O-LevelPhysicsNuclear PhysicsOct/Nov 2025Paper 1 Q401 Mark

What is a protostar?

Q: What topic does this question test?

This question tests Nuclear Physics in O-Level Physics (syllabus code 5054). It is worth 1 mark.

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

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

📋 Examiner Report & Trap Analysis

Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...

🎯 Mark Scheme Breakdown

Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.

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About This O-Level Physics Question

Topic

This multiple-choice question tests Nuclear Physics in O-Level Physics (syllabus code 5054). It is worth 1 mark.

Source

This question appeared in the Cambridge O-Level Physics Oct/Nov 2025 examination, Paper 1 Variant 1.

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