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Light

198 MCQ questions with answers and explanations · page 2 of 8

Test yourself▶ 25 question test▶ 50 question test

Q26. When does a solar eclipse occur?

  1. APratipada (New Moon Day)
  2. Bon the full moon
  3. CQuarter Moon Days
  4. Dany day
Show answer & explanation

Answer: A) Pratipada (New Moon Day)

Q27. Why does a cut diamond sparkle?

  1. ADue to its molecular structure
  2. Bdue to the absorption of light
  3. Cdue to total internal reflection
  4. Ddue to some other inherent quality
Show answer & explanation

Answer: C) due to total internal reflection

Q28. Why does a coin placed in a vessel filled with water appear slightly raised?

  1. Adue to reflection of light
  2. Bdue to refraction of light
  3. Cdue to diffraction of light
  4. Ddue to dispersion of light
Show answer & explanation

Answer: B) due to refraction of light

Q29. To a person sitting suspended in water, his leg appears bent and short.

  1. ACauses of refraction
  2. Bdue to reflection
  3. CCauses of diffraction
  4. Ddue to dispersion
Show answer & explanation

Answer: A) Causes of refraction

Q30. When a compact disc (CD) is viewed in sunlight, a rainbow-like display of colors is seen. This can be explained by—

  1. ABased on the phenomena of reflection and diffraction
  2. BBased on the phenomena of reflection and transmission
  3. CBased on the phenomena of diffraction and transmission
  4. DBased on the phenomena of refraction, diffraction and transmission
Show answer & explanation

Answer: A) Based on the phenomena of reflection and diffraction

Q31. Why does a fish lying inside water appear to be raised slightly above its actual depth?

  1. Adue to diffraction of light
  2. Bdue to refraction of light
  3. Cdue to polarization of light
  4. Ddue to reflection of light
Show answer & explanation

Answer: B) due to refraction of light

Q32. Why does an object above the water surface appear to be at a higher height than its actual position to a person underwater?

  1. Adue to refraction of light
  2. Bdue to reflection of light
  3. Cdue to interference of light
  4. Ddue to diffraction of light
Show answer & explanation

Answer: A) due to refraction of light

Q33. Wood immersed in water appears bent. This appearance is due to the following reasons:

  1. Areflection of light
  2. BDiffraction of light
  3. Crefraction of light
  4. DImmersion of light
Show answer & explanation

Answer: C) refraction of light

Q34. When a ray of light passes from a rarer medium to a denser medium, it-

  1. Amoves in a straight direction
  2. Bbends towards the normal.
  3. Cmoves away from the normal
  4. Dnone of these
Show answer & explanation

Answer: B) bends towards the normal.

Q35. Total internal reflection occurs when light passes through

  1. AFrom a rarer medium to a denser medium, the angle of incidence is called the Kartick angle.
  2. BFrom a denser medium to a rarer medium. With angle of incidence greater than the critical angle
  3. Cfrom a rarer medium to a denser medium
  4. Dfrom denser medium to rarer medium
Show answer & explanation

Answer: B) From a denser medium to a rarer medium. With angle of incidence greater than the critical angle

Q36. What causes a rainbow?

  1. ARefraction and Dispersion
  2. BScattering and refraction
  3. CDiffraction and refraction
  4. DRefraction and reflection
Show answer & explanation

Answer: D) Refraction and reflection

Q37. What is the phenomenon called that creates a mirage?

  1. Ainterference
  2. BDiffraction
  3. Cpolarization
  4. Dtotal internal reflection
Show answer & explanation

Answer: D) total internal reflection

Q38. The technique used to investigate the stomach or other internal organs of the body is based on endoscopy.

  1. Aon the phenomenon of total internal reflection
  2. BOn interference phenomena
  3. COn the phenomenon of diffraction
  4. Don the phenomenon of polarization
Show answer & explanation

Answer: A) on the phenomenon of total internal reflection

Q39. Why does the bottom of a beaker filled with liquid appear slightly raised?

  1. ARefraction
  2. Binterference
  3. CDiffraction
  4. Dreflection
Show answer & explanation

Answer: A) Refraction

Q40. Internal reflection of light from the sun can occur if the light-

  1. Ago from air to glass
  2. Bgo from air to water
  3. Cgo from glass to air
  4. Dgo from water to glass
Show answer & explanation

Answer: C) go from glass to air

Q41. Broken glass appears to be cracked.

  1. ACauses of refraction
  2. Bdue to reflection
  3. Cdue to interference
  4. Ddue to total internal reflection
Show answer & explanation

Answer: D) due to total internal reflection

Q42. Rainbows are formed when sunlight-

  1. ARefraction and internal reflection of light falling on raindrops in the atmosphere
  2. BIt gets reflected and diffused after falling on raindrops suspended in the atmosphere.
  3. Cfalling on raindrops in the atmosphere and gets radiated after refraction
  4. DNone of the given statements is correct
Show answer & explanation

Answer: A) Refraction and internal reflection of light falling on raindrops in the atmosphere

Q43. How many colours does a rainbow show?

  1. A7
  2. B10
  3. C12
  4. D5
Show answer & explanation

Answer: A) 7

Q44. Transmission of light energy in optical fibre is done by the application of the following phenomenon. Transmission of light energy in optical fibre is done by the application of the following phenomenon-

  1. Atotal internal reflection
  2. BDiffraction
  3. Cscattering
  4. DRefraction
Show answer & explanation

Answer: A) total internal reflection

Q45. What does a ray of light traveling from a denser to a rarer medium with an angle of incidence greater than the critical angle of the corresponding mean pair do?

  1. ADiffraction
  2. Btotal internal reflection
  3. CParavan
  4. DRefraction
Show answer & explanation

Answer: B) total internal reflection

Q46. Consider the following statements. Hypermetropia is a defect of vision in which 1. A person cannot see distant objects clearly as the near point of the eye moves away from its normal position. 2. A person cannot see nearby objects clearly as the near point of the eye moves away from its normal position. 3. The near point of the eye moves away from its normal position. 4. The far point of the eye moves towards the eye. Which of the above statements are correct?

  1. Aand 3
  2. B2 and 4
  3. C1 and 4
  4. D2 and 3
Show answer & explanation

Answer: D) 2 and 3

Q47. What is a compound microscope?

  1. AA microscope that has a lens
  2. BA microscope that has two sets of lenses: an ocular lens and an eyepiece
  3. Cconcave microscope
  4. Dconvex microscope
Show answer & explanation

Answer: B) A microscope that has two sets of lenses: an ocular lens and an eyepiece

Q48. Due to what does the sky appear blue?

  1. ARefraction
  2. Breflection
  3. Cscattering
  4. Ddeflection
Show answer & explanation

Answer: C) scattering

Q49. When a ray of light travels from one medium to another, its-

  1. Awavelength remains the same
  2. BThe frequency remains the same
  3. CThe frequency increases
  4. DThe wavelength increases
Show answer & explanation

Answer: B) The frequency remains the same

Q50. The sky appears blue because-

  1. ABlue light is scattered the most.
  2. BRed light is scattered the most.
  3. CBlue light is least absorbed in the atmosphere
  4. DRed light is absorbed the most in the atmosphere.
Show answer & explanation

Answer: A) Blue light is scattered the most.

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