Light Energy Test

Result

Light Energy Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

True fact about observation of light is-

A
When we switch on the torch we can observe the beam of light

B
Sun light can be observed in early morning when sun rises

C
We can observed beam of light of sun through a hole

D
All of the above

Solution

According to the question the correct option will be ‘D’ because all the three statements are true that light is observed when switching on the torch, sunlight is observed in early morning and a beam of light can be observed through a hole.
Question 2
1 / -0

All of these are the sources of light except the-

A
Candle

B
Black body

C
Sun

D
Bulb

Solution

According to the question the correct option will be ‘B’ because candle, sun and bulb emit light radiation when they glow, so they are the sources of light. But black body do not emit light and thus is is not a source of light.
Question 3
1 / -0

We have to see an object in a dark room. Then:

A
we have to light a torch on our eyes

B
we have to light a torch on the object

C
both can be done

D
we can't see the object through any of the above processes

Solution

We see an object because of reflection. Light gets reflected from the object and reach our eyes and thus we can see the object. So, we have to light a torch on the object, not on our eyes.
Question 4
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A beam of light which is moving in a exact direction is-

A
wave

B
compression

C
ray

D
rarefaction

Solution

According to the question the correct option will be ‘C’ because A light ray is a narrow beam of light that is moving in a defined direction. Alternatively, a beam of light consists of lot of light rays parallel to each other.
Question 5
1 / -0

Moon does not emit light yet it is visible. Mark the most suitable statement-

A
At night the moon starts emitting light because the moon is covered by sun at night

B
Moon is visible due to the light falling on it

C
Both are true

D
None is true

Solution

Moon is a non luminous body. It is visible due to the light falling on it. It reflects the light.
Question 6
1 / -0

A yellow coloured dress would appear to be _______ when viewed through a green filter.

A
black

B
green

C
yellow

D
orange

Solution

A yellow colour dress would reflect only yellow colour and a green filter will allow only green colour to pass. So, no colour will pass through the filter and hence the dress will appear black.
Question 7
1 / -0

A beam of light is made up of:

A
Rays

B
Droplets

C
Clusters

D
Groups

Solution

A beam of light is group of rays of light travelling in a particular direction.

A ray of light is the direction along which the light energy propagates.

Hence, the correct answer is option A.
Question 8
1 / -0

Narrow stream of light is known as-

A
Ray

B
Beam

C
Sunlight

D
None of these

Solution

According to the question the correct option will be ‘A’ because Ray light is defined as each of the lines in which light (and heat) may seem to stream from the sun or any luminous body, or pass through a small opening.
Question 9
1 / -0

Diamond is :

A
transparent

B
translucent

C
opaque

D
semi-absorbent

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, a diamond allows the light to pass through it completely without any absorption or obstruction of light, it is a transparent object.
Question 10
1 / -0

A light is termed as divergent when-

A
all the rays travel parallel to each other

B
all the rays spread from a point source of light

C
all the rays converge together to a single point

D
it travels in an irregular pattern

Solution

According to the question the correct option will be ‘B’ because when the rays of light starting from a point travel in different directions, then the collection of such rays is termed as a divergent beam of light.

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Re-Attempt Weekly Quiz Competition

Light Energy Test - 3

Result

Light Energy Test - 3

Score

-

Rank

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SHARING IS CARING

Question 1

When we switch on the torch we can observe the beam of light

Sun light can be observed in early morning when sun rises

We can observed beam of light of sun through a hole

All of the above

Solution

Question 2

Candle

Black body

Sun

Bulb

Solution

Question 3

we have to light a torch on our eyes

we have to light a torch on the object

both can be done

we can't see the object through any of the above processes

Solution

Question 4

wave

compression

ray

rarefaction

Solution

Question 5

At night the moon starts emitting light because the moon is covered by sun at night

Moon is visible due to the light falling on it

Both are true

None is true

Solution

Question 6

black

green

yellow

orange

Solution

Question 7

Rays

Droplets

Clusters

Groups

Solution

Question 8

Ray

Beam

Sunlight

None of these

Solution

Question 9

transparent

translucent

opaque

semi-absorbent

Solution

Question 10

all the rays travel parallel to each other

all the rays spread from a point source of light

all the rays converge together to a single point

it travels in an irregular pattern

Solution

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