Civil Engineering - Water Supply Engineering MCQs Part 3
1. The most commonly used chemical for dechlorination of water, is
A.
sodium thiosulphate
sodium thiosulphate
B.
sodium bisulphate
sodium bisulphate
C.
sodium sulphite
sodium sulphite
D.
sulphur-dioxide
sulphur-dioxide
E.
all the above.
all the above.
Answer Option C
2. The prescribed hardness limit of potable water ranges between
A.
50 to 75 P.P.M.
50 to 75 P.P.M.
B.
75 to 115 P.P.M.
75 to 115 P.P.M.
C.
100 to 150 P.P.M.
100 to 150 P.P.M.
D.
150 to 200 P.P.M.
150 to 200 P.P.M.
E.
none of these.
none of these.
Answer Option B
3. For centrifugal pumps
A.
initial cost is low
initial cost is low
B.
limited space is required
limited space is required
C.
the discharge obtained is steady and non-pulsating
the discharge obtained is steady and non-pulsating
D.
all the above.
all the above.
Answer Option D
4. The cast iron pipes for water supply system are used for
A.
durability
durability
B.
strength
strength
C.
easy connection
easy connection
D.
low maintenance cost
low maintenance cost
E.
all the above.
all the above.
Answer Option E
5. For plain chlorination of water, the quantity of chlorine used, is
A.
0.1 mg/litre
0.1 mg/litre
B.
0.2 mg/litre
0.2 mg/litre
C.
0.3 mg/litre
0.3 mg/litre
D.
0.4 mg/litre
0.4 mg/litre
E.
0.5 mg/litre.
0.5 mg/litre.
Answer Option E
6. For estimating the run off of catchments, the mean value of the constant 'K' in the Khosla's formula Qy = Py - K (1.8 Ty + 32) is
A. 1.21
B. 1.23
C. 1.25
D. 1.27
E. 1.31
Answer Option D
7. Service connections to consumers houses, are generally provided with
A. copper pipes
B. hume pipes
C. galvanised iron pipes
D. P.V.C. pipes
E. none of these.
Answer Option C
8. Sluice valves are fitted in a distribution system
A. along straight length of pipes at suitable intervals
B. at the junctions of the pipes
C. at the branching off points of sub-mains
D. all the above.
Answer Option D
9. The detention period for plain sedimentation water tanks, is usually
A. 4 to 8 hours
B. 8 to 16 hours
C. 16 to 24 hours
D. 24 to 36 hours.
Answer Option A
10. The maximum permitted loss of head in a rapid sand filter, is
A. 1 m
B. 2 m
C. 3 m
D. 4 m
E. 5 m.
Answer Option C
11. Mud balls may be removed by
A. breaking and washing
B. washing the filter with a solution of caustic soda
C. removing, cleaning and replacing the damaged sand
D. all the above.
Answer Option D
12. For maximum alkalinity of water, pH value should be
A. zero
B. less than 7
C. more than 7
D. 14
E. 21
Answer Option D
13. The fire demand for a city of 50, 000 population, according to Godrich formula, is
A. 40 mld
B. 42 mld
C. 44 mld
D. 48 mld.
Answer Option C
14. The efficiency of sedimentation tank does not depend upon
A. depth of tank
B. length of tank
C. detention period
D. velocity of water.
Answer Option A
15. When the reduced level of the water source is higher than the reduced level of the consumer's place, water is generally supplied
A. by pumping system
B. by gravitational system
C. both (a) and (b)
D. all the above.
Answer Option B
16. Most commonly used section in grade aqueducts, is
A. circular
B. rectangular
C. parabolic
D. horse shoe section.
Answer Option B
17. Pressure exerted at 90° bend in a pipe of cross-sectional area A and carrying water with a velocity V under a pressure p, is
A.
B.
C.
D.
