Civil Engineering - Water Supply Engineering MCQs Part 5
1. The most ideal disinfectant used for drinking water throughout the world, is
A.
alum
alum
B.
lime
lime
C.
chlorine
chlorine
D.
nitrogen
nitrogen
E.
ammonia.
ammonia.
Answer Option C
2. A centrifugal pump is required to be primed before starting if it is located
A.
at higher level than water level of reservoir
at higher level than water level of reservoir
B.
at lower level than water level of reservoir
at lower level than water level of reservoir
C.
both (a) and (b)
both (a) and (b)
D.
neither (a) nor (b).
neither (a) nor (b).
Answer Option A
3. The maximum pressure which the pipe can withstand without any leakage during hydrostatic pressure test, is called
A.
Working pressure
Working pressure
B.
Design pressure
Design pressure
C.
Test pressure
Test pressure
D.
Hydrostatic pressure.
Hydrostatic pressure.
Answer Option C
4. Filtration of water is done to remove
A.
colour
colour
B.
odour
odour
C.
turbidity
turbidity
D.
pathogenic bacteria
pathogenic bacteria
E.
all the above.
all the above.
Answer Option C
5. Generally, first portion of a logistic curve for the population growth of a developing city, represents the growth of
A.
increasing
increasing
B.
decreasing
decreasing
C.
constant
constant
D.
all the above.
all the above.
Answer Option A
6. Ground water from artesian wells
A. contains no suspended materials
B. contains dissolved salts
C. may be saltish and hard
D. generally require lesser treatment
E. all the above.
Answer Option E
7. Property of earth to allow water to pass through it, is known as
A. perviousness
B. porosity
C. permeability
D. transmissibility.
Answer Option A
8. Derivation of Thiem's formula is based on the assumption
A. the aquifer is homogeneous, isotropic and of infinite depth and area
B. the well is sunk through the full depth of the aquifer
C. the flow lines are radial and horizontal, and the flow is laminar
D. for hydraulic gradient in Darcy's equation, tangent value is used for sine value
E. all the above.
Answer Option E
9. Pick up the incorrect statement from the following :
A. Porosity of clay sand soil is 45%
B. Porosity of pure sand is 35%
C. Porosity of sand stone is up to 15%
D. Least porosity is that of granite and quartz
E. None of these.
Answer Option E
10. Water is supplied from the source to the treatment plant under gravity in
A. Calcutta
B. Delhi
C. Madras
D. Bombay.
Answer Option D
11. Normal values of overflow rate for sedimentation tanks using coagulants in litres/hr/m2 , generally range between
A. 250 to 500
B. 500 to 750
C. 750 to 1000
D. 1000 to 1250
Answer Option D
12. In a rapid sand filter, air binding is caused due to excessive
A. negative pressure
B. pressure
C. turbidity
D. water pressure
E. all the above.
Answer Option A
13. If average volume of sediment deposits is one-tenth million cubic metres per year in a reservoir of total capacity 10 million cubic metres, the dead storage will be filled up, in
