Increase in population of a rapidly growing city, may be estimated by

The formula for the head loss in conduits is generally known as

The most commonly used chemical for dechlorination of water, is

Disappearance of pink colour of water of a well due of KMnO₄ indicates that water contains

Mostly used coagulant, is

The maximum permissible colour for domestic supplies based on cobalt scale, is

Mathamoglobinemia, or blue baby disease is caused due to

The formula for the head loss in conduits is generally known as

After cleaning a slow sand filter, the filtered water is not used for

The prescribed hardness limit of potable water ranges between

Water is supplied from the source to the treatment plant under gravity in

Shales are

The dilution ratio at which the odour is hardly detectable is generally called threshold odour number and for public supplies it should not exceed

The main process to purify water by filtration, is

A pressure conduit laid under ground, may not be subjected to

The standard B.O.D. at 20&Deg;C, is taken for the consumption in

For centrifugal pumps

The standard B.O.D. at 20&Deg;C, is taken for the consumption in

Water is distributed to consumers by gravitational system, in

Velocity of flow of water in plain sedimentation water tank, is normally kept

The joint used for joining the plain ends of cast iron pipes, is

The period of cleaning of a slow sand filter, is usually

If G is the specific gravity of particles of diameter d, the velocity of settlement V in still water at T°C, according to Stoke's law, is

The cast iron pipes for water supply system are used for

In distribution pipes, air valves are provided at

The most important and widely used tube well in India, is

Pick up the incorrect statement from the following. The source of surface water is from

litres of water per person per day, is provided in

Growth of population can be conveniently represented by

The bacterias which may survive with or without free oxygen, are called