Pick up the incorrect statement from the following :

The valve fitted closely in a recess against an opening in a pipe, is generally

Pick up the correct statement from the following :

In rapid sand filters the ratio of length and diameter of the lateral, should not be greater than

Surface water may

The duration of contact of chlorine with water before it is served to the first consumer, should be at least

To pump water from a water reservoir 3 m deep and maximum water level atm, a pump is installed to lift water up to R.L.m at a constant rate oflitres per hour. If the length of the pipe ism and f = 0.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

The maximum non-verticality of the bore of a wellm deep, may be permitted up to

Pick up the incorrect statement from the following :

Rapid gravity filters can remove bacterial impurities up to a maximum of

The gaseous form of chlorine gets converted into liquid form when subjected to a pressure of

Pick up the correct statement from the following :

The efficiency of a pumping set, is generally assumed

When gravity and pumping systems of water distribution are adopted, the type of distribution reservoir, is

The gaseous form of chlorine gets converted into liquid form when subjected to a pressure of

For calculation of economical diameter D of a pipe in metres for a discharge Q to be pumped in cumecs, Lea suggested the empirical formula

Pressure relief valves are provided in water mains

Alkalinity in water may be caused due to

Suction lift of a pump depends upon

Pick up the correct statement from the following :

Manholes are less common in

Raw water treated with only chlorine, is known as

Capacity of soil to absorb moisture, is generally known as

For controlling algae, the most commonly used chemical, is

The maximum permissible hardness for public supplies is

For a city developed haphazardly, the layout of distribution pipes preferred to, is

The diameter of pipes in bath rooms and lavatories in domestic water supply, is

By adding 1 ml of orthotolidine solution toml chlorinated water taken after contact period, the residual chlorine makes the colour of solution

Water may not contain much impurities if its source is

Cast iron pipes