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Light

198 MCQ questions with answers and explanations · page 3 of 8

Test yourself▶ 25 question test▶ 50 question test

Q51. Diffusion of light in the atmosphere is due to the following:

  1. Acarbon dioxide
  2. Bdust particles
  3. Chelium
  4. Dnone of these
Show answer & explanation

Answer: B) dust particles

Q52. An observer on the lunar surface will see the sky during the daytime as-

  1. Alight yellow
  2. BBlue
  3. Corange
  4. DBlack
Show answer & explanation

Answer: D) Black

Q53. A spherical air bubble is embedded in a piece of glass. How does the bubble behave for a ray of light passing through it?

  1. Aplane diverging lens
  2. BDiverging lens
  3. Cplane converging lens
  4. Dconverging lens
Show answer & explanation

Answer: B) Diverging lens

Q54. Red light is used in traffic signals because-

  1. AThe color of blood is red
  2. BAnimals can detect the color red
  3. CRed colour is least dispersed
  4. DRed symbolizes danger
Show answer & explanation

Answer: C) Red colour is least dispersed

Q55. The sea appears blue

  1. ADue to the greater depth
  2. BDue to reflection from the sky and scattering of light by water particles
  3. CDue to the blue colour of the water
  4. Ddue to the surface of the water
Show answer & explanation

Answer: B) Due to reflection from the sky and scattering of light by water particles

Q56. Why does the atmosphere turn red at sunrise and sunset?

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

Answer: D) scattering of light

Q57. Which colour is dispersion more in rainbow?

  1. APurple
  2. BYellow
  3. CRed
  4. DBlue
Show answer & explanation

Answer: A) Purple

Q58. The stars appear higher in the sky than they actually are. What can explain this?

  1. Aatmospheric refraction
  2. BDispersion of light
  3. Ctotal internal reflection
  4. DDiffraction of light
Show answer & explanation

Answer: A) atmospheric refraction

Q59. Why does dry sand appear shiny, while wet sand is dull?

  1. Ait's an optical illusion
  2. BThis is because of reflection
  3. CThis is due to refraction
  4. DThis is due to scattering
Show answer & explanation

Answer: B) This is because of reflection

Q60. Which one of the following is used in making periscope?

  1. Aconcave lens
  2. Bconcave mirror
  3. Cplane mirror
  4. DNone of these
Show answer & explanation

Answer: C) plane mirror

Q61. The formation of bright colours in thin soap foam is the result of which phenomenon?

  1. AMultiple reflection and interference
  2. BMultiple refraction and dispersion
  3. CRefraction and Dispersion
  4. DPolarization and interference
Show answer & explanation

Answer: A) Multiple reflection and interference

Q62. What do vehicles use to see objects coming from behind?

  1. AConvex lacing
  2. Bconcave lens
  3. Cconvex mirror
  4. Dconcave mirror
Show answer & explanation

Answer: C) convex mirror

Q63. Which of the following is not a result of atmospheric refraction?

  1. Athe sun appearing two or three minutes before its actual sunrise
  2. Bthe sun appears red at sunset
  3. CThe sun appears higher in the sky than its actual height
  4. Dtwinkling stars at night
Show answer & explanation

Answer: B) the sun appears red at sunset

Q64. The mirror used by dentists to examine patients' teeth is

  1. AConvex
  2. Bconcave
  3. Ceven
  4. DNone of these
Show answer & explanation

Answer: B) concave

Q65. Which type of mirror is used in the headlights of vehicles?

  1. Aplane mirror
  2. Bconvex mirror
  3. Cconcave mirror
  4. DParabolic mirror
Show answer & explanation

Answer: D) Parabolic mirror

Q66. Used for shaving-

  1. Aconcave mirror
  2. Bplane mirror
  3. Cconvex mirror
  4. Dnone of these
Show answer & explanation

Answer: A) concave mirror

Q67. Which of these is correct?

  1. A1/f=1/u=1/v
  2. Bf=D/2
  3. C1/f-1/u+1/v
  4. Df=u+v
Show answer & explanation

Answer: D) f=u+v

Q68. What is the part of the human eye on which the image is formed called?

  1. Apupil
  2. Bcornea
  3. Cretina
  4. DIris
Show answer & explanation

Answer: A) pupil

Q69. The image formed by the eye on the retina is-

  1. Areal, inverted, small
  2. Breal, upright, large
  3. Creal, straight, small
  4. Dunreal, inverted, small
Show answer & explanation

Answer: B) real, upright, large

Q70. The minimum height of a plane mirror to see the full image of a person is-

  1. Aequal to the height of the person
  2. Bhalf the person's height
  3. Cone-fourth the height of a person
  4. Dtwice the height of the person
Show answer & explanation

Answer: D) twice the height of the person

Q71. If an object is placed between two parallel plane mirrors, then the number of images formed is-

  1. A4
  2. B1
  3. C2
  4. Dinfinite
Show answer & explanation

Answer: B) 1

Q72. Two plane mirrors are placed at a 90° angle and a candle is burning between them. How many images of the candle will be formed in the mirrors?

  1. A2
  2. B3
  3. C4
  4. Dinfinity
Show answer & explanation

Answer: C) 4

Q73. When three images of an object are to be obtained with the help of plane mirrors, what should be the angle between the mirrors?

  1. A0°
  2. B60°
  3. C90°
  4. D45°
Show answer & explanation

Answer: C) 90°

Q74. If a person stands between two plane mirrors inclined at an angle of 60°, how many images will he see?

  1. A3
  2. B4
  3. C5
  4. D6
Show answer & explanation

Answer: C) 5

Q75. How many images will be formed by two mirrors inclined at 120° to each other?

  1. A4
  2. B3
  3. C2
  4. D1
Show answer & explanation

Answer: C) 2

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