Chemistry Test Preparations On Nuclear Power Engineering Part 2

Test Preparation on Chemistry Test Preparations On Nuclear Power Engineering Part 2

1.

The velocity of thermal (slow) neutrons triggering nuclear fission reaction (having energy equal to 0.025 eV) is about __________ metres/second.

11100
22200
33300
44400

2.

Thermal shield is used in high powered nuclear reactors to

1protect the walls of the reactor from radiation damage.
2absorb the fast neutrons.
3slow down the secondary neutrons.
4protect the fuel element from coming in contact with the coolant.

3.

The half-life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half-life period of a radioactive substance is one month, then

13/4th of it will disintegrate in two months.
2it will completely disintegrate in two months.
3it will completely disintegrate in four months.
4l/8th of it will remain intact at the end of four months.

4.

Graphite is used in a nuclear reactors as

1insulation lining of the reactor.
2fuel
3lubricant
4retarder of neutron velocity.

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