Light Test

Result

Light Test - 1

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Question 1
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Objects that allow the light to pass through them partially are known as

A
Opaque objects

B
Luminous objects

C
Transparent objects

D
Translucent objects

Solution

A translucent object allows a partial passage of light through it. Hence, there is partial visibility through a translucent object.
Question 2
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One cannot see beyond the door of a closed room because it is

A
transparent

B
translucent

C
refracting

D
opaque

Solution

This question is successfully answered by the student who can classify the optical properties of different objects. If one cannot see through an object at all, then it is classified as being opaque. Hence, one cannot see beyond the door of a closed room because it is an opaque object.

The correct answer is D.

Why alternative A is wrong:

If one can clearly see through an object, then it is classified as being transparent. A door is not a transparent object as it does not allow light to pass through it. Hence, this alternative is incorrect.

Why alternative B is wrong:

Translucent objects allow light to pass through them partially. A door does not allow any light to pass through it. Therefore, it is not a translucent object. Hence, this alternative is incorrect.

Why alternative C is wrong:

The door does not transmit light through it. Therefore, it cannot refract light. Hence, this alternative is incorrect.
Question 3
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A clear shadow is obtained on a screen because it is formed by

A
an opaque object

B
a transparent object

C
the reflection of light

D
the refraction of light

Solution

To answer this question correctly, the student needs to examine the formation of shadows. A clear shadow can be formed only by opaque objects. This is because they do not allow any light to pass through them. Hence, a clear shadow is obtained on a screen because it is formed by an opaque object.

The correct answer is A.

Why alternative B is wrong:

A transparent object can transmit light rays through it. As a result, it cannot form any shadow. Hence, this alternative is incorrect.

Why alternative C is wrong:

Shadows are formed when light rays are blocked by an opaque object. Reflection of light does not play any role in the formation of shadows. Hence, this alternative is incorrect.

Why alternative D is wrong:

Shadows are formed when light rays are blocked by an opaque object. Refraction of light does not play any role in the formation of shadows. Hence, this alternative is incorrect.
Question 4
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Which of the following statement is false about luminous object?

A
Some objects or materials are not a source of light.

B
A candle has its own source of light.

C
Bulb and lamp are artificial luminous objects.

D
Stars emit light on their own.

Solution

A candle is an artificial luminous object.
Question 5
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Which of the following objects are non-luminous in nature?

A
Sun

B
Star

C
Glowworm

D
Charcoal

Solution

Charcoal is a non-luminous object.