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The Life Cycle Of A Star (physics Only) (GCSE Physics)

The following is a GCSE Physics test covering 'The Life Cycle Of A Star (physics Only)' from the broader topic Space Physics. The test is geared towards the AQA exam board style syllabus.
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Which physical balance determines whether a star remains stable during its main-sequence lifetime?
Which of the following best describes a planetary nebula?
What primarily causes a protostar to heat up during its formation?
During the red-giant phase, helium fusion begins in the core through which primary reaction chain?
What is the Chandrasekhar limit in the context of stellar remnants?
A protostar becomes a main-sequence star when which of the following conditions is reached?
During the red giant phase a star’s outer layers expand and the surface temperature drops. What effect does this have on the star’s observed colour?
What observational evidence can indicate that a star has recently undergone a supernova?
Which statement about white dwarfs is correct?
Which nuclear process mainly provides energy in a typical main-sequence star like the Sun?
What observational feature in a star’s spectrum indicates that hydrogen is present in its outer layers during its life?