O Level Physics Cerification Guide: Certification Test 423

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MCQ: 423

Efficiency of a machine is measured by

(Wasted Energy Output ⁄ Energy Input) × 100 %
(Energy Input ⁄ Wasted Energy Output) × 100 %
(Useful Energy Output ⁄ Energy Input) × 100 %
(Energy Input ⁄ Useful Energy Output) × 100 %

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