Light Test

Result

Light Test - 10

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Weekly Quiz Competition

Question 1
1 / -0

The region where light is totally or partially cut off by an opaque body is called

A
reflection

B
shadow

C
refraction

D
None of these
Question 2
1 / -0

Which of the following statements is incorrect?

A
White light consists of seven colours.

B
A tube light is a cold source of light.

C
The moon is a cold luminous mirror.

D
Glass is a transparent medium.
Question 3
1 / -0

Light is called a

A
mechanical wave as it requires a medium for its propagation

B
mechanical wave as it does not require a medium for its propagation

C
non-mechanical wave as it requires a medium for its propagation

D
non-mechanical wave as it does not require a medium for its propagation
Question 4
1 / -0

Rajan moves towards a plane mirror with a speed of 8 m/s. Then, he sees his image to be moving towards him with a speed of

A
4 m/s

B
8 m/s

C
16 m/s

D
32 m/s
Question 5
1 / -0

In the case of a concave mirror, the image coincides with the object when the object is placed at

A
infinity

B
focus

C
centre of curvature

D
any point
Question 6
1 / -0

Which of the following is the relation between focal length (f) and radius of curvature (R)?

A
R =

B
R = 2f

C
R = f

D
None of these
Question 7
1 / -0

What is the nature of the image formed in a periscope?

A
Real with lateral inversion

B
Real without lateral inversion

C
Virtual without lateral inversion

D
Virtual with lateral inversion

Solution

A periscope consists of two plane mirrors. The image formed in one mirror behaves as the object for the second mirror, so the image gets laterally inverted twice, and the image is formed behind the mirror. So, the final image formed is virtual without lateral inversion.
Question 8
1 / -0

According to the law of reflection,

A
sin i + sin r = constant

B
= constant

C
i = r

D
= constant
Question 9
1 / -0

If the velocity of light in vacuum is 3 10⁸ m/s, find the refractive index of water.
(Take velocity of light in water = 2.26 10⁸ m/s)

A
1.33

B
0.75

C
6.78

D
None of these
Question 10
1 / -0

On which of the following factors does the deviation produced by an equilateral prism not depend?

A
Angle of incidence

B
Material of the prism

C
Size of the prism

D
Angle of refraction
Question 11
1 / -0

A ray of light incident at an angle of 45° on a prism of refracting angle 60° suffers a minimum deviation. What is the angle of minimum deviation?

A
30°

B
45°

C
60°

D
15°
Question 12
1 / -0

When a ray of light in air is incident along the normal to the boundary of air glass surface, it will

A
go undeviated in a glass

B
bend towards the normal

C
bend away from the normal

D
vanish
Question 13
1 / -0

A ray of light passes from medium 1 to medium 2. Which of the following characteristics of the refracted ray will differ from that/those of the incident ray?

A
Speed

B
Intensity

C
Frequency

D
Both (1) and (2)
Question 14
1 / -0

A virtual image larger than the object can be produced by

A
convex mirror

B
concave mirror

C
plane mirror

D
concave lens
Question 15
1 / -0

For an object placed between the optical centre and focus of a convex lens, the image is

A
real and enlarged

B
real and diminished

C
virtual and enlarged

D
virtual and diminished
Question 16
1 / -0

Which of the following figures is correct?

A

B

C

D
Question 17
1 / -0

Which of the following colours of the spectrum of white light has/have wavelength(s) longer than that of blue light?

A
Violet

B
Green

C
Red

D
Both (2) and (3)
Question 18
1 / -0

Why does the sky appear dark instead of blue to an astronaut?

A
This is because there is no atmosphere containing air in the outer space to scatter light.

B
This is because black colour is scattered the most.

C
This is because black colour is scattered the least.

D
This is because of scattering of all the seven colours of white light.
Question 19
1 / -0

A transparent spherical structure that refracts light into the eye is called

A
pupil

B
retina

C
iris

D
cornea
Question 20
1 / -0

If the velocity of light in vacuum is 3 10⁸ m/s, the velocity of light in diamond is
(Given: The refractive index of diamond is 2.417)

A
2 10⁸ m/s

B
2.1 10⁸ m/s

C
120 m/s

D
1.2 10⁸ m/s