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Nuclear Fusion (physics Only) (GCSE Physics)

The following is a GCSE Physics test covering 'Nuclear Fusion (physics Only)' from the broader topic Atomic Structure. The test is geared towards the AQA exam board style syllabus.
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Why are strong magnetic fields used in tokamak fusion devices?
Why are helium nuclei (alpha particles) useful inside a fusion plasma such as an operating D–T plasma?
What happens to the binding energy per nucleon as light nuclei fuse into heavier nuclei up to iron (Fe)?
Which property of the nuclei must be overcome for fusion to occur, and how is it overcome?
Which description best defines the “Coulomb barrier” in fusion?
Which energy source powers most stars, including the Sun, over their main life?
Which atomic-structure fact is true and important for understanding fusion fuel?
What is a realistic near-term technical aim for experimental fusion devices such as ITER?
Which particle conservation law must hold true in any fusion reaction?
In the Sun, hydrogen nuclei fuse to form helium. Which particle is NOT produced directly by the main proton–proton chain reaction?
Which of these is a correct safety or environmental concern specifically associated with fusion reactors?