The power of a motor pump in a house is $20 W$ . How much water per minute can the pump raise to a height of $10 m$ ?
Take acceleration due to gravity $g = 10 m s^{- 2}$

Q. Q. A power of motor is 1500W .How much water per minute can the pump raise to a height of 10m ? (g=10 m/s²)

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A 750W motor drives a pump which lifts 300 litres of water per minute to a height of 6 meters. The efficiency of the motor is nearly (take acceleration due to gravity to be 10m/s2).

The correct option is D 40%Energy required to lift water is E 300×10×6=18000jenergy consumed by motor E1=750×60=45000efficiency=18000×10045000=40%

A $750 W$ motor drives a pump which lifts $300$ litres of water per minute to a height of $6$ meters. The efficiency of the motor is nearly (take acceleration due to gravity to be $10 m / s^{2})$ .

The correct option is D $40$ %
Energy required to lift water is E $300 \times 10 \times 6 = 18000 j$
energy consumed by motor $E_{1} = 750 \times 60 = 45000$
efficiency= $\frac{18000 \times 100}{45000} = 40$ %