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#### Light - One Mark Questions

9th Standard

Reg.No. :
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Science

Time : 00:30:00 Hrs
Total Marks : 20
10 x 1 = 10
1. The field of view * is maximum for ________

(a)

plane mirror

(b)

concave mirror

(c)

convex mirror

2. When a ray of light passes from one medium to another medium, refraction takes place when angle of incidence is

(a)

0o

(b)

45o

(c)

90o

3. _________ is used as reflectors in torchligh

(a)

concave mirror

(b)

convex mirror

(c)

plane mirror

4. The focal length of a concave mirror is 5cm. Its radius of curvature is

(a)

5 cm

(b)

10 cm

(c)

2.5 cm

5. When a beam of white light passes through a prism it gets

(a)

Reflected

(b)

deviated and dispersed

(c)

only deviated

6. Mirrors having spherical surface of reflection are __________________

(a)

plane mirror

(b)

lenses

(c)

spherical mirrors

(d)

prism

7. A spherical mirror which has reflecting curved inward surface is ____________________mirror

(a)

concave

(b)

convex

(c)

plano concave

(d)

plano convex

8. The mirror that diverge the light rays is______________________

(a)

concave

(b)

convex

(c)

plane

(d)

None of these

9. The centre of the sphere, of which a spherical mirror is a part is called ______________________

(a)

pole

(b)

radius of curvature

(c)

focus

(d)

centre of curvature

10. The centre of the reflecting surface of a spherical mirror is _____________________

(a)

centre of curvafure

(b)

focus

(c)

pole

(d)

radius of curvature

11. 5 x 1 = 5
12. In going from a rarer to denser medium, the ray of light bends _________

()

towards the normal

13. The ratio of sine of the angle of incidence to the sine of  _________ is a constant

()

Infraction

14. The mirror used in search light is ________ .

()

Concave

15. Light travels in the form of _____________________________

()

electro magnetic waves

16. The branch of optics that treats light as rays is named ray optics or_________________________

()

geometrical optics

17. 5 x 1 = 5
18. The angle of deviation depends on the refractive index of the glass

(a) True
(b) False
19. If a ray of light passes obliquely from one medium to another, it does not suffer any deviation.

(a) True
(b) False
20. If the object is at infinity in front of a convex mirror the image is formed at infinity.

(a) True
(b) False
21. Mirror equation is $\frac { 1 }{ f } =\frac { 1 }{ u } -\frac { 1 }{ v }$

(a) True
(b) False
22. In sign conversion for spherical mirrors the object is always placed on the right side of the mirror.

(a) True
(b) False