Light Worksheet-6

Light Worksheet-6

1. A reflecting periscope uses :

(a) single plane mirror inclined at an angle of 45°

(b) two plane mirrors facing each other and inclined at an angle of 45°

(c) two plane mirrors facing each other and inclined at an angle of 60°

(d) None of these

2. When two plane mirrors are facing each other, such that an object is placed in between them, then the number of images formed in each mirror will be :

(a) 2                    (b) 20                 (c) 10                  (d) infinite

3. An aero plane flying high in the sky does not cast its shadow on the ground because :

(a) umbra region does not reach the earth

(b) penumbra region is too faint

(c) Umbra region does not reach and penumbra region is too faint

(d) light bends around the aero plane

4. Shadow caused by one heavenly body upon another heavenly body is called:

(a) heavenly shadow          (b) celestial shadow

(c) eclipse                                       (d) None of these

5. Which is a transparent medium?

(a) Alcohol                                     (b) Mist

(c) Tissue paper                            (d) Wood

6. A medium which partially allows the light energy to pass through it is called :

(a) translucent medium              (b) transparent medium

(c) heterogeneous medium        (d) homogeneous medium

7. The primary source of light for the earth is :

(a) stars             (b) moon            (c) sun                (d) Sun and Moon

8. Which is the weak source of light in the night sky?

(a) stars             (b) moon            (c) planets         (d) all of these

9. In lateral inversion

(a) Right side of the object will be right side of the image

(b) Left side of the object will be left side of the image

(c) Upside of the object will be down side of the object

(d) Right side of the object will be left side of the image

10. The diagram below shows a ray of light being reflected from a plane mirror. Which of the labelled angles are the angle of incidence and the angle of reflection?

(a) Angle of incidence – 1; Angle of reflection – 2

(b) Angle of incidence – 2; Angle of reflection – 3

(c) Angle of incidence – 1; Angle of reflection – 4

(d) Angle of incidence – 3; Angle of reflection – 1

Answer Key:

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