Q.

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

A. Ozone
B. Heavy hydrogen
C. Hydrogen peroxide
D. Heavy water
Answer» D. Heavy water
Explanation: A pressurized heavy-water reactor (PHWR) is a nuclear reactor, commonly using natural uranium as its fuel, that uses heavy water (deuterium oxide D2O) as its coolant and neutron moderator.
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