Question

The power of water pump is The power of water pump is $4kW.$ If $(g=10m{s}^{-2}),$ the amount of water it can raise in $1$ minute to a height of $20m$ is then

• A. $100$ litre
• B. $1000$ litre
• C. $1200$ litre
• D. $2000$ litre

Answer 1

The correct option is C $1200$ litre

Given that,

Power, $P=4kW=4000W$

Height, $h=20m$

Time, $t=60\sec$

$power=\frac{work}{time}$

$4000=\frac{mgh}{t}$

$4000=\frac{m\times 10\times 20}{60}$

$m=1200Kg$

The pump can raise 1200 litre in one minute