Light Energy Test

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Light Energy Test - 7

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Weekly Quiz Competition

Question 1
1 / -0

The Ray is the ray of light striking a surface is called-

A
Incident

B
refracted

C
reflected

D
All the above

Solution

According to the question the correct option will be ‘A’ because Incident ray is the ray of light striking a surface.
Question 2
1 / -0

the phenomenon has two angles that are equal to each other is called-

A
Reflection

B
Refraction

C
Diffraction

D
Constructive interference

Solution

According to the question the correct option will be ‘A’ because According to Snell's law of reflection, the angle of reflection with normal is equal to the angle of incidence with that normal and all these lie in the same plane.

Hence option A is correct.
Question 3
1 / -0

The bouncing of a beam of light from a polished surface in some other direction is called -

A
Diffraction

B
Reflection

C
Dispersion

D
Refraction

Solution

Refraction of light is the phenomenon of bending of light or change in the direction of light, when it passes obliquely from one transparent medium to another.
Reflection is the phenomenon in which light rays on striking a polished surface(such as a mirror) bounce back or are sent back into the same medium.
Dispersion is the phenomenon of splitting of white light into its component colours (VIBGYOR) on passing through a glass prism.
Scattering is the phenomenon by which a beam of light is redirected or deflected in many different directions, when it passes through an imperfect medium, due to interaction with the particles of the medium.
Hence, the correct answer is option B.
Question 4
1 / -0

The perpendicular drawn to the surface of the mirror at the point of incidence is known as:

A
reflected ray

B
refracted ray

C
incident ray

D
normal ray

Solution

According to definition, the perpendicular drawn to the surface of the mirror at the point of incidence is known as normal ray.
Question 5
1 / -0

A ray of light from air suffers partial reflection and refraction at the boundary of water as shown in the figure. In Fig, which of the ray is the correct partially reflected ray?

A
D

B
B

C
C

D
E

Solution

According to the question, the correct option will be ‘D’ because Since E is the only reflected ray and the angle of reflection is lesser than the angle of incidence it is the correct option for partially reflected ray.
Question 6
1 / -0

Which of the following phenomenon by which the incident light falling on a surface is sent back into the same medium is called as ___________.

A
Reflection

B
Refraction

C
Dispersion

D
None

Solution

According to the question the correct option will be ‘A’ because Reflection is the phenomenon by which the incident light falling on a surface is sent back into the same medium.
Question 7
1 / -0

Which of the following is not incorrect about reflection.

A
Reflection is a phenomenon by which light incident on a surface is sent back into the same medium

B
Reflection is a phenomenon by which light incident on a surface passes into another medium

C
Reflection is a phenomenon by which light incident on a surface is scattered

D
Reflection is a phenomenon by which light incident on a surface is absorbed by the surface

Solution

According to the question the correct option will be ‘A’ because Reflection is a phenomenon in which the incident rays are sent back into same medium following laws of reflection.
Question 8
1 / -0

Reflection can occur on

A
Transparent surfaces

B
Translucent surfaces

C
Opaque surfaces

D
B and C

Solution

Objects which allow the light to pass through them completely without any obstruction are called transparent objects.
Objects which allow the light to pass through them partially are called translucent objects.
Objects which do not allow the light to pass through them are called opaque objects.
Since, transparent objects allow light to pass through them completely, no reflection can occur on them.
Reflection occurs on translucent surfaces because they reflect a certain amount of light while allowing a certain amount of light to be transmitted. Reflection occurs perfectly on Opaque surfaces because they reflect all the light that falls on them without allowing any light to pass through them.
Hence, the correct answer is option D.
Question 9
1 / -0

an object, that reflects some light and transmits some light, is called -

A
Colored

B
Opaque

C
Diffuse

D
Translucent

Solution

According to the question the correct option will be ‘D’ because An object, that reflects some light and transmits some light, is called translucent.
Question 10
1 / -0

A ray of light is incident at an angle of \(35^{\circ}\) on a plane mirror. What is angle \(\theta\) ?

A
\(35^{\circ}\)

B
\(45^{\circ}\)

C
\(55^{\circ}\)

D
\(65^{\circ}\)

Solution

angle of reflection = angle of incidence
\(\Rightarrow 90^{\circ}-\) angle of reflection \(=90^{\circ}-\) angle of incidence
Question 11
1 / -0

If the angle of incidence is 80 degree, then angle of reflection with respect to the normal drawn perpendicular at the point of reflection is-

A
80^o

B
100^o

C
160^o

D
20^o

Solution

According to the question the correct option will be ‘A’ because From laws of reflection, we get angle of incidence ii is equal to the angle of reflection r.

Angle of incidence i = 80^o

Thus angle of reflection r = i = 80^o
Question 12
1 / -0

from the plane mirror distance of the image = distance of the ........

A
Second image

B
object

C
both

D
none

Solution

According to the question the correct option will be ‘A’ because In case of plane mirror, from the mirror distance of the image = distance of the object and second image both.
Question 13
1 / -0

the laws of reflection hold not false for:

A
plane mirrors only

B
concave mirrors only

C
convex mirrors only

D
all reflecting surfaces

Solution

According to the question the correct option will be ‘D’ because The laws of reflection hold true for all the reflecting surfaces either spherical or plane. Therefore, the plane mirror, concave mirror and the convex mirror all will follow the laws of reflection.

Thus, option (D) is correct.
Question 14
1 / -0

The term reflection refers to the bending of light rays:

A
when they strike a mirror

B
when they enter a different medium

C
around a sharp edge

D
around the boundary of a narrow aperture

Solution

According to the question the correct option will be ‘A’ because The term reflection refers to the bending of light rays when they strike a mirror.
Question 15
1 / -0

An ideal mirror is -

A
Absorbs all the amount of light incident on it

B
Refracts all the light

C
Reflects all the light

D
None of the above

Solution

According to the question the correct option will be ‘C’ because An ideal mirror is defined as object having a reflecting surface so smooth that it reflect back all the light rays striking without any absorbance and remittance.

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Light Energy Test - 7

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Light Energy Test - 7

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Question 1

Incident

refracted

reflected

All the above

Solution

Question 2

Reflection

Refraction

Diffraction

Constructive interference

Solution

Question 3

Diffraction

Reflection

Dispersion

Refraction

Solution

Question 4

reflected ray

refracted ray

incident ray

normal ray

Solution

Question 5

D

B

C

E

Solution

Question 6

Reflection

Refraction

Dispersion

None

Solution

Question 7

Reflection is a phenomenon by which light incident on a surface is sent back into the same medium

Reflection is a phenomenon by which light incident on a surface passes into another medium

Reflection is a phenomenon by which light incident on a surface is scattered

Reflection is a phenomenon by which light incident on a surface is absorbed by the surface

Solution

Question 8

Transparent surfaces

Translucent surfaces

Opaque surfaces

B and C

Solution

Question 9

Colored

Opaque

Diffuse

Translucent

Solution

Question 10

\(35^{\circ}\)

\(45^{\circ}\)

\(55^{\circ}\)

\(65^{\circ}\)

Solution

Question 11

80o

100o

160o

20o

Solution

Question 12

Second image

object

both

none

Solution

80^o

100^o

160^o

20^o