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O Level Physics MCQs – Certification Test 423

Efficiency: O Level Physics MCQ (Question 423) – App & e-Book Download

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MCQ 423: Efficiency of a machine is measured by:

  1. (Wasted Energy Output ⁄ Energy Input) × 100 %
  2. (Energy Input ⁄ Wasted Energy Output) × 100 %
  3. (Useful Energy Output ⁄ Energy Input) × 100 %
  4. (Energy Input ⁄ Useful Energy Output) × 100 %

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