view, ideal for rear-view mirrors. See physics everyday.
  • Q7. Nitrogen makes up about 78 percent of the atmosphere by volume. See environment and ecology.
  • Q8. The liver is the largest gland (and largest internal organ) in the human body. See human body and systems.
  • Q9. NavIC (Navigation with Indian Constellation) is India's regional satellite navigation system. See space and defence technology.
  • Q10. All three are correct: acids turn blue litmus red, bases turn red litmus blue, and a neutral solution has pH 7. See chemistry everyday.
  • Q11. Dispersion splits white light into its colours, as seen in a prism or a rainbow. See physics everyday.
  • Q12. Radar-absorbent materials soak up incident radar energy so very little is reflected back, reducing the radar signature. See strategic and defence technology.
  • Q13. The newton (N) is the SI unit of force. See physics everyday.
  • Q14. The cerebellum controls balance, posture and the fine coordination of movement. See human body and systems.
  • Q15. Neon is a noble (inert) gas; chlorine, hydrogen and oxygen are reactive. See chemistry everyday.
  • Q16. Solar cells (photovoltaic cells) convert light energy directly into electricity. See environment and ecology.
  • Q17. Quicklime is calcium oxide (CaO); slaked lime is calcium hydroxide. See chemistry everyday.
  • Q18. Both true and correctly linked: the backward push on the water produces an equal and opposite forward reaction, illustrating Newton's third law. See physics everyday.
  • Q19. INS Arihant is India's first indigenously built nuclear-powered ballistic-missile submarine. See strategic and defence technology.
  • Q20. The ozone layer lies in the stratosphere and absorbs harmful ultraviolet radiation. See environment and ecology.
  • Q21. Scurvy results from vitamin C (ascorbic acid) deficiency. See nutrition diseases and health.
  • Q22. A generator (dynamo) converts mechanical energy into electrical energy; a motor does the reverse. See physics everyday.
  • Q23. Carbon dioxide from burning fossil fuels is the leading human-emitted greenhouse gas driving global warming. See environment and ecology.
  • Q24. Johannes Kepler formulated the three laws of planetary motion. See space and defence technology.
  • Q25. Bomb-disposal robots let personnel inspect and neutralise suspected explosive devices remotely, keeping operators out of the blast zone. See emerging technologies ai nanotech robotics.

Cross-references

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