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Q.

A substance used as a moderator in a nuclear reactor is


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a

Cadmium

b

Uranium-235

c

Lead

d

Heavy water   

answer is D.

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Detailed Solution

A substance used as a moderator in a nuclear reactor is Heavy water
In a nuclear reactor, the moderator is a material that slows down neutrons. The moderator in conventional nuclear reactors is heavy water, which also serves as the coolant (D2O). In D2O, the hydrogen atoms are slowed down by fast neutrons.
 
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A substance used as a moderator in a nuclear reactor is