In a nuclear reactor, the function of a moderator is to
A. Remove heat
B. Control chain reaction
C. Absorb neutrons
D. Slow down neutrons
Answer: Option D
Solution (By JKSSB Mock Tests)
Moderator slows fast neutrons to thermal energies to increase probability of fission. Common moderators: heavy water, graphite. Control rods (cadmium, boron) absorb neutrons. Coolant removes heat.
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