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Light

198 MCQ questions with answers and explanations · page 4 of 8

Test yourself▶ 25 question test▶ 50 question test

Q76. What is the colour of the light emitted by the Sun?

  1. AWhite
  2. BRed
  3. CYellow
  4. Dorange
Show answer & explanation

Answer: A) White

Q77. The colour of light is determined by its-

  1. ABy dimension
  2. Bby wavelength
  3. Cintensely
  4. Dwith speed
Show answer & explanation

Answer: B) by wavelength

Q78. An air bubble in water will act in the same way as it does-

  1. Aconvex mirror
  2. Bconvex lens
  3. Cconcave mirror
  4. Dconcave lens
Show answer & explanation

Answer: D) concave lens

Q79. A lens has a power of 2.0 D. What does D stand for here?

  1. Adilation
  2. BDistance
  3. CDiopter
  4. Ddegree
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Answer: C) Diopter

Q80. Diopter is the unit of what?

  1. Apower of the lens
  2. Bfocal length of the lens
  3. Cof the intensity of light
  4. Dintensity of sound
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Answer: A) power of the lens

Q81. Sunglasses have the power to

  1. A0 diopters
  2. B1 diopter
  3. C2 diopters
  4. D4 diopters
Show answer & explanation

Answer: A) 0 diopters

Q82. The focal length of a lens is 25 cm. Its power will be-

  1. A+2D
  2. B+4D
  3. C-2 D
  4. D4D
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Answer: B) +4D

Q83. The focal length of a convex lens is 0.2 m. Its power will be-

  1. A+2 D
  2. B2D
  3. C4D
  4. D+5 D
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Answer: D) +5 D

Q84. If the power of the lens of a spectacle is + 2 diopters, then its focal length will be-

  1. A200 cm
  2. B100 cm
  3. C50 cm
  4. D2 cm
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Answer: C) 50 cm

Q85. When a convex lens is immersed in water, its capacity-

  1. Adecreases
  2. Bincreases
  3. Cremains unchanged
  4. Dnone of these
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Answer: A) decreases

Q86. The splitting of different colours of light in a prism is called-

  1. Areflection of light
  2. Brefraction of light
  3. CDiffraction of light
  4. Ddispersion of light
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Answer: D) dispersion of light

Q87. On passing through a prism, the rays of sunlight get divided into different colours.

  1. Alight rays are electromagnetic waves
  2. BThe rays diverge at the two surfaces of the prism.
  3. CThe rays are refracted on the two surfaces of the prism.
  4. DRays of different colours have different deviations.
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Answer: D) Rays of different colours have different deviations.

Q88. How many colours is white light made up of?

  1. A3
  2. B4
  3. C5
  4. D7
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Answer: D) 7

Q89. When white light passes through a prism, the colour that gets deviated the most is-

  1. ARed
  2. BPurple
  3. CYellow
  4. Dsky blue
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Answer: B) Purple

Q90. Which of the following colours of light diverges the least through a prism?

  1. ARed
  2. BGreen
  3. CPurple
  4. DYellow
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Answer: A) Red

Q91. The primary colour is-

  1. Acolors found in nature
  2. Brainbow colors
  3. Ccolors of the spectrum of white light
  4. DColors that cannot be produced by mixing other colors.
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Answer: D) Colors that cannot be produced by mixing other colors.

Q92. There are three basic colours-

  1. Agreen, yellow, red
  2. BBlue, Yellow, Red
  3. CBlue, Red, Green
  4. DBlue, Yellow, Green
Show answer & explanation

Answer: C) Blue, Red, Green

Q93. The process of separation of white light into its different colours is called-

  1. Ascattering
  2. Bdispersion
  3. CDiffraction
  4. Dcharacter deflection
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Answer: D) character deflection

Q94. Which of the following is not a primary colour?

  1. AGreen
  2. BYellow
  3. CRed
  4. DBlue
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Answer: B) Yellow

Q95. Which of the following colours has the maximum wavelength?

  1. ABlue
  2. BYellow
  3. CGreen
  4. DRed
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Answer: D) Red

Q96. Which of the following colour combinations is most convenient during day and night?

  1. AOrange and blue
  2. Bwhite and black
  3. CYellow and Blue
  4. Dred and green
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Answer: D) red and green

Q97. The colour of an opaque object is due to the colour it gives off.

  1. Aabsorbs
  2. Brefracts
  3. Creflects
  4. Dscatters
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Answer: C) reflects

Q98. How will a plant with green leaves look when kept in red light?

  1. AGreen
  2. BPurple
  3. CBlack
  4. DRed
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Answer: C) Black

Q99. Some transport vehicles have additional yellow lights. This is done because:

  1. AThe vehicle looks beautiful when the light is yellow.
  2. BYellow light consumes less electrical energy
  3. CYellow light penetrates fog, making the road clearer, so yellow lights are useful on foggy nights.
  4. DYellow light does not glare at the eyes of people walking on the road
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Answer: C) Yellow light penetrates fog, making the road clearer, so yellow lights are useful on foggy nights.

Q100. There are seven colors in light. What is the method for separating the colors?

  1. Aprism can separate colors.
  2. BColors can be separated with filters.
  3. CThe colors can be varied with peaches.
  4. DThe colors cannot be distinguished
Show answer & explanation

Answer: A) prism can separate colors.

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