2) Rain water harvesting means about

3) Density of a fluid is expressed in

4) The capacity of a tank measuring 1m x 1m x 1m is

5) The filling time required for a tank having capacity 1500 liters by a pump duty of 0.5 liters per second

6) Find the HP of pumpset with efficiency of 50 percent required to fill a water storage tank at a discharge rate of 120 litres per second and the total head of 20 meters is