Answer Option C
18. The lowest outlet sluice in a dam is provided
A. below the dead storage
B. on the top level of dead storage
C. on the top level of useful storage
D. at the centre of the dam.
Answer Option B
19. The four major water supply distribution systems, are
A. dead end, tree, grid iron and reticulation
B. dead end, tree, grid iron and circular
C. tree, grid iron, ring and radial
D. tree, reticulation, circular and ring.
Answer Option C
20. Most important source of water for public water supply, is from
A. lakes
B. ponds
C. streams
D. rivers
E. sea.
Answer Option D
21. In pumping stations, the type of joint generally used, is
A. socket and spigot joint
B. flanged joint
C. expansion joint
D. dresser coupling joint
E. flexible joint.
Answer Option B
22. The permissible pH value for public water supplies may range between
A. 4.5 to 5.5
B. 5.5 to 6.5
C. 6.5 to 8.5
D. 8.5 to 10.5
E. none of these.
Answer Option C
23. The strainer type tube well, is unsuitable for
A. coarse gravels
B. fine sandy strata
C. clean gravels
D. none of these.
Answer Option B
24. Pick up the correct statement from the following :
A. Lime may be used to soften the hard water
B. Excessive use of lime may kill the bacterias
C. Excessive lime when added to water, raises its pH value
D. When lime raises pH value of water to about 9.5, 100% bacterias are removed
E. All the above.
Answer Option E
25. Specific capacity or yield of wells, is generally expressed, as
A. m3 per sec
B. m3/hour
C. m3/hour/m2
D. m3/hour/m2/m
E. m3/hour/m2/sec.
Answer Option D
26. The depth of the water table at a place is 45 m below the general ground level. To lift water from a deep tube well in such a locality, the type of pump to be installed is
A. Centrifugal pump
B. Reciprocating pump
C. Deep well turbine pump
D. None of these.
Answer Option C
27. Critical time for developing a water hammer, is the time required for
A. closing the valve
B. the wave to travel from valve to the reservoir
C. the wave to travel from the valve to the reservoir and back
D. none of these.
Answer Option C
28. According to Buston'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
E. none of these.
Answer Option D
29. The ratio of maximum hourly consumption and average hourly consumption of the maximum day, is
A. 1.2
B. 1.5
C. 1.8
D. 2.4
E. 2.7
Answer Option E
30. Cast iron pipes are generally preferred to, because
A. of moderate cost
B. of ease to join
C. of durability
D. of longer life
E. all the above.
Answer Option E
31. The fire demand for ascertaining the empirical formula known as
A. Kuichling's formula
B. Buston's formula
C. Freeman formula
D. Under Writers formula
E. None of these.
Answer Option C
32. To detect the turbidity of the order of 0 to 1000 P.P.M. the instrument used is
A. turbidimeter
B. Jackson turbidimeter
C. Baylis turbidimeter
D. Hallige turbidimeter.
Answer Option C
33. Standard process of chlorination of water, is done by
A. plain chlorination
B. pre-chlorination
C. post-chlorination
D. double chlorination.
Answer Option C
34. If the chosen diameter of a pipe, is less than the economical diameter
A. cost of pipe will be less
B. head loss will be high
C. cost of pumping will be more than saving
D. all the above.
Answer Option D
35. Water gets evaporated from water surfaces and land surfaces, get converted into water drops at lower temperatures, flows over ground surface and finally meets its source, i.e. lake, sea, etc. This entire process is generally known as
A. hydrological cycle
B. water cycle
C. evaporation and precipitation cycle
D. all the above.
Answer Option D
36. In the equation of a logistic curve of population growth, the constant m is
A. Ps x P
B.
C.
D. KPs .
Answer Option C
37. High pH value of water does not produce
A. incrustation
B. sediment deposits
C. turberculation
D. corrosion
E. both (c) and (d).
Answer Option E
38. Distribution of wash water is provided in
A. sedimentation tank
B. slow sand filter
C. rapid gravity filter
D. all the above.
Answer Option C
39. The valves provided at low points of pipes to drain off water quickly under gravity, are called
A. blow off valves
B. drain valves
C. sewer valves
D. all the above.
Answer Option D
40. Pick up the incorrect statement from the following :
A. Free surface ground water is subjected to atmospheric pressure
B. Water table surface rises and falls with seasons
C. Depth of water table is directly proportional to the rate of drawal of water
D. Level of water table remains stationary
E. None of these.
Answer Option D
41. The bacterias which require free oxygen for their survival, are called
A. Aerobic bacterias
B. Anaerobic bacterias
C. Faculative bacteria
D. None of these.
Answer Option A
42. Maximum threshold number permitted for indicating the odour of public water supplies, is
A. 1
B. 2
C. 3
D. 4
E. 5
Answer Option C
43. 45 litres of water per person per day, is provided in
A. office buildings
B. hotels
C. hostels
D. nurse's homes.
Answer Option A
44. Turbidity of water may be caused due to
A. Suspended clay
B. Suspended silt
C. finely divided organic material
D. all the above.
Answer Option D
45. Pick up the correct statement from the following :
A. Water with hardness upto 75 ppm is considered soft
B. Water with hardness more than 200 ppm is considered hard
C. Water needed for laundaries should contain hardness less than 75 ppm
D. To provide taste during drinking, water should possess hardness between 75 to 120
E. All the above.
Answer Option E
46. The maximum pressure to which cast iron pipes may be subjected to, is
A. 3 kg/cm2
B. 5 kg/cm2
C. 7 kg/cm2
D. 10 kg/cm2.
Answer Option C
47. The type of pipe commonly used in water supply distribution schemes, is
A. R.C.C. pipes
B. Hume pipes
C. Cast iron pipes
D. G.I. pipes.
Answer Option C
48. The valve shown in the below figure, is generally known as
A. air valve
B. pressure relief valve
C. sluice valve
D. none of these.
Answer Option B
49. The population of a city in 2000 is 50, 000. The average per decade of the previous records of population is 5000 and average percentage per decade is 20%. The population of the city based on geometrical increase method, in the year 2020 will be
A. 56, 000
B. 60, 000
C. 64, 000
D. 70, 000
E. 72, 000
Answer Option E
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