alleryIn a nuclear reactor, which component slows down fast neutrons to sustain the controlled chain reaction?
AModerator
BControl rod
CCoolant
DProtection wall
Answer & Solution
Correct answer: A. Moderator
1. Fast neutrons must be slowed to cause further fission efficiently.
2. The moderator (graphite or heavy water) slows them down.
3. Control rods absorb neutrons to regulate the rate, they do not slow neutrons.
4. The coolant removes heat, and the wall shields radiation.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 6 Nuclear Physics "Nuclear Physics", p.91_
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