A overhead tank of capacity 1000 liter has to be filled in 
hour using water pump. Tank is kept at a height 10 m above ground and water level is 10 m below ground. The opening of inlet pipe inside tank is 1.11 cm 2 . Assuming the efficiency of motor to be 60%, the electric power used is (Neglect viscosity) -
Text Solution
Verified by ExpertsThe correct answer is:
D
Volume rate of water filling tank:
Av = 
v = 5 m/s
work done by pump in filling the tank
W = mgh + 
mv 2
[m = 1000 kg, h = 20 m, v = 5 m/s]
= 2.125 × 10 5 
P = 
W
Electric power used = 
= 198 W
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