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
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
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
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