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Q.

Which of the following is a non-luminous body?


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a

The Sun

b

A star 

c

A planet

d

All of these 

answer is C.

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Detailed Solution

Concept: An item that generates light is referred to as luminous. Consequently, a non-luminous body is one that is incapable of producing or emitting light on its own. Choose the bodies that can and cannot create light on their own from the alternatives provided.
An autonomously emitting source of light is referred to as a luminous object. Additionally, a non-luminous item is one that is unable to generate its own light.
The Sun is the primary source of light on Earth, as can be seen by looking at us every day. The star at the heart of our solar system is the sun. Nuclear fusion that occurs continuously on the surface of the Sun causes it to radiate light continuously.
Since the sun is a star, it follows that all stars are bright since they all emit light. Let's think about whether a planet is a bright or non-luminous object now. Observe your surroundings once again. Planet Earth is one. Its own light is emitting. That's a no to the question. No planet, including Earth, can produce light on its own.
Hence, the correct option is 3.
 
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