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JEE Main Physics question

PhysicsWork, Energy and PowerJEE Main

An electric pump on the ground floor of a building takes 15 minutes to fill a tank of volume 25 m³ with water. If the tank is 80 m above the ground and the efficiency of the pump is 15%, the electric power consumed by the pump in filling the tank is kW. (Take g = 10 m/s²)

Answer: 148.15

Solution

Mass of water to be lifted M = ρV = 1000×25 = 25×10³ kg. Work done to lift this water to height h: W = Mgh = 25×10³×10×80 = 2×10⁷ J. Since the efficiency of the pump is

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Question ID VK-154232