JEE Main Physics question
An electric pump is used to fill an overhead tank of capacity 9 m³ kept at a height of 10 m above the ground. If the pump takes 5 minutes to fill the tank by consuming 10 kW power, the efficiency of the pump should be (Take g = 10 ms⁻²)
Answer: (D)
Solution
Work done in raising the water = mgh = (volume × density) × gh = (9×1000)(10)(10) = 9×10⁵ J. Useful
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