Light Test

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Light Test - 42

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is correct regarding 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

Reflection is a phenomenon in which the incident rays are sent back into same medium following laws of reflection.

Answer-(A)
Question 2
1 / -0

When a student looks into a plane mirror, she sees a virtual image of herself. However, when she looks into a sheet of paper, no such image forms. Which light phenomenon occurs at the surface of the paper?

A
Regular reflection

B
Diffuse reflection

C
Polarization

D
Resonance

Solution

When a student looks into the plane mirror, regular reflection takes place and a proper image is formed. However, when the student looks into the paper, most of the light is absorbed by the paper. The light reflected is irregular/diffused in nature and is reflected in all directions. Hence, no image is formed. Hence, he/she cannot see his image in the paper.
Question 3
1 / -0

White light can be separated into its components because

A
Each ray of color is deviated by the prism by a different amount.

B
Each ray of color is deviated by the prism by the same amount.

C
Few rays of color are deviated by the prism by the same amount and others by a different amount.

D
None of these

Solution

Since each component of white light has a different wavelength, the refractive index of prism material will be different for components. Therefore, the angle of refraction for different components will be different. This will cause the splitting of components.

Hence-(A)
Question 4
1 / -0

Which of the following scientists did the pioneering work to understand the splitting of white light in different components?

A
Thomas Edison

B
Albert Einstein

C
Issac Newton

D
Archimedes

Solution

Newton was the first to understand that white light consists of a mix of light rays, each with a different color.
Question 5
1 / -0

An object is placed between two parallel mirrors, then the number of images formed are

A
0

B
2

C
$\infty$

D
4

Solution

Number of images formed will be infinite, but of decreasing intensity.
Question 6
1 / -0

Choose the correct option

A
Moon is a luminous object because it glows

B
Moon is a luminous object because it is a source of light

C
Sun is a luminous object because it is a source of light

D
Sun is not a luminous object

Solution

Objects that give out or emit light of their own are called as $\bf{luminous\ objects}$ .
Objects which do not emit light on their own are called $\bf{non-luminous}$ objects.

Sun is a luminous object because it a source of light and consequently emits light of it's own.
Moon is a non-luminous object because it does not emits it's own light and glows by reflecting the light of the sun.

Hence, the correct answer is OPTION C.
Question 7
1 / -0

Choose the correct option regarding luminous objects

A
All objects which glow are luminous objects

B
Objects which is not source of light is luminous objects

C
Objects which glow can be luminous objects

D
None of the above

Solution

Luminous objects can be defined as objects which emit their own light by use of some reactions or energy source.
For example - Sun, stars.
Question 8
1 / -0

We cannot see things in the absence of:

A
Air

B
Water

C
Light

D
Earth

Solution

We can see things when rays of light coming from any object reach our eyes. So, we cannot see in the dark because of the absence of light.
Question 9
1 / -0

Three flat mirrors are arranged mutually perpendicular to each other. The number of distinct images that will be formed due to a point object is?

A
$6$

B
$7$

C
$12$

D
None of these

Solution

7
Images formed between any 2 mirrors is: $\dfrac{360}{\theta} - 1$
Hence, 3 images between 2 mirrors, which are along the sides. These 3 images form 3 images on the top, and the original body forms one on top.
∴ Total images=3+3+1=7
Question 10
1 / -0

Periscope is built on the concept of

A
refraction of light

B
reflection of light

C
dispersion of light

D
scattering of light

Solution

Periscope is an instrument used for observation around or through an obstacle that prevents direct line-in-sight observation from the observer position.

The light from one end enters the periscope which then reflects at the first mirror and then on the second mirror before finally going out of the periscope to the observer's eyes.
So, the working principle of periscope is reflection of light through the two mirrors.

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Re-Attempt Weekly Quiz Competition

Light Test - 42

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Light Test - 42

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SHARING IS CARING

Question 1

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 2

Regular reflection

Diffuse reflection

Polarization

Resonance

Solution

Question 3

Each ray of color is deviated by the prism by a different amount.

Each ray of color is deviated by the prism by the same amount.

Few rays of color are deviated by the prism by the same amount and others by a different amount.

None of these

Solution

Question 4

Thomas Edison

Albert Einstein

Issac Newton

Archimedes

Solution

Question 5

0

2

∞\infty ∞

4

Solution

Question 6

Moon is a luminous object because it glows

Moon is a luminous object because it is a source of light

Sun is a luminous object because it is a source of light

Sun is not a luminous object

Solution

Question 7

All objects which glow are luminous objects

Objects which is not source of light is luminous objects

Objects which glow can be luminous objects

None of the above

Solution

Question 8

Air

Water

Light

Earth

Solution

Question 9

666

777

121212

None of these

Solution

Question 10

refraction of light

reflection of light

dispersion of light

scattering of light

Solution

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$\infty$

$6$

$7$

$12$