A-LevelPhysicsForces, density and pressureOct/Nov 2025Paper 1 Q161 Mark
On Earth, a solid object that is fully submerged in a liquid experiences an upthrust U_E. On Mars, the same object, fully submerged in the same liquid, experiences an upthrust U_M. The acceleration of free fall on Mars is 3.7 ms⁻². Assume that the liquid's density and the object's volume have the same values on Earth and Mars. What is the ratio U_M / U_E?
A0.38
B1.0
C2.7
D3.6
✓ Correct Answer
The correct answer is A: 0.38
📋 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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