Which of the following describes the primary energy-producing process in the core of a stable main-sequence star?
The nuclear fission of helium nuclei into hydrogen nuclei.
The nuclear fusion of hydrogen nuclei to form helium nuclei.
The nuclear fission of heavy elements like uranium into lighter metallic nuclei.
The nuclear fusion of helium nuclei to form carbon nuclei.
25 exam-style questions on CIE IGCSE Physics 6.2.2a Galaxies and astronomical distances. Each one has a worked solution and a mark scheme showing where the marks go.