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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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Below a typical questions that will be covered in this test. You final score will be logged on your account

Which property of uranium-235 makes it suitable as a nuclear fuel for fission reactors?
Which isotope is commonly used as fuel in many fission reactors?
If a sample has an activity that halves every 5 years, what fraction of the original activity remains after 15 years?
Which of the following best describes nuclear fission?
What is a chain reaction in the context of nuclear fission?
Which type of radiation from nuclear fission is most penetrating and requires dense shielding?
Which particle commonly initiates a fission reaction in uranium-235?
Which of these is a disadvantage commonly associated with nuclear power?
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?
Which gas is often used as a coolant or moderator in some reactors because it does not slow neutrons much and remains chemically inert?