Heavy water is used in atomic reactor as-

Moderator

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Coolant

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Both moderator and coolant

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Neither coolant and moderator

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Solution

The correct option is C
Both moderator and coolant

Heavy water is used to slow down the speed of fast moving neutrons as moderator and also as a coolant

Suggest Corrections

List I (Nuclear reactor components)	List II (Substance used)
A. Moderator	$1.$ Sodium
B. Control rods	$2.$ Uranium
C. Fuel rods	$3.$ Graphite
D. Coolant	$4.$ Boron

List-I Nuclear reactor component	List-II Substance used
$(A)$ Moderator	$(i)$ Uranium
$(B)$ Control rods	$(i i)$ Graphite
$(C)$ Fuel rods	$(i i i)$ Boron
$(D)$ Coolant	$(i v)$ Lead
	$(v)$ Sodium