Quiz  /  Dispersion of Light Class 12 MCQ Questions With Answers

  • 1. 
    Glass has a _____________ index of refraction than air.

  • Equal
  • Greater
  • Less
  • Impossible to say

  • 2. 
    According to Willebord Snell, light passing from air to glass will cause the light to

  • maintain its original speed
  • accelerate while it is in glass
  • increase its speed
  • reduce its speed

  • 3. 
    How does light behave as it enters these mediums?

  • continue its path as straight line.
  • bends toward the normal
  • bends away from the normal
  • reflects

  • 4. 
    Light changes speed as it travels through various mediums. What are examples of mediums that light can travel through.

  • snow and ice
  • air and water
  • cloth and wood
  • glass and wood

  • 5. 
    Light bending as it passes through a rain drop is an example of...

  • Refraction
  • Reflection

  • 6. 
    What form does light travel in?

  • Curved line
  • Zig-Zag
  • Straight Line

  • 7. 
    What causes light to appear refracted?

  • temperature
  • speed
  • weather
  • climate

  • 8. 
    What is this called?

  • refraction
  • reflection
  • reconstroction
  • retraction

  • 9. 
    Critical angle is the angle of incidence that produces an angle of refraction at......

  • 180 degrees
  • 90 degrees
  • 20 degrees
  • 120 degrees

  • 10. 
    Light travels through a liquid at 2.25 EE 8 m/s. What is the index of the liquid?

  • 1.33
  • 1.0
  • 1.523
  • 2.45

  • 11. 
    If the angle of incidence of light traveling through air, and then striking water is 30 degrees what is the angle of refraction? (n=1 air, n=1.33 water)

  • 15 degrees
  • 22 degrees
  • 43 degrees
  • 17 degrees

  • 12. 
    A ray of light traveling from air into crown glass strikes the surface at an angle of 30 degrees. What is the angle of refraction? (air n=1, crown glass n=1.532)

  • 39.7 degrees
  • 19.2 degrees
  • 59.1 degrees
  • 12.3 degrees

  • 13. 
    The pictures shows what a student observed when he looked through a hand lens at a penny.What happens to light passing through a hand lens that makes the image of the penny appear larger? The light is-

  • absorbed
  • reflected
  • refracted
  • stopped

  • 14. 
    Swimming pools and the ocean look shallower than they really are due to:

  • reflection
  • dispersion
  • refraction
  • total internal reflection

  • 15. 
    Light bending as it passes from one medium (object) to another is...

  • Refraction
  • Reflection

  • 16. 
    Light has the lowest velocity in which medium?flint glass n=1.70barium glass n=1.60crown glass n=1.523water n=1.33diamond n=2.45

  • diamond
  • water
  • flint glass
  • barium glass

  • 17. 
    A student placed a pencil in a cup of water. The pencil appears broken because light-

  • always travels in a straight line
  • bends when it passes through water
  • makes the water in the glass evaporate
  • reflects the pencil on the water's surface

  • 18. 
    Total internal reflection is the complete reflection of a light ray back into its original medium.

  • true
  • false

  • 19. 
    Absolute refractive index of any medium is always _______.

  • less than 1
  • greater than 1
  • 1
  • 0

  • 20. 
    The velocity of light in vacuum is _______ ms(-1)

  • 3x108
  • 3x1012
  • 3x106
  • 3x1010

  • 21. 
    Allows ALL light to pass through

  • transparent
  • translucent
  • opaque
  • clear

  • 22. 
    Does not allow any light to pass through

  • transparent
  • translucent
  • opaque
  • clear

  • 23. 
    Only allows SOME light to pass through

  • transparent
  • translucent
  • opaque
  • clear

  • 24. 
    The spreading of light into the colours of the rainbow

  • reflection
  • refraction
  • dispersion
  • echo

  • 25. 
    A reflection of sound

  • reflection
  • refraction
  • dispersion
  • echo

  • 26. 
    The bending of light that make matter APPEAR to change shape or size.

  • reflect
  • refract
  • disperse
  • echo

  • 27. 
    Matter that light travels through.

  • matter
  • stuff
  • medium
  • space

  • 28. 
    It the bouncing back of light from a surface

  • reflection
  • refraction
  • dispersion
  • echo

  • 29. 
    What is the index of refraction of a refractive liquid if the angle of incidence in the air is 35 degrees and the angle of refraction is 14 degrees?

  • 1.33
  • 2.21
  • 2.37
  • 1.72

  • 30. 
    Light waves bounce off at many of angles because the surface is uneven.

  • reflection
  • refraction
  • dispersion
  • echo
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