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Question

The power of a motor pump in your neighbour's house is 20 W. How much water can be pumped per minute to raise the height to 10 m ?

Take g=10 ms1.



Your Answer
A

6 kg

Your Answer
B

20 kg

Correct Answer
C

12 kg

Your Answer
D

24 kg


Solution

The correct option is C

12 kg


Given power = 20 W, height =10 m.

Work done = mgh
and, power=Work  doneTime  taken
So,20=m×10×1060
Therefore, mass = 12 kg

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