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Free download in PDF Water Supply Engineering Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(1)
Pick up the correct statement from the following :
[A]
Detention period for plain sedimentation tanks ranges between 4 to 8 hours
[B]
Detention period for sedimentation tanks, using coagulants usually ranges between 2 to 4 hours
[C]
The horizontally flow velocity in sedimentation tanks, is generally limited to 0.3 m/minute
[D]
All the above.
(2)
Corrosion of a pipe
[A]
reduces its life span
[B]
reduces its carrying capacity
[C]
adds colour to water
[D]
all the above.
(3)
Water supply system includes
[A]
digging a well for water
[B]
construction of dams
[C]
construction of canals
[D]
entire arrangement from source to distribution.
Answer: entire arrangement from source to distribution.
(4)
In pressure supply mains, water hammer pressure is reduced by providing
[A]
sluice valves
[B]
air valves
[C]
pressure relief valves
[D]
none of the these
Answer: pressure relief valves
(5)
If pH value of water is
[A]
7 water it is said to be neutral
[B]
less than 7 it is said to be acidic
[C]
more than 7 it is said to be alkaline
[D]
all the above.
(6)
Distribution mains of any water supply, is normally designed for its average daily requirement
[A]
100%
[B]
150%
[C]
200%
[D]
225%.
(7)
Economic height of a dam is the height corresponding to which
[A]
cost of the dam per unit of storage is minimum
[B]
amount of silting is less
[C]
cost of dam per unit storage is maximum
[D]
free board provided is least
Answer: cost of the dam per unit of storage is minimum
(8)
Most commonly used pump for lifting water in water supply mains, is
[A]
axialflow pump
[B]
reciprocating pump
[C]
rotary type pump
[D]
centrifugal pumps
(9)
B.O.D. of treated water should be
[A]
10 ppm
[B]
25 ppm
[C]
30 ppm
[D]
Nil
(10)
The specific retention is least in case of
[A]
Clay
[B]
Sand
[C]
Silt
[D]
Coarse gravel
(11)
Pick up the incorrect statement from the following regarding fire hydrants
[A]
Fire hydrants are fitted in water mains at 100 m to 150 m apart at fire
[B]
The minimum water pressure hydrants, is kept 1.5 kg/cm2
[C]
The water at pressure 1 to 1.5 kg/cm2 is made available for 4 to 5 hours for constant use
[D]
None of these
(12)
Pick up the correct statement from the following :
[A]
Excess quantities of iron and manganese in water, cause discolouration of clothes
[B]
Lead and barium salts have toxic effect
[C]
Arsenic and selenium are poisonous to human health
[D]
All the above
(13)
The transitional middle portion of a logistic curve follows
[A]
constant rate
[B]
first over curve
[C]
logarithmic growth
[D]
geometric growth
(14)
Acidity in water is caused due to
[A]
Mineral acids
[B]
Free CO2
[C]
Iron sulphate
[D]
All the above
(15)
Biochemical Oxygen Demand (B.O.D.) of safe drinking water must be
[A]
nil
[B]
5
[C]
10
[D]
20
(16)
In slow sland filters, the turbidity of raw water can be removed only up to
[A]
60 mg/litre
[B]
75 mg/litre
[C]
100 gm/litre
[D]
150 mg/litre.
(17)
As per IS : 1172-1963, water required per head per day for average domestic purposes, is
[A]
50 litres
[B]
135 litres
[C]
105 litres
[D]
65 litres
(18)
Surge tanks are used
[A]
for storage water
[B]
to increase the velocity in a pipeline
[C]
as overflow valves
[D]
to guard against water hammer
Answer: to guard against water hammer
(19)
The yield of a rapid gravity filter as compared to that of slow sand filter, is
[A]
10 times
[B]
15 times
[C]
20 times
[D]
30 times
(20)
Aeration of water is done to remove
[A]
odour
[B]
colour
[C]
bacterias
[D]
hardness
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