A-LevelPhysicsForces, density and pressureFeb/Mar 2024Paper 1 Q121 Mark
A borehole of depth 2000 m contains both oil and water, as shown. The pressure due to the liquids at the bottom of the borehole is 17.5MPa. The density of the oil is 830 kg m⁻³ and the density of the water is 1000 kg m⁻³. [Figure showing oil and water in a borehole, with depth x for oil and total depth 2000 m] What is the depth x of the oil?
A907 m
B1000 m
C1090 m
D1270 m
✓ Correct Answer
The correct answer is D: 1270 m
📋 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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