Q.1
If the chosen diameter of a pipe, is less than the economical diameter
Q.2
Turbidity of raw water is a measure of
Q.3
The expected discharge to be obtained from an open well sunk in coarse sand is 0.0059 cumec. If the working depression head of the well is 3 m, the minimum diameter of the well, is
Q.4
In distribution pipes, drain valves are provided at
Q.5
The least thickness of class B cast iron (spun) pipe, is
Q.6
Biochemical Oxygen Demand (B.O.D.) of safe drinking water must be
Q.7
For determining the velocity of flow of underground water, the most commonly used non-empirical formula is
Q.8
Aeration of water is done to remove
Q.9
Asbestos pipes are
Q.10
The maximum depth of sedimentation tanks is limited to
Q.11
Corrosion of well pipes may not be reduced by
Q.12
Pick up the incorrect statement from the following. The underground sources of water, is from
Q.13
The yield of a rapid gravity filter as compared to that of slow sand filter, is
Q.14
Disinfection of drinking water, is done to remove
Q.15
Specific capacity or yield of wells, is generally expressed, as
Q.16
Pick up the correct statement from the following:
Q.17
For the prediction of future population of a city, the factor to be considered, is
Q.18
The factor affecting per capita demand, is
Q.19
By boiling water, hardness can be removed if it is due to
Q.20
As per IS : 1172-1963, water required per head per day for average domestic purposes, is
Q.21
Pick up the correct statement from the following:
Q.22
To pump water from a water reservoir 3 m deep and maximum water level at 135 m, a pump is installed to lift water up to R.L. 175 m at a constant rate of 36,00,000 litres per hour. If the length of the pipe is 1506 m and f = 0.01, ignoring other minor losses and assuming the economical diameter from Lea's formula D = 1.2 √Q, the water horse power of the pump is
Q.23
The process of passing water through beds of granular materials, is called
Q.24
Surcharge storage zone of a reservoir, is
Q.25
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
Q.26
Average annual rainfall at any station is the average of annual rainfall over a period of
Q.27
While determining the yield of open wells by the pumping test
Q.28
In slow sland filters, the turbidity of raw water can be removed only up to
Q.29
When the reduced level of the water source is higher than the reduced level of the consumer's place, water is generally supplied
Q.30
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