A-LevelPhysicsForces, density and pressureFeb/Mar 2022Paper 1 Q131 Mark
A rigid sphere is held at rest on the sea bed. When the sphere is released, it rises to the surface of the sea. The seawater has a uniform density. Which statement about the sphere, from its release until it reaches the surface, is correct?
AThe sphere always moves with constant acceleration.
BThe sphere always moves with constant velocity.
CThe upthrust on the sphere always decreases.
DThe upthrust on the sphere is always constant.
✓ 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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