Question 1
What is the main purpose of a moderator in a thermal nuclear reactor?
to shield the surroundings from ionising radiations
to decrease the number of fission chain reactions
to decrease neutron speeds
to prevent the core from overheating
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Question 2
In the core of a nuclear reactor, the mass of fuel decreases at a rate of 9.0 × 10−6 kg hour−1 due to nuclear reactions.
What is the maximum power output of the reactor?
2.3 × 108 W
1.4 × 1011 W
8.1 × 1011 W
2.9 × 1015 W
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Question 3
A deuterium nucleus and a tritium nucleus fuse together to form a helium nucleus and a particle X. The equation for this process is:
What is X?
electron
neutron
positron
proton
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Question 4
What effect are the control rods intended to have on the average kinetic energy and number of fission neutrons in a thermal nuclear reactor?
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Question 5
During a single fission event of uranium-235 in a nuclear reactor the total mass lost is 0.23 u. The reactor is 25% efficient.
How many events per second are required to generate 900 MW of power?
1.1 × 1014
6.6 × 1018
1.1 × 1020
4.4 × 1020
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Question 6
Which of the following substances can be used as a moderator in a nuclear reactor?
boron
concrete
uranium-238
water
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Question 7
The mass of the fuel in a fission reactor decreases at a rate of 6.0 × 10−6 kg hour−1.
What is the maximum possible power output of the reactor?
75 MW
150 MW
300 MW
9,000 MW
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Question 8
When a nucleus of uranium-238 absorbs a neutron, one combination of fission products can be tin-126 and a nucleus of element X. 13 neutrons are also emitted.
How many neutrons are there in the nucleus of element X?
30
42
58
100
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Question 9
The total energy released in a single fusion reaction is 4.0 MeV.
What is the change in mass in this fusion reaction?
7.1 × 10−36 kg
7.1 × 10−30 kg
2.1 × 10−21 kg
4.4 × 10−17 kg
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