CBSE  /  Class 10  /  Science  /  Human Eye and Colourful World

  • 1. 
    The bluish colour of water in deep sea is due to

  • the presence of algae and other plants found in water
  • reflection of sky in water
  • scattering of light
  • absorption of light by the sea

  • 2. 
    When light rays enter the eye, most of the refraction occurs at the

  • crystalline lens
  • outer surface of the cornea
  • iris
  • pupil

  • 3. 
    The focal length of the eye lens increases when eye muscles

  • are relaxed and lens becomes thinner
  • contract and lens becomes thicker
  • are relaxed and lens becomes thicker
  • contract and lens becomes thinner

  • 4. 
    Which of the following statement is correct?

  • A person with myopia can see distant objects clearly.
  • A person with hypermetropia can see nearby objects clearly.
  • A person with myopia can see nearby objects clearly.
  • A person with hypermetropia cannot see distant objects clearly.

  • 5. 
    A student traces the path of a ray through a glass prism for four different values of angle of incidence. On analysing the diagrams he is likely to conclude that the emergent ray

  • is always parallel to the incident ray.
  • is always perpendicular to the incident ray.
  • is always parallel to the refracted ray.
  • always bends at an angle to the direction of incident ray.

  • 6. 
    A student is observing the diagram showing the path of a ray of light passing through a glass prism. He would find that for all angles of incidence the ray of light bends:

  • towards the normal while entering into the prism and away from the normal while emerging out of the prism
  • away from the normal while entering into the prism and towards the normal while emerging out of the prism.
  • away from the normal while entering as well as while emerging out of the prism.
  • towards the normal while entering as well as while emerging out of the prism.

  • 7. 
    In the following diagram, the path of a ray of light passing through a glass prism is shown:

  • X, R and T
  • Y, Q and T
  • X, Q and P
  • Y, Q and P

  • 8. 
    After tracing the path of a ray of light through a glass prism a student marked the angle of incidence (∠i), angle of refraction (∠r), angle of emergence (∠e) and the angle of deviation (∠D) as shown in the diagram. The correctly marked angles are:

  • ∠i and ∠r
  • ∠i and ∠e
  • ∠i, ∠e and ∠D
  • ∠i, ∠r and ∠e

  • 9. 
    The splitting of white light into its component colours is called

  • refraction
  • reflation
  • dispersion
  • tyndall effect

  • 10. 
    Reason behind advance sunrise and delayed sunset

  • atmospheric refraction
  • total internal reflection
  • dispersion
  • reflection
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