DATABASE PROCESSING FOR BIS QUIZ

Time of concentration

duration of rainfall.

time taken for the storm water to travel from the most remote point to the drain.

is the time taken, for precipitation

time taken for all the ran off to reach the drain

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For determining the velocity of flow of underground water, the most commonly used non-empirical formula is

Slichter’s formula

Hazen’s formula

Darcy’s formula

Lacy’s formula

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By boiling water, hardness can be removed if it is due to

calcium sulphate

calcium nitrate

magnesium sulphate

calcium bicarbonate

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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

4880 kilo litres

3880 kilo litres

1880 kilo litres

2880 kilo litres

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Surge tanks are used

as overflow valves

to guard against water hammer

to increase the velocity in a pipeline

for storage water

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

28 years

35 years

14 years

21 years

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The specific retention is least in case of

Silt

Clay

Coarse gravel.

Sand

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The factor affecting per capita demand, is

climatic conditions

cost of water

size of the city

All listed here

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If the chosen diameter of a pipe, is less than the economical diameter

Head loss will be high

Cost of pumping will be more than saving

All listed here

Cost of pipe will be less

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

All listed here

hostels

Nurses home and medical quarters

Boarding schools

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