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Question 30470
JEE Physics · Medium

Work, Power and Energy: JEE — Efficiency MCQ

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JEE — EfficiencyMediumQuestion 30470

Question

A machine does 500 J of useful work with 2000 J of input energy. Efficiency is:
  1. A
    25%
    Correct
  2. B
    4%
  3. C
    75%
  4. D
    40%

Correct answer

25%

Explanation

Efficiency = useful output/input × 100 = 500/2000 × 100 = 25%.

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