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Question

In a nuclear reactor, the moderator used is

A
uranium - 234
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B
uranium-238
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C
cadmium
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D
heavy water
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Solution

The correct option is D heavy water
A moderator in a nuclear reactor is used to slow down the neutrons.
Heavy water is considered as best moderator because it does not absorb a lot of neutrons and also slows down neutrons efficiently.

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