A-LevelPhysicsForces, density and pressureMay/June 2013Paper 1 Q111 Mark
A submarine is in equilibrium in a fully submerged position. [Figure showing a cross-section of a submarine with steel, air, and sea water labeled] What causes the upthrust on the submarine?
AThe air in the submarine is less dense than sea water.
BThe sea water exerts a greater upward force on the submarine than the weight of the steel.
CThe submarine displaces its own volume of sea water.
DThere is a difference in water pressure acting on the top and on the bottom of the submarine.
✓ Correct Answer
The correct answer is D. This question tests the candidate's understanding of forces, density and pressure within the Physicssyllabus. The examiner's mark scheme requires...
📋 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...
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