A. 10 years
B. 15 years
C. 20 years
D. 25 years
E. 50 years.
Answer Option D
14. A circular gravity aqueduct is not generally preferred to because of
A. its maximum hydraulic mean depth
B. maximum area per unit of wetted perimeter
C. minimum cost of construction
D. its proper support on the ground.
Answer Option D
15. Standard unit of turbidity of water is in one litre of distilled water, one milligram of finely divided
A. silica
B. mud
C. clay
D. organic matter.
Answer Option A
16. Water losses in water supply, is assumed as
A. 5%
B. 7.5%
C. 10%
D. 22.5%
E. 15%.
Answer Option E
17. The pH value of water is kept slightly less than 7 so that hydrochloride ions may combine with ammonia ions to form
A. Mono-chloramine (NHCl)
B. Di-chloramine (NH2Cl)
C. Nitrogen trichloramine (NCl3)
D. All the above.
Answer Option D
18. 'Shrouding' is essentially provided in
A. strainer type wells
B. cavity type wells
C. slotted type well
D. all the above.
Answer Option C
19. The ensure proper growth of children's teeth, the quantity of flouride used in water mains, is
A. 1 mg/litre
B. 2 mg/litre
C. 3 mg/litre
D. 4 mg/litre
E. 5 mg/litre.
Answer Option A
20. Chemical coagulation of drinking water, is done
A. to settle suspended materials
B. to increase rate of settlement of suspended materials
C. to remove the bacterias
D. none of these.
Answer Option B
21. Permanent hardness of water can be removed by
A. adding alum
B. adding lime
C. adding chlorine
D. boiling
E. zeolite process.
Answer Option E
22. Demand for public uses in a city, does not include water required for
A. watering of public parks
B. watering of public gardens
C. sprickling on roads
D. drinking purposes.
Answer Option D
23. The chloride content of treated water for public supplies should not exceed
A. 100 ppm
B. 150 ppm
C. 200 ppm
D. 250 ppm
E. 300 ppm.
Answer Option D
24. An aquiclude is
A. a non artesian aquifer
B. an artesian acquifer
C. a confined bed of impervious material between acquifers
D. a large water body under ground.
Answer Option C
25. Pick up the incorrect statement from the following :
A. The net amount of water which joins the surface streams in a catchment, is known as surface run-off
B. The amount of water which joins the stream from the underground water, is called base flow
C. The yearly run off in cm depth over the catchment, is termed as the yield of the drainage basin
D. The yield of drainage in cm depth multiplied by the area of the catchment gives the annual volume of water
E. None of these.
Answer Option E
26. In an artesian acquifer, the draw downs in two observation wells at distances 100 m, and 200 m were found same after one hour and x hours respectively. The value of x, is
A. 2 hours
B. 4 hours
C. 9 hours
D. 16 hours.
Answer Option B
27. Dissolved carbon dioxide, can be removed from the supply main by
A. sedimentation
B. aeration
C. chlorination
D. coagulation
E. none of these.
Answer Option B
28. Slow sand filter is used if maximum turbidity of raw water is less than
A. 10 gm/litre
B. 20 gm/litre
C. 30 gm/litre
D. 40 gm/litre
E. 50 gm/litre.
Answer Option E
29. The external load per unit length of
A. a pipe laid on, or projecting above the undisturbed ground and covered with fills, is proportional to the square of the external diameter of the pipe
B. a flexible pipe burried in narrow trenches and thoroughly compacted side fills, is proportional to the product of the width of the trench and diameter of the pipe
C. a rigid pipe burried in a narrow trenches and thoroughly compacted side fills, is proportional to the square of the width of the trench
D. all the above.
Answer Option D
30. The total domestic consumption in a city water supply, is assumed
A. 20%
B. 30%
C. 40%
D. 60%.
Answer Option D
31. Alum is a
A. coagulant
B. flocculant
C. catalyst
D. disinfectant.
Answer Option A
32. If L, B and D length, breadth and depth of water in a rectangular sedimentation tank of total discharge Q, the settling velocity, is
A.
B.
C.
D.
E.
Answer Option D
33. In a reservoir the average volume of sediment deposition is 0.15 million cubic per year. If the dead storage and total capacity of the reservoir are 8 million cubic metres and 36 million cubic metres respectively,
A. the reservoir will theoretically be silted in 240 years
B. the reservoir will start reducing after 60 years
C. both (a) and (b)
D. neither (a) nor (b).
Answer Option C
34. Q is the discharge from an unconfined tube well with depression head S through a pipe of radius rw. If the radius of influence is R, the minimum required length of the strainer, is
A.
B.
C.
D.
Answer Option A
35. The requirement of water per capita per day, is
A. 90 litres
B. 150 litres
C. 250 litres
D. 400 litres.
Answer Option A
36. Pick up the incorrect statement from the following. In take of water supply should
A. be nearer to the treatment plant
B. receive water from purer zone of the source
C. be located downstream of waste water disposal point
D. remain easily accessible during floods.
Answer Option C
37. Reciprocating pumps
A. are not suitable for variable heads
B. are four times costlier than centrifugal pumps
C. are not suitable for pumping water containing sediments
D. single stroke produce pulsating flow
E. none of these.
Answer Option A
38. The temporary hardness of water can be removed by
A. boiling
B. adding lime
C. adding alum
D. filtration
E. sedimentation.
Answer Option A
39. Rapid gravity filters
A. were developed by G.W. Fullar
B. make use of coarser sand with effective size as 0.5 mm
C. yield as high as 30 times the yield of slow sand filters
D. are fed with coagulation treated water
E. all the above.
Answer Option E
40. If n is porosity, y is specific yield and r is specific retention of any soil, the relationship which holds good, is
A. n + y + r = 1
B. n + y = r
C. n + r = y
D. y + r = n
E. n + r + y = 0
Answer Option D
41. The coefficient of permeability of soils, is generally expressed in
A. cm/sec
B. cm/minute
C. cm2/sec
D. cm2/minute.
Answer Option A
42. Pick up the correct statement from the following :
A. Head loss in smaller size pipes at equal velocities, is less
B. Cost of pumping is less in smaller size pipes
C. Cost of smaller pipes is comparatively more
D. None of these.
Answer Option D
43. Total flow in stream is known
A. run off
B. stream flow
C. discharge
D. all the above.
Answer Option D
44. Disinfection of drinking water is done to remove
A. turbidity
B. odour
C. colour
D. bacterias
E. all the above.
Answer Option D
45. The ratio of total capacity and dead storage is kept
A. 8
B. 6
C. 4
D. 3
E. 2
Answer Option C
46. The U.C. (uniformity coefficient) for the best filter media sand should be
A. 2
B. 3
C. 4
D. 5
E. none of these.
Answer Option A
47. Pick up the correct statement from the following :
A. Deposition of calcium carbonate on the inside of the well pipe, causes incrustation of the pipe
B. Incrustation of the pipe reduces the discharge
C. Acidic waters cause corrosion of the pipes
D. Corrosion results due to excessive withdrawal of sand along with water
E. All the above.
Answer Option E
48. Specific yield of a well is
A. quantity of water than can be drawn from the well
B. flow of water per unit time
C. total quantity of water available in the well
D. quantity of water per unit time per unit draw-down.
Answer Option C
49. Normal values of overflow rate for plain sedimentation tanks in litres/hr/m2, generally range between
A. 100 to 250
B. 250 to 500
C. 500 to 750
D. 750 to 1000
Answer Option C
50. The formula for the head loss in conduits is generally known as
A. Hazen-William's formula
B. Manning's formula
C. Darcy-Weisbach formula
D. Nikuradse formula.
Answer Option B
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