Civil Engineering - Water Supply Engineering MCQs Part 1
1. Surge tanks are used
A.
for storage water
for storage water
B.
to increase the velocity in a pipeline
to increase the velocity in a pipeline
C.
as overflow valves
as overflow valves
D.
to guard against water hammer.
to guard against water hammer.
Answer Option D
2. As per IS : 1172-1963, water required per head per day for average domestic purposes, is
A.
50 litres
50 litres
B.
65 litres
65 litres
C.
85 litres
85 litres
D.
105 litres
105 litres
E.
135 litres.
135 litres.
Answer Option E
3. In slow sland filters, the turbidity of raw water can be removed only up to
A.
60 mg/litre
60 mg/litre
B.
75 mg/litre
75 mg/litre
C.
100 gm/litre
100 gm/litre
D.
150 mg/litre.
150 mg/litre.
Answer Option A
4. Biochemical Oxygen Demand (B.O.D.) of safe drinking water must be
A.
nil
nil
B.
5
5
C.
10
10
D.
15
15
E.
20
20
Answer Option A
5. Acidity in water is caused due to
A.
Mineral acids
Mineral acids
B.
Free CO2
Free CO2
C.
Iron sulphate
Iron sulphate
D.
Aluminium sulphate
Aluminium sulphate
E.
All the above.
All the above.
Answer Option E
6. The transitional middle portion of a logistic curve follows
A. a geometric growth
B. a logarithmic growth
C. a first over curve
D. a constant rate.
Answer Option D
7. 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. Higher copper content affects the lungs
E. All the above.
Answer Option E
8. 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.
Answer Option D
9. The specific retention is least in case of
A. Clay
B. Sand
C. Silt
D. Coarse gravel.
Answer Option D
10. B.O.D. of treated water should be
A. 10 ppm
B. 25 ppm
C. 20 ppm
D. 30 ppm
E. Nil.
Answer Option E
11. 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
E. none of these.
Answer Option A
12. 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
E. none of these.
Answer Option A
13. Distribution mains of any water supply, is normally designed for its average daily requirement
A. 100%
B. 150%
C. 200%
D. 225%.
Answer Option D
14. 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.
Answer Option D
15. 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 Option C
16. P0, P1, P2 be the populations of a city at times t0, t1 and t2 = 2t1, the saturation value of the population Ps of the city, is
A.
B.
C.
D.
E. None of these.
Answer Option A
17. 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 Option D
18. Corrosion of a pipe
A. reduces its life span
B. reduces its carrying capacity
C. adds colour to water
D. adds odour to water
E. all the above.
Answer Option E
19. Most satisfactory formula for an estimate of fire demand Q for a city of population P in thousands for Indian conditions, is
A.
B. Q = 1640 P (1 - 0.01 P)
C. Q = 3180 P
D. none of these.
Answer Option C
20. 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.
Answer Option D
21. According to Kuichling's formula, fire demand in litres per minute for a population of P thousands, is
A. 3182 P
B.
C. 4637 P [1 - 0.01 P]
D. 5663 P.
Answer Option A
22. The maximum permissible nitrites in public water supplies, is
A. Nil
B. 0.5 P.P.M.
C. 1.0. P.P.M.
D. 1.5 P.P.M.
E. 200 P.P.M.
Answer Option A
23. A high velocity of wash water is required for
A. rapid gravity filter with strainers
B. rapid gravity filter without strainers
C. slow sand filter with strainers
D. slow sand filter without strainers
E. none of these.
Answer Option B
24. In distribution pipes, drain valves are provided at
A. lower point
B. higher point
C. junction points
D. any where.
Answer Option A
25. Corrosion of well pipes may not be reduced by
A. reducing the draw down and the pumping rate
B. reducing the flow velocity
C. using thicker pipes
D. using screens having larger area of openings
E. none of these.
Answer Option D
26. Manholes along the mains from the source to a city are provided at 500 m intervals in
A. steel pipes
B. R.C.C. pipes
C. hume steel pipes
D. all the above.
Answer Option D
27. The population growth curve is
A. S-shaped curve
B. parabolic curve
C. circular curve
D. straight line
E. none of these.
Answer Option A
28. Turbidity of raw water is a measure of
A. suspended solids
B. acidity of water
C. B.O.D.
D. none of these.
Answer Option A
29. If V is total consumption of water in litres for a population of N individuals, per capita consumption or water allowance for the water supply Q, is given by
A.
