Q.

Which one among the following is-used as a moderator in nuclear reactors?

A. Ozone
B. Heavy hydrogen
C. Heavy water
D. Hydrogen peroxide
Answer» C. Heavy water
Explanation: Heavy water is used in certain types of nuclear reactors, where it acts as a neutron moderator to slow down neutrons so that they are more likely to react with the fissile uranium-235 than with uranium238.
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