Light Worksheet-3

Light Worksheet-3

1. In a periscope, the reflecting mirrors will be:

(a) perpendicular to each other

(b) parallel to each other

(c) at an angle of 45°

(d) at an angle of 60°

2. The nature of image formed on the retina of human eye is:

(a) virtual and erect                     (b) virtual and inverted

(c) real and erect                          (d) real and inverted

3. The presistence of the eye is only for:

(a) 1/10^th of a second                   (b) 1/12^th of a second

(c) 1/16^th of a second                   (d) 1/20^th of a second

4. The outer layer of the eye is called:

(a) Cornea         (b) Sclerotic      (c) Choroid        (d) Retina

5. The part which protects the human eye is called:

(a) Cornea         (b) Chroid         (c) Retina          (d) blind spot

6. The pupil in human eye can be dilated by:

(a) Retina          (b) Choroid       (c) optic nerve  (d) iris

7. Which of the following statements about human eye is NOT true?

(a) the iris gives a distinct colour to the eye

(b) the yellow spot is extremely sensitive to light

(c) the space between lens and cornea is filled with ciliary muscles

(d) the optic nerves enters the eye near the blind spot

8. Cataract is a condition of eye when:

(a) eye sight becomes foggy       (b) eye lens becomes cloudy

(c) there is a loss of vision (d) all of these

9. Nocturnal animals like owl & bat have:

(a) large cornea

(b) large pupil

(c) retina with large number of rods

(d) all of these

10. Night blindness occurs due to deficiency of which vitamin?

(a) A                    (b) B                    (c) C                    (d) D

Answer Key:

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