Identify the correct statement among the following in the context of a nuclear reactor.

Moderator is used to slow down the neutrons.

The correct answer is Option (2) → Moderator is used to slow down the neutrons.

Analysis:

• Coolant is not used to slow down neutrons; it is used to carry heat away.

• ✔ Moderator is used to slow down the neutrons (e.g., heavy water, graphite).

• Cadmium rods do not slow down neutrons; they absorb neutrons (control rods).

• The energy released in nuclear reactors is of the order of MeV, not keV.

Correct Statement: Moderator is used to slow down the neutrons.