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General Science Practice Set 09

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 work done when no displacement occurs is:
  1. AMaximum
  2. BZero
  3. CNegative
  4. DInfinite
Q2The pH value of a neutral solution at room temperature is:
  1. A0
  2. B7
  3. C10
  4. D14
Q3Which blood cells help in fighting infection?
  1. ARed blood cells
  2. BWhite blood cells
  3. CPlatelets
  4. DPlasma
Q4The anti-tank guided missile developed indigenously by India is called:
  1. AAkash
  2. BNag
  3. CAgni
  4. DPrithvi
Q5Which element is essential for healthy teeth and bones?
  1. AIron
  2. BCalcium
  3. CSodium
  4. DPotassium
Q6Echoes are produced due to which property of sound?
  1. ARefraction
  2. BReflection
  3. CDiffraction
  4. DAbsorption
Q7Which of the following is a metalloid?
  1. ACopper
  2. BSilicon
  3. CIron
  4. DGold
Q8The number of chambers in the human heart is:
  1. ATwo
  2. BThree
  3. CFour
  4. DFive
Q9The first human to travel into space was:
  1. ANeil Armstrong
  2. BYuri Gagarin
  3. CRakesh Sharma
  4. DJohn Glenn

Q10 (statement-based). Consider the following about energy:

  1. Energy can neither be created nor destroyed.
  2. Energy can be transformed from one form to another.
  3. A stretched spring stores potential energy. Which are correct?
  • (a) 1 and 2 only
  • (b) 2 and 3 only
  • (c) 1 and 3 only
  • (d) 1, 2 and 3
Q11Bleaching powder is chemically:
  1. ACalcium hypochlorite
  2. BSodium chloride
  3. CCalcium carbonate
  4. DSodium bicarbonate
Q12Laser range finders used by the armed forces measure distance by timing:
  1. ASound pulses
  2. BReflected light pulses
  3. CRadio static
  4. DWind speed
Q13The energy possessed by a body due to its motion is called:
  1. APotential energy
  2. BKinetic energy
  3. CChemical energy
  4. DNuclear energy
Q14Which gland is known as the master gland of the body?
  1. AThyroid
  2. BPituitary
  3. CAdrenal
  4. DPancreas
Q15Stainless steel is an alloy of iron with chromium and:
  1. ALead
  2. BNickel
  3. CGold
  4. DSilver
Q16Fibre-optic cables carry information in the form of:
  1. ASound waves
  2. BPulses of light
  3. CMagnetic fields
  4. DHeat
Q17Dry ice is the solid form of:
  1. AWater
  2. BCarbon dioxide
  3. CNitrogen
  4. DAmmonia

Q18 (assertion-reason). Assertion (A): Astronauts in orbit appear to float inside the spacecraft. Reason (R): They are in continuous free fall around the Earth along with the spacecraft.

  • (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 to travel into space was:
  1. AKalpana Chawla
  2. BRakesh Sharma
  3. CSunita Williams
  4. DVikram Sarabhai
Q20Which of the following is NOT a part of the electromagnetic spectrum?
  1. AX-rays
  2. BSound waves
  3. CUltraviolet rays
  4. DRadio waves
Q21A deficiency of vitamin K leads to:
  1. APoor blood clotting
  2. BNight blindness
  3. CGoitre
  4. DRickets
Q22Which of the following processes releases energy in the Sun?
  1. ANuclear fission
  2. BNuclear fusion
  3. CCombustion
  4. DElectrolysis
Q23Biodegradable waste is waste that:
  1. ACannot be broken down by microbes
  2. BCan be broken down by microorganisms
  3. CIs always plastic
  4. DIs always metal
Q24The scientist who formulated the theory of relativity was:
  1. AIsaac Newton
  2. BAlbert Einstein
  3. CNiels Bohr
  4. DMax Planck
Q25A jammer used in counter-terror operations works by:
  1. ABoosting enemy radio signals
  2. BFlooding a frequency so enemy radios or remote detonators cannot work
  3. CRecording all calls
  4. DSpeeding up communication

Answer key

Reveal the answer key and full worked solutions
Q Answer
1 (b) Zero
2 (b) 7
3 (b) White blood cells
4 (b) Nag
5 (b) Calcium
6 (b) Reflection
7 (b) Silicon
8 (c) Four
9 (b) Yuri Gagarin
10 (d) 1, 2 and 3
11 (a) Calcium hypochlorite
12 (b) Reflected light pulses
13 (b) Kinetic energy
14 (b) Pituitary
15 (b) Nickel
16 (b) Pulses of light
17 (b) Carbon dioxide
18 (a) Both true, R is the correct explanation
19 (b) Rakesh Sharma
20 (b) Sound waves
21 (a) Poor blood clotting
22 (b) Nuclear fusion
23 (b) Can be broken down by microorganisms
24 (b) Albert Einstein
25 (b) Flooding a frequency so enemy radios or remote detonators cannot work

Explanations

  • Q1. Work equals force times displacement; with zero displacement, the work done is zero. See physics everyday.
  • Q2. A neutral solution has a pH of 7 at room temperature. See chemistry everyday.
  • Q3. White blood cells (leucocytes) defend the body against infection. See human body and systems.
  • Q4. Nag is India's indigenous anti-tank guided missile. See strategic and defence technology.
  • Q5. Calcium is essential for the formation and strength of bones and teeth. See nutrition diseases and health.
  • Q6. An echo is the reflection of sound from a distant surface. See physics everyday.
  • Q7. Silicon is a metalloid with properties between metals and non-metals. See chemistry everyday.
  • Q8. The human heart has four chambers: two atria and two ventricles. See human body and systems.
  • Q9. Yuri Gagarin of the Soviet Union became the first human in space in 1961. See space and defence technology.
  • Q10. All three are correct: energy is conserved, can be transformed, and a stretched spring stores elastic potential energy. See physics everyday.
  • Q11. Bleaching powder is calcium hypochlorite (also written calcium oxychloride). See chemistry everyday.
  • Q12. A laser range finder fires a light pulse and measures the time for its reflection to return, giving the distance. See strategic and defence technology.
  • Q13. Kinetic energy is the energy a body has because of its motion. See physics everyday.
  • Q14. The pituitary gland controls other endocrine glands, so it is called the master gland. See human body and systems.
  • Q15. Stainless steel is an alloy of iron, chromium and nickel that resists corrosion. See chemistry everyday.
  • Q16. Optical fibres transmit data as pulses of light by total internal reflection. See information technology and computing.
  • Q17. Dry ice is solid carbon dioxide, which sublimes directly to gas. See chemistry everyday.
  • Q18. Both true and correctly linked: the spacecraft and its crew fall freely around the Earth together, so the astronauts feel weightless and appear to float. See physics everyday.
  • Q19. Rakesh Sharma became the first Indian in space in 1984 aboard a Soviet mission. See space and defence technology.
  • Q20. Sound is a mechanical wave needing a medium; it is not part of the electromagnetic spectrum. See physics everyday.
  • Q21. Vitamin K is needed for blood clotting, so its deficiency causes prolonged bleeding. See nutrition diseases and health.
  • Q22. The Sun's energy comes from nuclear fusion of hydrogen into helium. See space and defence technology.
  • Q23. Biodegradable waste can be decomposed by microorganisms into simpler substances. See environment and ecology.
  • Q24. Albert Einstein developed the special and general theories of relativity. See physics everyday.
  • Q25. A jammer transmits noise on a frequency band to swamp it, blocking enemy radio communication and the radio signals used to trigger remote-controlled explosives. See strategic and defence technology.

Cross-references

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