A) moderator is used to slow down the neutrons
B) cadmium rods are used to slow down the neutrons
C) coolant is used to slow down the neutrons
D) moderator is used to control the neutrons
Correct Answer: A
Solution :
In a nuclear reactor moderator is used to slow down neutrons without absorbing or reacting with them. \[{{D}_{2}}O\] (deuterium oxide?heavy water), \[{{H}_{2}}O\]and graphite are common moderators.
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