Class 8 Science light

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Light

 Multiple Choice Questions (MCQs)

 1. When white light passes through a prism it is

(c) deviated and dispersed

  1. The phenomenon by which light falling on a surface is sent back into the same medium is known as

(c) reflection.

  1. When light is incident on a polished surface __________ reflection takes place.

(a) regular

  1. The coloured part of the eye is the

(c) pupil.

  1. The amount of light entering the eye is controlled by the

(a) pupil.

  1. The least distance of distinct vision for a young adult with normal vision is about

(b) 25 cm.

  1. Light with the lowest frequency (longest wavelength) detected by your eyes is perceived as

(d) red.

  1. Which of the following is not a part of the human eye?

(c) Auditory nerve.

  1. The size of the pupil of the eye is adjusted by

(c) ciliary muscles.

  1. Which of the following is used to make a periscope?

(b) Plane mirror.

  1. The image formed by a plane mirror is

(b) virtual, behind the mirror and of the same size as the object.

  1. The defect of vision in which the eye lens of a person gets progressively cloudy resulting in blurred vision is called:

(c) cataract.

  1. The deficiency of one of the following in the diet of a person for a considerable time can lead to a disease called night blindness. This one is

(b) vitamin A.

  1. Which can be corrected by using a concave lens of suitable focal length?

(a) Myopia

  1. Fill in the blanks:

 

  1. The blind spot is located where the optic nerve leaves the eye.
  1. The size of pupil becomes large when you see in dim light.
  1. The angle of incidence equals the angle of reflection.
  1. The muscles alter (adjust) the of the eye lens.
  1. The spectrum of white light has seven colours.
  1. In old people, the eye lens may become cloudy due to cataract.
  1. Droplets of water split sunlight to form a spectrum known as the rainbow.
  1. The optic nerve carries the impression on the retina to the brain.

State whether ‘True’ (T) or ‘False’ (F):

  1. A moon is a luminous object. False
  1. The pupil is black because it absorbs all light that falls on it. False
  1. There are no light-sensitive cells in the blind spot in the eye. True
  1. The Braille system consists of writing raised. True
  1. Rubbing the eye is the best way of removing a dust particle from the eye. False
  1. In Kaleidoscope, a beautiful pattern is created. True
  1. Eyes alone cannot see the object. True

 

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