A-LevelPhysicsWork, energy and powerMay/June 2015Paper 1 Q161 Mark
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?
AIt gains both gravitational potential energy and kinetic energy.
BIt loses both elastic potential energy and kinetic energy.
CIt loses both elastic potential energy and gravitational potential energy.
DIt loses gravitational potential energy and gains elastic potential energy.
✓ Correct Answer
The correct answer is D. This question tests the candidate's understanding of work, energy and power 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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