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#### Light - One Mark Questions

8th Standard EM

Reg.No. :
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Science

Time : 00:30:00 Hrs
Total Marks : 20
10 x 1 = 10
1. Mirrors having a curved reflecting surface are called as

(a)

plane mirrors

(b)

spherical mirrors

(c)

simple mirrors

(d)

None of the above

2. The distance from the pole to the focus is called

(a)

Pole length

(b)

focal length

(c)

principal axis

(d)

None of the above

3. Focal length is equal to half of the

(a)

centre of curvature

(b)

axis

(c)

(d)

None of the above

4. If the focal length of a spherical mirror is 10 cm, what is the value of its radius of curvature?

(a)

10 cm

(b)

5 cm

(c)

20 cm

(d)

15 cm

5. The refractive index of water is

(a)

1.0

(b)

1.33

(c)

1.44

(d)

1.52

6. __________ form the perfect image of an object

(a)

Spherical mirrors

(b)

Parabolic mirrors

(c)

Plane mirrors

(d)

Cylindrical mirrors

7. Mirrors which magnify the object placed close to them.

(a)

Convex mirror

(b)

Concave mirror

(c)

Plane mirror

(d)

ellipsoid mirror

8. In which mirror the following statement is labeled?

(a)

Convex mirror

(b)

Concave mirror

(c)

Plane mirror

(d)

Spherical mirror

9. An imaginary line perpendicular to the reflecting surface is called

(a)

imaginary line

(b)

curved line

(c)

Perpendicular line

(d)

normal

10. When the angle of inclination decreases the number of images formed _________

(a)

increase

(b)

decreases

(c)

remain same

(d)

none of the above

11. 5 x 1 = 5
12. The spherical mirror used in a beauty parlour as make-up mirror is ___________.

()

Concave mirror

13. Geometric centre of the spherical mirror is ________.

()

Pole

14. Nature of the images formed by a convex mirror is _________.

()

Virtual and erect

15. _________ is a device which produces numerous pattern of images

()

Kaleidoscope

16. __________ is the best reflector of light

()

Silver

17. 5 x 1 = 5
18. Convex mirror

19. (1)

20. Parobolic mirror

21. (2)

plane mirror

22. Regular reflection

23. (3)

Bouncing of light

24. Reflection

25. (4)

rear - view mirror

26. Refraction

27. (5)

Bending of light