a nuclear reactor is said to have become critical when | Examsbook

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Q: A nuclear reactor is said to have become 'critical' when

1
it stops due to malfunctioning
2
it starts emitting dangerous radioactive radiations
3
it is shut down to avoid explosion
4
it is ready to produce controlled energy

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Answer : 4. "it is ready to produce controlled energy"
Explanation :
Answer: D) it is ready to produce controlled energy Explanation: To produce controlled energy i.e energy at a controlled or steady rate, the number of fissions per second must be controlled and maintained at that rate. Excess neutrons should be absorbed by control roads like cadmium.

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