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1.7 Energy, work and power

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Question 439

A water pump is used to lift a fixed volume of water through a vertical height of 5.0 m.

The operator then increases the electrical input power to the pump while keeping the efficiency of the pump the same.

Which row correctly describes the effect this has on the useful work done lifting the water and the time taken to lift it?

A

Useful work done: stays the same; Time taken: increases

B

Useful work done: stays the same; Time taken: decreases

C

Useful work done: increases; Time taken: decreases

D

Useful work done: increases; Time taken: stays the same

Markscheme

1.7 Energy, work and power Questions

  1. IGCSE
  2. /Physics
  3. /1.7 Energy, work and power

533 exam-style questions on CIE IGCSE Physics 1.7 Energy, work and power, covering 1.7.1a Energy stores and energy transfers, 1.7.1b Conservation of energy, 1.7.1c Kinetic and gravitational potential energy, 1.7.2 Work done, 1.7.3 Energy resources, 1.7.3a Energy resources and electricity generation, 1.7.3b Nuclear fusion as an energy source, 1.7.3c Efficiency of energy transfer, and 1.7.4 Power. Each one has a worked solution and a mark scheme showing where the marks go.

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