Light Worksheet-6

Light Worksheet-6

1. When an object moves closer to a concave lens, the image formed by it shifts

(a) Away from the lens

(b) First away and then towards the lens

(c) Towards the lens

(d) First towards and then away from the lens.

2. The cornea is a transparent structure which

(a) Refracts light                          (b) Reflects light

(c) Absorbs light                           (d) Focuses light

3. Nerve cells in eyes which are sensitive to bright light are

(a) Rods                                         (b) Cones

(c) Ciliary muscles                       (d) Optic nerve

4. A narrow beam of white light is passed through a glass prism.

Which of the following is the correct order of colours emerging from the prism?

(a) P-Red, Q-Blue, R-Green      (b) P-Red, Q-Green, R-Blue

(c) P-Blue, Q-Green, R-Red      (d) P-Blue, Q-Red, R-Green

5. In the diagram, the coin is just out of sight. If water is poured into the metal can, the coin will

(a) Become visible                       (b) Appear smaller

(c) Remain as such                      (d) Float to the surface

6. A periscope works on the principle that light _______.

(a) Can bend around corners    (b) Is given out by all objects

(c) Rays can be reflected            (d) Rays can be refracted

7. A rainbow is formed as a result of the

(a) Absorption of sunlight by the raindrops

(b) Reflection of sunlight by the raindrops

(c) Dispersion of sunlight by the raindrops

(d) Separation of sunlight by the raindrops

8. United Football Club are playing an evening match. The team's colours are a blue and white stripe. What colour would the stripe appear under floodlights which produce a yellow light?

(a) Black and yellow                    (b) Blue and white

(c) Blue and yellow                      (d) Black and white

9. Splitting of light into its constituent colours is known as

(a) Scattering                                (b) Absorption

(c) Dispersion                               (d) Reflection

10. Three light bulbs are concealed from an observer by an opaque wall as shown in the figure. Without shifting the positions of the observer and the bulbs, the images of which of the bulbs can the observer see from the plane mirror?

(a) P and R        (b) P and Q       (c) Only P          (d) Q and R

Answer Key:

(1)-(a); (2)-(a); (3)-(d); (4)-(b); (5)-(a); (6)-(c); (7)-(c); (8)-(a); (9)-(c); (10)-(b)