10th Standard CBSE - Science - The Human Eye and the Colourful World

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Question - 1

The human eye can focus object at different disrtances by adjusting the focal length of the eye lens.This is due to

  • A Presbyopia
  • B Accommodation
  • C Near sightedness
  • D Far sightedness

Question - 2

The human eye forms the image of an object at its

  • A Cornea
  • B Iris
  • C Pupil
  • D Retina

Question - 3

The least distance of distinct vision for a young adult with normal vision for a young

  • A 25m
  • B 2.5cm
  • C 25cm
  • D 2.5m

Question - 4

The change in focal length of an eye lens is caused by the action of the

  • A Pupil
  • B Retina
  • C Ciliary muscles
  • D Iris

Question - 5

A person cannot see distinctly object kept beyond 2m.This defect can be corrected by using a lens of power

  • A +0.5D
  • B -0.5D
  • C +0.2D
  • D -0.2D

Question - 6

A student sitting on the bench can read the letters written on the blackboard but is not able to read the letters written in his text book.Which of the following statement is correct?

  • A The near point of his eyes has receded away
  • B The near point of his eyes has come closer to him
  • C The far point of his eyes has come closer him
  • D The far point of his eyes has receded away

Question - 7

At noon the sun appears white as

  • A light is least scattered
  • B all the colours of the white light are scattered away
  • C blue colour is scattered the most
  • D red  colour is scattered the most

Question - 8

Which of the following phenomena of light are involved in the formation of a rainbow?

  • A Reflection, refraction and dispersion
  • B Refraction, dispersion and internal reflection
  • C Refraction, dispersion and internal reflection
  • D Dispersion, scattering and total internal reflection

Question - 9

Twinkling of stars is due to atmospheric

  • A dispersion of light by water droplets
  • B refraction of light by different layers of varying refractive indices
  • C scattering of light by dust particles
  • D internal reflection of light by clouds

Question - 10

The clear sky appears blue because

  • A blue light  gets absorbed in the atmosphere
  • B ultraviolet radiations are absorbed in the atmosphere
  • C violet and blue lights get scattered more than lights of all other colours by the atmosphere
  • D light of all other colours is scattered more than the violet and blue colour lights by the atmosphere