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Physics (AS & A Level) · May / June 2024 · Paper 11 · Question 18

9702Energy conservation

Which statement about efficiency is correct?

  1. AEfficiency does not have a unit.
  2. BThe joule is a unit of efficiency.
  3. CThe metre is a unit of efficiency.
  4. DThe watt is a unit of efficiency.

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Correct answer: A. Efficiency does not have a unit.

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