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Nuclear Fission (physics Only) (GCSE Physics)

The following is a GCSE Physics test covering 'Nuclear Fission (physics Only)' from the broader topic Atomic Structure. The test is geared towards the AQA exam board style syllabus.
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During a controlled fission chain reaction in a reactor the term “critical” means:
Which of the following best explains why control rods are inserted further into the reactor core to slow the reaction?
What is the meaning of the half-life of a radioactive isotope?
Which device converts heat from fission into electrical energy in a conventional nuclear power station?
Which statement about radioactive waste from fission reactors is correct?
Why are breeder reactors designed to produce plutonium from uranium-238?
Which property of uranium-235 makes it suitable as a nuclear fuel for fission reactors?
Which particle commonly initiates a fission reaction in uranium-235?
What kind of radiation is stopped by a sheet of paper but can be very harmful if ingested?
In a controlled nuclear reactor, what does “subcritical” mean?
Which of the following best describes nuclear fission?