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

8th Standard

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Science

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

Part A

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 centre of a sphere of which the reflecting surface of a spherical mirror is a part is called

(a)

pole

(b)

centre of curvature

(c)

(d)

aperture

3. The imaginary line passing through the centre of curvature and pole of a spherical mirror is called

(a)

centre of curvature

(b)

pole

(c)

principal axis

(d)

4. Focal length is equal to half of the

(a)

centre of curvature

(b)

axis

(c)

(d)

None of the above

5. If the image and object distance is same, then the object is placed at

(a)

infinity

(b)

at F

(c)

between f and P

(d)

at C

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