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Work, Power and Energy: JEE — Power as Rate of Energy MCQ

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JEE — Power as Rate of EnergyMediumQuestion 30461

Question

A motor pumps water (density 1000 kg/m³) at 2 m³/min to a height of 5 m. Power needed (ignoring pipe friction): (g = 10)
  1. A
    167 W
  2. B
    1667 W
    Correct
  3. C
    10000 W
  4. D
    1000 W

Correct answer

1667 W

Explanation

Mass flow rate = 1000 × 2/60 = 33.3 kg/s. Power = mgh/t = 33.3 × 10 × 5 = 1667 W.

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