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Physics · May / June 2024 · Paper 12 · Question 16

5054Efficiency

A 15 W lamp is turned on for 30 minutes. It wastes 7000 J of energy. What is the efficiency of the lamp?

  1. A0.26
  2. B0.35
  3. C0.59
  4. D0.74

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Correct answer: D. 0.74

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