Q. What is used as a moderator in a nuclear reactor?
A) Water
B) Graphite
C) Cadmium
D) Steel
Explanation
(b) Moderator is used to slow down neutrons. Heavy water, graphite or beryllium oxide are used for this purpose. Heavy water is the best moderator.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.