O Level Physics MCQs – Certification Test 779

Efficiency: O Level Physics MCQ (Question 779) – Learning App & e-Book Download

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MCQ: 779

An elevator motor is used to lift 1000 N load to a height of 0.25 km. If the total amount of energy input is 1MJ, which of the following pairs of values of energy wasted and efficiency are correct?

Energy wasted = 750 kJ, Efficiency = 75 %
Energy wasted = 500 kJ, Efficiency = 75 %
Energy wasted = 500 kJ, Efficiency = 25 %
Energy wasted = 750 kJ, Efficiency = 25 %

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