Q.1
The suitable layout of a distribution system for irregularly growing town is
Q.2
The alum, when added as a coagulant in water
Q.3
Standard BOD is measured at
Q.4
The commonly used material for water supply pipes, which has the properties of being strong, not easily corroded and long life but is heavy and brittle, is
Q.5
Assertion A: The consumption of water increases with increase in the distribution pressure.
Reason R: Higher distribution pressure causes more loss and waste of water
Select your answer according to the coding system given below
Q.6
When there is no recirculation of sewage, then recirculation factor is
Q.7
On standard silica scale, the turbidity in drinking water should be limited to
Q.8
Assertion A: Slow sand filters are more efficient in removal of bacteria than rapid sand filters.
Reason R: The sand used in slow sand filters is finer than that in rapid sand filters
Select your answer based on the coding system given below:
Q.9
Which of the following sewers is preferred for combined system of sewage?
Q.10
The most commonly used sewer under culverts is
Q.11
Ground water is usually free from
Q.12
The layout of distribution system in which water flows towards the outer periphery is
Q.13
The settling velocity of a particle in a sedimentation tank increases if
Q.14
Air binding phenomena in rapid sand filters occur due to
Q.15
The detention period for oxidation ponds is usually kept as
Q.16
If the sewage contains grease and fatty oils, these are removed in
Q.17
The design discharge for the separate sewer system shall be taken as
Q.18
The main disadvantage of oxidation pond is that
Q.19
The hydraulic mean depth (HMD) for an egg-shaped sewer flowing two-third full is
Q.20
Settling velocity increases with
Q.21
The per capital consumption of a locality is affected by
(i) Climatic conditions
(ii) Quality of water
(iii) Distribution pressure
Q.22
Alkalinity in water is expressed as milligrams per litre in terms of equivalent
Q.23
The chemical most commonly used to increase speed of sedimentation of sewage is
Q.24
Select the correct statement.
Q.25
The devices which are installed for drawing water from the sources are called
Q.26
The treatment of water with bleaching powder is known as
Q.27
Which of the following causes a decrease in per capita consumption?
Q.28
The process in which the chlorination is done beyond the break point is known as
Q.29
Alum as a coagulant is found to be most effective when pH range of water is
Q.30
The design discharge for the combined sewer system shall be taken as
0 h : 0 m : 1 s