Light Test

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Light Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

A fly is sitting on the objective of a telescope pointed towards the moon. What effect is expected in photograph of the moon taken through the telescope?

A
The entire field of vision is blocked.

B
There is an image of the fly on the photograph.

C
There is no effect at all.

D
There is a reduction in the intensity of the image.

Solution

There is a reduction in the intensity of the image.
Question 2
1 / -0

The deviation produced by a prism is

A
same for all wavelengths

B
greatest for red and least for violet

C
greatest for violet and least for red

D
not possible

Solution

The deviation produced by a prism is greatest for violet and least for red.
Question 3
1 / -0

A beam of white light after passing through a prism produces a spectrum with seven colours. This is because

A
the prism converts white light into the light of seven colours

B
the prism disperses white light into constituent components

C
the colours are produced by the screen

D
there is no colour but an optical illusion

Solution

A beam of white light after passing through a prism produces a spectrum with seven colours. This is because the prism disperses white light into constituent components.
Question 4
1 / -0

When sunlight enters the earth's atmosphere, the rays which get scattered the most are

A
violet and red

B
yellow and green

C
red and orange

D
violet and blue

Solution

When sunlight enters the earth's atmosphere, the rays which get scattered the most are violet and blue.
Question 5
1 / -0

Water is transparent to visible light while water drops in air are opaque, because

A
fine drops of water are opaque in visible light

B
most of the light is scattered and hence, apparent opacity

C
fog affects our vision adversely

D
the light rays suffer total internal reflection and cannot reach the eye of the observer

Solution

Water is transparent to visible light while water drops in air are opaque, because most of the light is scattered and hence, apparent opacity.
Question 6
1 / -0

The twinkling of stars is due to

A
the fact that stars do no emit light continuously

B
frequent absorption of starlight by their own atmosphere

C
the fact that refractive index of the earth's atmosphere fluctuates

D
intermittent absorption of starlight by earth's atmosphere

Solution

The twinkling of stars is due to the fact that refractive index of the earth's atmosphere fluctuates.
Question 7
1 / -0

If a person uses spectacles with concave lenses, he is suffering from

A
myopia

B
hypermetropia

C
astigmatism

D
cataract

Solution

If a person uses spectacles with concave lenses, he is suffering from myopia.
Question 8
1 / -0

Cylindrical lenses are used to correct the defect of

A
myopia

B
hypermetropic

C
presbyopia

D
astigmatism

Solution

Astigmatism is a condition that causes blurred vision. It occurs when the cornea is irregularly shaped, or sometimes because of the curvature of the lens inside the eye. Cylindrical lenses are used to correct the defect of astigmatism.

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Re-Attempt Weekly Quiz Competition

Light Test - 4

Result

Light Test - 4

Score

-

Rank

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SHARING IS CARING

Question 1

The entire field of vision is blocked.

There is an image of the fly on the photograph.

There is no effect at all.

There is a reduction in the intensity of the image.

Solution

Question 2

same for all wavelengths

greatest for red and least for violet

greatest for violet and least for red

not possible

Solution

Question 3

the prism converts white light into the light of seven colours

the prism disperses white light into constituent components

the colours are produced by the screen

there is no colour but an optical illusion

Solution

Question 4

violet and red

yellow and green

red and orange

violet and blue

Solution

Question 5

fine drops of water are opaque in visible light

most of the light is scattered and hence, apparent opacity

fog affects our vision adversely

the light rays suffer total internal reflection and cannot reach the eye of the observer

Solution

Question 6

the fact that stars do no emit light continuously

frequent absorption of starlight by their own atmosphere

the fact that refractive index of the earth's atmosphere fluctuates

intermittent absorption of starlight by earth's atmosphere

Solution

Question 7

myopia

hypermetropia

astigmatism

cataract

Solution

Question 8

myopia

hypermetropic

presbyopia

astigmatism

Solution

User

Question Analysis

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