Nuclei - Result Question 48
49. Which of the following is used as a moderator in nuclear reactors?
[1997]
(a) Plutonium
(b) Cadmium
(c) Heavy water
(d) Uranium
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Answer:
Correct Answer: 49. (c)
Solution:
- (c) Moderator used in nuclear reactor are graphite and heavy water.
Characteristics of moderator are
(i) Its atomic weight must be low
(ii) It should not absorb neutrons
(iii) It should undergo elastic collisions with neutrons and reduce their velocity.
