Light Test

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Light Test - 11

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Weekly Quiz Competition

Question 1
1 / -0

What happens to the light as we move away from its source such as candle?

A
It gets dimmer.

B
It gets brighter.

C
It remains the same.

D
None of these.
Question 2
1 / -0

Things that do not allow light to pass through them are said to be

A
translucent

B
opaque

C
transparent

D
luminous
Question 3
1 / -0

Light can bend around small objects. What is this property of light called?

A
Refraction

B
Diffraction

C
Dispersion

D
Reflection
Question 4
1 / -0

Centre of curvature of a spherical mirror is the

A
point which divides the mirror in two halves

B
centre of the sphere of which the mirror forms a part

C
point at which all rays converge or seem to diverge

D
central point of a spherical mirror
Question 5
1 / -0

The rear-view mirror used in a car is

A
convex

B
plane

C
concave

D
None of these
Question 6
1 / -0

A 5 feet tall man wishes to see his full image in a plane mirror. The minimum height of the plane mirror needed for this purpose is

A
5 ft

B
10 ft

C
2.5 ft

D
7.5 ft
Question 7
1 / -0

What is the focal length of a plane mirror?

A
Zero

B
Unity

C
Infinity

D
None of these
Question 8
1 / -0

How many images of an object are formed, if it is placed between two plane mirrors inclined at an angle of 60º?

A
2

B
3

C
7

D
5

Solution

Correct Answer: 5
Question 9
1 / -0

What is the nature of image formed by a plane mirror?

A
Erect and diminished

B
Erect and of the same size

C
Inverted and of the same size

D
Erect and enlarged
Question 10
1 / -0

If the velocity of light in two different media of refractive indices n₁ and n₂, is v₁ and v₂ respectively, which of the following relations will be true?

A
n₂ n₁ = v₁ v₂

B
n₂ =

C
n₂ = n₁

D
none of these
Question 11
1 / -0

In refraction of light through a prism, the light ray

A
suffers refraction only at one face of the prism

B
emerges out from the prism in a direction parallel to the incident ray

C
bends at both the surfaces of the prism opposite to its base

D
bends at both the surfaces of the prism towards its base

Solution

In refraction of light through a prism, the light ray bends at both the surfaces of the prism towards its base.
Question 12
1 / -0

What should be the angle of incidence for a ray of light, which suffers a minimum deviation of 36° through an equilateral prism?

A
36°

B
48°

C
24°

D
96°
Question 13
1 / -0

A ray of light falls normally on a glass slab. What is the angle of refraction?

A
90°

B
45°

C
30°

D
0°
Question 14
1 / -0

For a point source of light, which of the following can produce a parallel beam of light?

A
Concave lens

B
Convex mirror

C
Concave mirror

D
Two plane mirrors
Question 15
1 / -0

The image formed by convex lens is virtual when the object is placed

A
at focus

B
at infinity

C
between f and 2f

D
between the pole and its focus
Question 16
1 / -0

A ray of light, after refraction through a lens, emerges parallel to the principal axis of the lens. The incident ray either passes through or appears to meet at the

A
optical centre

B
centre of curvature of the first surface

C
first focus

D
second focus
Question 17
1 / -0

Which of the following statements is incorrect?

A
A ray of light passing through the optical centre travels without any deviation.

B
The nature of image formed by a convex lens does not depend upon the distance of the object from the lens.

C
A parallel beam of light passing through a concave lens diverges.

D
Power of lens is the reciprocal of its focal length.
Question 18
1 / -0

What is the cause of dispersion?

A
It occurs due to change in wavelength with speed of light.

B
It occurs due to change in speed of light with wavelength.

C
It is because the speed remains the same with change in wavelength.

D
None of these
Question 19
1 / -0

A dark muscular assembly which controls the size of the opening that regulates the amount of light entering the eye is called

A
pupil

B
retina

C
iris

D
cornea
Question 20
1 / -0

In the figure shown below, which of the following rays represents the correct path of light while emerging out through a glass block?

A
A

B
B

C
C

D
D

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Re-Attempt Weekly Quiz Competition

Light Test - 11

Result

Light Test - 11

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Rank

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SHARING IS CARING

Question 1

It gets dimmer.

It gets brighter.

It remains the same.

None of these.

Question 2

translucent

opaque

transparent

luminous

Question 3

Refraction

Diffraction

Dispersion

Reflection

Question 4

point which divides the mirror in two halves

centre of the sphere of which the mirror forms a part

point at which all rays converge or seem to diverge

central point of a spherical mirror

Question 5

convex

plane

concave

None of these

Question 6

5 ft

10 ft

2.5 ft

7.5 ft

Question 7

Zero

Unity

Infinity

None of these

Question 8

2

3

7

5

Solution

Question 9

Erect and diminished

Erect and of the same size

Inverted and of the same size

Erect and enlarged

Question 10

n2 n1 = v1 v2

n2 =

n2 = n1

none of these

Question 11

suffers refraction only at one face of the prism

emerges out from the prism in a direction parallel to the incident ray

bends at both the surfaces of the prism opposite to its base

bends at both the surfaces of the prism towards its base

Solution

Question 12

36°

48°

24°

96°

Question 13

90°

45°

30°

0°

Question 14

Concave lens

Convex mirror

Concave mirror

Two plane mirrors

n₂ n₁ = v₁ v₂

n₂ =

n₂ = n₁