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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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Why must spent nuclear fuel be stored in special facilities for long periods?
Which material is commonly used as a moderator in many nuclear reactors to slow down neutrons?
What kind of radiation is stopped by a sheet of paper but can be very harmful if ingested?
What is meant by ‘critical mass’ in a fissionable material?
Why do nuclear reactors use shielding of thick concrete and steel around the core?
When a uranium-235 nucleus absorbs a neutron and undergoes fission, what is produced immediately besides the two smaller nuclei?
In a controlled nuclear reactor, what does “subcritical” mean?
During a controlled fission chain reaction in a reactor the term “critical” means:
Which isotope is commonly used as fuel in many fission reactors?
What is the main environmental advantage of electricity from nuclear fission compared with fossil-fuel power stations?
Which type of radiation from nuclear fission is most penetrating and requires dense shielding?