Q.

The substance used as 'Moderator' in atomic reactors is

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a

Boron

b

Cadmium

c

Uranium - 235

d

Heavy water

answer is D.

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Detailed Solution

D2O reduces the speed on neutrons so used as moderator. If it is not used then the neutrons will accelerate and leads to fast reactions, leading to the liberation of high amounts of heat at a given time. In short explosion will occur.
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The substance used as 'Moderator' in atomic reactors is