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Light

198 MCQ questions with answers and explanations Ā· page 1 of 8

Test yourselfā–¶ 25 question testā–¶ 50 question test

Q1. Light is made up of tiny particles called-

  1. Anuclear
  2. BNeutron
  3. CPositron
  4. Dphoton
Show answer & explanation

Answer: D) photon

Q2. What type of wave is a light wave?

  1. Atransverse
  2. Blongitudinal
  3. Cprogressive
  4. Dsharp
Show answer & explanation

Answer: A) transverse

Q3. The wave theory of light was established by whom?

  1. ANewton
  2. BHuygens
  3. CPlank
  4. DFaraday
Show answer & explanation

Answer: B) Huygens

Q4. Which of the following phenomena helps in deciding that light is a transverse wave?

  1. Ainterference
  2. BDiffraction
  3. Cpolarization
  4. DRefraction
Show answer & explanation

Answer: C) polarization

Q5. Who discovered the electromagnetic nature of light?

  1. ASnell
  2. BNewton
  3. CMaxwell
  4. DYoung
Show answer & explanation

Answer: C) Maxwell

Q6. Who first showed that light waves undergo diffraction?

  1. Agremandy
  2. BYoung
  3. CMaxwell
  4. DFoucault
Show answer & explanation

Answer: A) gremandy

Q7. Photoelectric effect was propounded by-

  1. ACompton
  2. BMaxwell
  3. CEinstein
  4. DNewton
Show answer & explanation

Answer: C) Einstein

Q8. Which of the following phenomena does not occur in both light and sound?

  1. ADiffraction
  2. Bpolarization
  3. Creflection
  4. DRefraction
Show answer & explanation

Answer: B) polarization

Q9. The bending of light from the edge of an obstacle is called-

  1. Adeflection
  2. BDiffraction
  3. CRefraction
  4. Dinterference
Show answer & explanation

Answer: B) Diffraction

Q10. Which of the following theories confirms the wave nature of light?

  1. ANewton's corpuscular theory
  2. BTheory of interference
  3. Celectromagnetic wave theory of light
  4. Dnone of these
Show answer & explanation

Answer: B) Theory of interference

Q11. The nature of light radiation is-

  1. Awave-like
  2. Bparticle-like
  3. Clike both waves and particles
  4. Dnot like a wave or a particle
Show answer & explanation

Answer: C) like both waves and particles

Q12. The phenomenon of light bouncing back after striking a smooth surface is called-

  1. Arefraction of light
  2. Breflection of light
  3. CDiffraction of light
  4. Dscattering of light
Show answer & explanation

Answer: B) reflection of light

Q13. The phenomenon of polarization in light proves that light waves are-

  1. Asharp
  2. Bprogressive
  3. Ctransverse
  4. Dlongitudinal
Show answer & explanation

Answer: C) transverse

Q14. The Sun is radiating energy at a rate of approximately 4 x 1026 joules per second. At what rate is the Sun's mass decreasing as it releases so much energy?

  1. A4Ɨ107 kg sāˆ’1
  2. B4Ɨ19 kg s-1
  3. C4Ɨ1011 kg sāˆ’1
  4. D4Ɨ1013 kg s-1
Show answer & explanation

Answer: B) 4Ɨ19 kg s-1

Q15. Who first discovered the speed of light?

  1. AGalileo
  2. BNewton
  3. CRomer
  4. DMichaelson
Show answer & explanation

Answer: C) Romer

Q16. In which is the velocity of light maximum?

  1. Adiamonds
  2. BWater
  3. Cvacuum
  4. Dhydrogen
Show answer & explanation

Answer: C) vacuum

Q17. With increase in temperature of the medium, the speed of light-

  1. Aincreases
  2. Bdecreases
  3. CIt remains the same
  4. Dusually falls down
Show answer & explanation

Answer: C) It remains the same

Q18. The speed of light in water, glass and diamond is in the following order:

  1. ADiamond > Glass > Water
  2. BWater > Glass > Diamond
  3. CGlass > Diamond > Water
  4. DDiamond > Water > Glass
Show answer & explanation

Answer: B) Water > Glass > Diamond

Q19. Approximately how much time does it take for light to travel from the Moon to the Earth?

  1. A8 minutes
  2. B8 seconds
  3. C1 second
  4. D100 seconds
Show answer & explanation

Answer: C) 1 second

Q20. Approximately how much time does it take for sunlight to reach us?

  1. A8 minutes
  2. B2 minutes
  3. C6 minutes
  4. D4 minutes
Show answer & explanation

Answer: A) 8 minutes

Q21. The velocity of light is-

  1. A3x108 cm/sec
  2. B3 x 10 8m/sec
  3. C3x108 km/sec
  4. D3 x 108mile/sec
Show answer & explanation

Answer: B) 3 x 10 8m/sec

Q22. Which part of the Sun is visible during a solar eclipse?

  1. Achromosphere
  2. Bcrown or corona
  3. Chalo
  4. DNo parts
Show answer & explanation

Answer: B) crown or corona

Q23. The maximum duration of a total solar eclipse is-

  1. A250 seconds
  2. B460 seconds
  3. C500 seconds
  4. D600 seconds
Show answer & explanation

Answer: B) 460 seconds

Q24. Solar eclipse occurs when-

  1. AThe moon is in the middle
  2. BThe earth is in the middle
  3. Cthe sun is in the middle
  4. DThe Sun, Moon and Earth are in a straight line and Jupiter is not in that line
Show answer & explanation

Answer: A) The moon is in the middle

Q25. Lunar eclipse occurs in-

  1. Aon the new moon day
  2. Bfull moon day
  3. CNew moon and full moon days
  4. Dcrescent moon day
Show answer & explanation

Answer: B) full moon day

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