Class 10 Human Eye And Colourful World CBSE Questions & Answers

Class 10 · Human Eye And Colourful World

Class 10 Human Eye and Colourful World CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
If an eye has near point at a distance of 0.5m, What is the power of lens required to correct it?
  • A
    2 dioptre
    Correct
  • B
    2.5 dioptre
  • C
    1 dioptre
  • D
    3 dioptre
2
The cause of Astigmatism is
  • A
    None of these
  • B
    Both of these
    Correct
  • C
    Varying curvature in vertical lines
  • D
    Varying curvature in horizontal lines
3
The deviation in the path of ray of light can be produced-
  • A
    By a rectangular glass slab but not by a glass prism
  • B
    Neither by a glass prism nor by rectangular glass slab.
  • C
    By a glass prism but not by rectangular
    Correct
  • D
    By a glass prism as well as a rectangular glass slab
4
The wavelength corresponding to violet, yellow & red light are \(\lambda v,\lambda y{\rm{ and }}\lambda r\) respectively.
  • A
    \(\lambda v > \lambda y{\rm{ > }}\lambda r\)
  • B
    \(\lambda y < \lambda v{\rm{ < }}\lambda r\)
  • C
    \(\lambda v < \lambda y{\rm{ < }}\lambda r\)
    Correct
  • D
    \(\lambda y < \lambda r{\rm{ < }}\lambda v\)
5
When a light passes through a prism, it splits into its component colours. This phenomenon is called.
  • A
    Refraction
  • B
    Spectrum
  • C
    Dispersion
    Correct
  • D
    Reflection
6
What is the observed colour of sky as seen from the moon surface?
  • A
    Blue
  • B
    Black
    Correct
  • C
    Red
  • D
    None of these.
7
What is spectrum-
  • A
    The band of 6 colours
  • B
    The band of 5 colours
  • C
    The band of 7 colours
    Correct
  • D
    None of these
8
When a person is suffering from both myopia and hypermetropia, what type corrective lens are required-
  • A
    Concave
  • B
    Bifocal
    Correct
  • C
    None of these
  • D
    Convex
9
The critical angle for diamond is
  • A
    \({\rm{5}}{0^0}\)
  • B
    \({\rm{2}}{{\rm{4}}^0}\)
    Correct
  • C
    \({\rm{9}}{0^0}\)
  • D
    \({\rm{18}}{0^0}\)
10
Important defect of vision are-
  • A
    Myopia
  • B
    Hypermetropia
  • C
    All of these
    Correct
  • D
    Presbyobia
11
If the person uses spectacles of power + 1.0 Dioptre, What is the nearest distance of distinct vision for him?
  • A
    -298cm
  • B
    +298cm
  • C
    300cm
  • D
    -300cm
    Correct
12
Ability of the eye lens to adjust its focal length is called
  • A
    None of these
  • B
    Accommodation
    Correct
  • C
    Power
  • D
    Adjustment
13
The approximate focal length of the eye lens when the ciliary muscles are fully relaxed
  • A
    2.0 cm
  • B
    1 cm
  • C
    2.5 cm
    Correct
  • D
    1.5 cm
14
Statement A : The focal length of the eye lens is fixed , Statement B : The cornea of the eye can be compared with the shutter of the camera
  • A
    Neither statement A nor statement B is true
    Correct
  • B
    Statement B is true, B is false
  • C
    Statement A is true, B is false
  • D
    Both the Statement A and B are true
15
Phenomenon responsible for twinkling of stars-
  • A
    Regular refraction.
  • B
    Internal refraction
  • C
    None of these
  • D
    Atmospheric refraction
    Correct