Which of the following is used as a moderator in nuclear reaction? (a) cadmium (b) plutonium (c) uranium (d) heavy water.

Answer: (d). A moderator slows fast neutrons by elastic collisions without absorbing them. Heavy water ( D₂O) has light nuclei and very low neutron absorption; cadmium is a control rod (absorber), U and Pu are fuels. So the answer is (d) heavy water.

Which of the following is used as a moderator in nuclear reaction? | NEET 1997 (AIPMT)

Q41NEET 1997 · AIPMTEasy

Nuclear Fission & Fusion

Which of the following is used as a moderator in nuclear reaction?

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Answer: (d)

A moderator slows fast neutrons by elastic collisions without absorbing them.
Heavy water ( $\text{D}_2\text{O}$ ) has light nuclei and very low neutron absorption; cadmium is a control rod (absorber), U and Pu are fuels.
So the answer is (d) heavy water.

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