CBSE Class 10 Science Human Eye and Colourful World Quiz 2

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

A the presence of algae and other plants found in water B reflection of sky in water C scattering of light D absorption of light by the sea

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

A crystalline lens B outer surface of the cornea C iris D pupil

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

A are relaxed and lens becomes thinner B contract and lens becomes thicker C are relaxed and lens becomes thicker D contract and lens becomes thinner

4. Which of the following statement is correct?

A A person with myopia can see distant objects clearly. B A person with hypermetropia can see nearby objects clearly. C A person with myopia can see nearby objects clearly. D 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

A is always parallel to the incident ray. B is always perpendicular to the incident ray. C is always parallel to the refracted ray. D 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:

A towards the normal while entering into the prism and away from the normal while emerging out of the prism B away from the normal while entering into the prism and towards the normal while emerging out of the prism. C away from the normal while entering as well as while emerging out of the prism. D 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:

A X, R and T B Y, Q and T C X, Q and P D 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:

A ∠i and ∠r B ∠i and ∠e C ∠i, ∠e and ∠D D ∠i, ∠r and ∠e

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

A refraction B reflation C dispersion D tyndall effect

10. Reason behind advance sunrise and delayed sunset

A atmospheric refraction B total internal reflection C dispersion D reflection