A-LevelPhysicsForces, density and pressure9702/12 · May/June 2013 · 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?

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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

D: There is a difference in water pressure acting on the top and on the bottom of the submarine.

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Topic: Forces, density and pressure, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2013 Paper 1 Variant 2, question 11.

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