Choose the correct statement s 1 A nuclear unit becomes critical means chain reaction...........

Science Affairs Nuclear related Issues

Choose the correct statement(s)

1. A nuclear unit becomes critical means chain reaction that causes automatic splitting of the fuel nuclei has been established.

2. A nuclear unit becomes critical means it is generating power at rated capacity.

3. Moderator in nuclear plants is used to reduce temperature.

4. Moderator in nuclear plants is used to reduce speed of neutrons

5. Reflector in nuclear plants is used to return neutrons to the core.

Which of the statement(s) given above is/are correct?

1 and 3

2, 4 and 5

2 and 3

1, 3 and 5

1st and 2nd statements are contradictory to each other. If 1st is correct, 2nd must be incorrect.

In the same way, 3rd and 4th are contradictory. If 3rd is correct, 4th statement must be incorrect.

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