B.
C.
D. none of these.
Answer Option C
30. Water supply includes
A. collection, transportation and treatment of water
B. distribution of water to consumers
C. provision of hydrants for fire fighting
D. mains, sub-mains and branch lines of water supply
E. all the above.
Answer Option E
31. Asbestos pipes are
A. light in weight and easy to transport
B. highly resistant to corrosion
C. high flexible to accommodate deflection upto 12°
D. very much smooth and hydraulically efficient
E. all the above.
Answer Option E
32. The maximum depth of sedimentation tanks is limited to
A. 2 m
B. 3 m
C. 4 m
D. 5 m
E. 6 m.
Answer Option E
33. By boiling water, hardness can be removed if it is due to
A. calcium sulphate
B. magnesium sulphate
C. calcium nitrate
D. calcium bicarbonate
E. none of these.
Answer Option D
34. Q is the discharge from an unconfined tube well with depression head s through its pipe of radius rw. If the radius of influence is R, the length of the required strainer, is
A.
B.
C.
D.
Answer Option C
35. For determining the velocity of flow of underground water, the most commonly used non-empirical formula is
A. Darcy's formula
B. Slichter's formula
C. Hazen's formula
D. Lacy's formula.
Answer Option A
36. The least thickness of class B cast iron (spun) pipe, is
A. 7.2 mm
B. 7.9 mm
C. 8.6 mm
D. 10 mm.
Answer Option C
37. According to IS : 1172-1963, a minimum of 135 litres of water capita per day, is required for
A. Boarding schools
B. Nurses home and medical quarters
C. hostels
D. all the above.
Answer Option D
38. The R.L. of ground water table on the sides of a valley is 1505 m whereas R.L. of the stream water is 1475 m. If 60° slope consists of pervious soil between R.L. 1485 m to 1500 m, the gravity spring may be expected at the point of reduced level
A. 1500 m
B. 1505 m
C. 1475 m
D. 1485 m.
Answer Option D
39. The factor affecting per capita demand, is
A. size of the city
B. climatic conditions
C. pressure in water mains
D. cost of water
E. all the above.
Answer Option E
40. Pick up the incorrect statement from the following. The underground sources of water, is from
A. wells
B. springs
C. infiltration wells
D. storage reservoirs
E. none of these.
Answer Option D
41. Disinfection of drinking water, is done to remove
A. odour
B. bacterias
C. turbidity
D. colour.
Answer Option B
42. Sunlight
A. helps growth of bacterias
B. impedes growth of algae
C. increases dissolved oxygen content
D. reduces turbidity.
Answer Option B
43. The expected discharge to be obtained from an open well sunk in coarse sand is 0.0059 cumec. If the working depression head of the well is 3 m, the minimum diameter of the well, is
A. 2 m
B. 2.25 m
C. 2.50 m
D. 2.75 m
E. 3.00 m.
Answer Option E
44. Average annual rainfall at any station is the average of annual rainfall over a period of
A. 7 years
B. 14 years
C. 21 years
D. 28 years
E. 35 years.
Answer Option E
45. Time of concentration
A. is the time taken, for precipitation
B. duration of rainfall.
C. time taken for all the ran off to reach the drain
D. time taken for the storm water to travel from the most remote point to the drain.
Answer Option D
46. If four fires break out in a city of population 40 lakhs and if each hydrant has three streams and duration of each fire is four hours, the total quantity of water required, is
A. 1880 kilo litres
B. 2880 kilo litres
C. 3880 kilo litres
D. 4880 kilo litres.
Answer Option B
47. The fire demand of a city may be worked out by
A. Kuichling's formula
B. Freeman formula
C. Under Writers formula
D. Bustan's formula
E. All the above.
Answer Option E
48. Aeration of water is done to remove
A. odour
B. colour
C. bacterias
D. hardness
E. turbidity.
Answer Option A
49. 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
E. 35 times.
Answer Option D
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