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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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Which of the following is a correct safety procedure for working near radioactive sources?
What is the main purpose of control rods in a fission reactor?
What is meant by ‘critical mass’ in a fissionable material?
Which property of uranium-235 makes it suitable as a nuclear fuel for fission reactors?
Which of the following best explains why control rods are inserted further into the reactor core to slow the reaction?
Which particle commonly initiates a fission reaction in uranium-235?
Which material is commonly used as a moderator in many nuclear reactors to slow down neutrons?
Which gas is often used as a coolant or moderator in some reactors because it does not slow neutrons much and remains chemically inert?
Which statement about radioactive waste from fission reactors is correct?
Which of the following best describes nuclear fission?
Which radiation type is most harmful to living tissue if contamination occurs internally (ingested or inhaled)?