A-LevelPhysicsForces, density and pressureOct/Nov 2020Paper 5 Q215 Marks
A student investigates the behaviour of a liquid inside a narrow tube, as shown in Fig. 2.1. d h liquid [Figure 2.1] (not to scale) When the tube is placed in the liquid, the liquid rises in the tube. The student measures the internal diameter d of the tube and the maximum height h that the liquid rises in the tube. The experiment is repeated for tubes of different diameter. It is suggested that h and d are related by the equation h = 4σ / (dρg) where ρ is the density of the liquid, g is the acceleration of free fall and σ is a constant.
📋 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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