#### Light English Medium Free Online Test 1 Mark Questions with Answer Key 2020 - 2021

8th Standard

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Science

Time : 00:10:00 Hrs
Total Marks : 10

Part A

10 x 1 = 10
1. The spherical mirror with a reflecting surface curved inward is called

(a)

convex mirror

(b)

concave mirror

(c)

curved mirror

(d)

None of the above

2. The spherical mirror used as a rear view mirror in the vehicle is

(a)

concave mirror

(b)

convex mirror

(c)

plane mirror

(d)

None of the above

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

(a)

Pole length

(b)

focal length

(c)

principal axis

(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