Previous year MCQs

General science UPPSC 2016 GS-I
Question

The substance used as moderator and coolant both, in nuclear reactors is:

Answer & Solution

Answer: (Detailed Solution Below)

Option B: Heavy water

Detailed Solution:

The correct answer is “Heavy water”.
The substance used as both a moderator and a coolant in some types of nuclear reactors is heavy water.

Heavy water slows down the neutrons more effectively than light water, making it an efficient moderator. Additionally, heavy water can also act as a coolant by transferring heat away from the reactor core.

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