The diagram shows a hydroelectric power station. [Figure showing a reservoir, a pipe (penstock) leading down to a turbine house, and points X (in reservoir) and Y (just before turbine).] The reservoir is linked to the turbines by a pipe of uniform cross-sectional area. Water flows from X to Y at constant speed. Which statement about the change of energy of the water as it moves from X to Y is correct?
✓ Correct Answer
The correct answer is D: It loses gravitational potential energy and gains elastic potential energy.
📋 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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