1.
Time of concentration

2.
The specific retention is least in case of

3.
Acidity in water is caused due to

4.
Mathamoglobinemia or blue baby disease is caused due to

5.
The fire demand of a city may be worked out by

6.
If four fires break out in a city of population 40 lakhs and if each hydrant has three streams and duration of each fire is four hours, the total quantity of water required, is

7.
According to IS : 1172-1963, a minimum of 135 litres of water capita per day, is required for

8.
While determining the yield of open wells by the pumping test

9.
Average annual rainfall at any station is the average of annual rainfall over a period of

10.
The R.L. of ground water table on the sides of a valley is 1505 m whereas R.L. of the stream water is 1475 m. If 60° slope consists of pervious soil between R.L. 1485 m to 1500 m, the gravity spring may be expected at the point of reduced level

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