AnswersAZ-Environmental Science B SC312Nuclear Energy

Nuclear Energy — Test Answers

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1
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What happens when the amount of fissionable material exceeds the critical mass?

A
The chain reaction accelerates as more neutrons are generated with each round of reaction.
B
The chain reaction is not sustained and eventually stops.
C
The density of the reacting particles decreases, slowing the reaction.
D
The amount of material needed to establish a new critical mass increases.
2
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Which procedure will most increase the energy output of a nuclear reactor?

A
exposing the core to the outside world
B
removing fissile material from the core
C
decreasing the amount of steam produced
D
raising the control rods out of the reactor
3

What effect does supercritical mass have on a nuclear reaction?

A
The reaction rate increases.
B
The reaction produces less energy.
C
The reaction involves increased fusion.
D
The reaction produces fewer neutrons.
4

Which issue poses the greatest long-term challenge in the development of new nuclear power plants?

A
controlling carbon dioxide emissions
B
storage of radioactive waste
C
controlling fission reactions
D
mining of uranium

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