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O-LevelPhysicsNuclear Physics5054/11 · Oct/Nov 2025 · Q401 Mark

What is a protostar?

Acloud of gas that is collapsing and decreasing in temperature
Bcloud of gas that is collapsing and increasing in temperature
Cstar that is expanding and decreasing in temperature
Dstar that is expanding and increasing in temperature

✓ Correct answer

B: cloud of gas that is collapsing and increasing in temperature

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About this question

Topic
Nuclear Physics, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source
O-Level Physics, Oct/Nov 2025 Paper 1 Variant 1, question 40.

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