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Physics (AS & A Level) · May / June 2019 · Paper 13 · Question 15

9702Energy conservation

Which statement about the principle of conservation of energy is correct?

  1. AEnergy conversion helps to conserve energy sources.
  2. BEnergy is conserved only in systems with an efficiency of 100%.
  3. CThe supply of energy is limited so energy should be conserved.
  4. DThe total amount of energy in a closed system is constant.

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Correct answer: D. The total amount of energy in a closed system is constant.

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