Environmental Engineering-I (Water Supply Engg.) - TE (CIVIL) Course material by PROF S S JAHAGIRDAR, NKOCET, SOLAPUR.

1. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
Environmental Engineering- I
Unit Wise Objective Question Bank
Unit-I
1.
Indicator/s used in alkalinity test is/are _______________________.
a) Phenolphthalein (PP)
b) Methyl orange (MO)
c) PP and MO
d) None of these
2. The permissible limit of MPN for drinking water per 100 ml is _____________.
a) 1
b) 10
c) 100
d) 1000
3. The indicator used in determination of chlorides is
a) EBT
b) Starch
c) Potassium chromate
d) MO
4. In DO test, titrant used is __________________.
a) Sodium Thiosulphate
b) Starch
c) Buffer solution
d) NaCl
5. The nature of end point in chloride test is ________________.
a) Yellow to brick red
b) White to yellow
c) Red to yellow
d) Blue to green
6. A condition that tends to increase corrosiveness of water on metals is _______.
a) High DO content
b) Low DO content
c) Polyphosphate
d) Low TDS
7. CO2 acidity is determined by using the indicator __________.
a) PP
b) MO
c) Starch
d) EBT
8. Design period of water works depends upon _____________.
a) Funds availability
b) Life of pipe material and other
structural materials
c) Rate of interest on loan taken to
d) All of above
complete the project
9. National board of fire under writers formula for estimating fire demand Q =4637 √P
(1+ 0.01P) where P indicates ________________.
a) Population
b) Population in thousands
c) Population in hundreds
d) Population in Lakh
10. _____________ formula gives number of simultaneous fire streams.
a) Buston’s
b) MUD
c) Kuichling’s
d) Freeman’s
11. In _____________ method population growth of a small town or area is related to big
towns or big areas.
a) Ratio and correlation
b) Graphical
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2. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
c) Zoning
d) Logistic
12. Generally ______________ supply will reduce rate of demand.
a) Continuous
b) Intermittent
c) Both a) and b)
d) None of these
13. Algae and protozoa impart _____________ to water.
a) Odour
b) Colour
c) Turbidity
d) All of above
14. _____________ causes scaling in boilers.
a) Hardness
b) Colour
c) Odour
d) Taste
15. Fluoride upto ______________ ppm will prevent dental caries of the children.
a) 1
b) 1.2
c) 1.5
d) 2.0
16. Phenols can impart ________________ to the water.
a) Colour
b) Turbidity
c) Objectionable taste
d) Hardness
17. As per IS-1172-1957, for cooking _______________ lit of water is required.
a) 50
b) 100
c) 1
d) 5
18. As per Boston’s formula Q is expressed in _____________
a) m3/sec
a) Lit/hr
b) Lit/min
c) lit
19. For calculating future population at the end of 30 years the value of ‘n’ in
arithmetic mean method is _____________
a) 5
b) 30
c) 0.3
d) 3
20. If total hardness of water is greater than its total alkalinity, then the carbonate
hardness will be equal to _______________________.
a) Total alkalinity
b) Total hardness
c) Total hardness – total alkalinity
d) Non carbonate hardness
21.
Column A
Column B
(Laboratory tests)
(Indicators)
i) Alkalinity
P) EBT
ii) D.O
Q) Starch
iii) Hardness
R) Potassium chromate
iv) Chlorides
S) MO and PP
a) i) – S ii) – Q iii) – R iv) – P
b ) i) – S ii) – Q iii) – P iv) – R
c ) i) – Q ii) – S iii) – P iv) – R
d ) i) – Q ii) – S iii) – R iv) – P
22. The unit of turbidity of water is __________________
a) JTU
b) NTU
d) All of above
c) PPM
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3. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
23. If degree of hardness is 3, then nature of water will be __________________
a) Extremely soft
b) Very soft
c) Soft water
d) Hard water
24. As per Is-1172-1957, per capita demand for domestic purpose is _________ lpcd.
a) 150
b) 135
c) 170
d) 130
25. The equation for Kuichling’s formula is given by __________________
a) Q = 3000 √P
b) Q = 3182 √P
c) Q = 3180 √P
d) Q = 3181√P
26. Purpose of water treatment is ___________________________________.
a) To remove odours
b) To remove taste
c) To kill pathogens
d) All of above
27. BIS limit for residual chlorine at users end is _____mg/lit.
a) 0.55
b) 0.5
c) 0.2
d) 1.0
28. If population of a town is 100 thousands, then by Buston’s formula, fire demand is
_______ Lit/min.
a) 31820
b) 3182
c) 5663
d) 56630
29. Procedure of adding 1 ml Manganous Sulphate and 1 ml Alkali Iodide Azide in 300
ml sample collected in BOD bottle is known as _____________________.
a) Aeration
b) De-aeration
c) DO Fixation
d) Solidification
30. _______ test is used for finding out optimum Alum dose.
a) Char
b) Ghar
c) Jar
d) None of these
31. In DO test, after DO fixation, white precipitate is obtained. Which means DO is
____________.
a) Absent
b) Present
c) Saturated
d) All of above
32. In DO test, after DO fixation, brown precipitate is obtained. Which means DO is
____________.
a) Absent
b) Present
c) Saturated
d) All of above
33. The most common cause of acidity in waters is ______________.
a) Carbon dioxide
b) Oxygen
c) Hydrogen
d) Nitrogen
34. Standard EDTA (Ethylene Diamine Tetra Acetic Acid) solution is used to
determine__________________.
a) Hardness in water
b) Turbidity in water
c) Dissolved oxygen in water
d) Residual chlorine in water
35. Which of the following practices cause reduction in the per capita consumption?
a) Good quality water
b) Hotter climate
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4. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
c) Modern living
d) Metering system
36. The suitable method for forecasting population for a young and a rapidly developing
city is ________________________.
a) Arithmetic mean method
b) Geometric mean method
c) Comparative graphical method
d) None of these
37. The suitable method for forecasting population for a old and developed large city is
________________________.
a) Arithmetic mean method
b) Geometric mean method
c) Comparative graphical method
d) None of these
38. The devices installed for drawing water from different water sources are called
_________________.
a) Filters
b) Intakes
c) Outlets
d) Inlets
39. Safe water is that water which does not contain ______________.
a) Pathogenic bacteria
b) Turbidity
c) Any taste
d) Any colour
40. The measure of the amount, to which light is absorbed or scattered by the suspended
material in water is called _______________.
a) Opacity
b) Turbidity
c) Clarity
d) Diffraction
41. Turbidity meters working on principle of scattering of light are known as
___________.
a) Spectrometers
b) Nephelometer
c) Tintometers
d) Optimeters
42. The colour imparted to water because of suspended solids is ________________.
43.
44.
45.
46.
47.
a) True colour
b) Apparent colour
c) colour
d) none of these
The colour imparted to water because of dissolved solids is ________________.
a) Apparent colour
b) True colour
c) Colour
d) Both b) and c)
pH value of water indicates _____________________.
a) Acidity
b) Alkalinity
c) Both a) and b)
d) None of these
Water having one unit lesser pH will be ___________________________.
a) 1 time more acidic
b) 10 times more acidic
c) 100 times more acidic
d) None of these
Temporary hardness of water is caused by___________________________.
a) Carbonates and bicarbonates of
b) Bicarbonates of Sodium and
Calcium and Magnesium
Potassium
c) Carbonates
of
Calcium
and
d) Dissolve CO2
Magnesium
When fluoride concentration in water exceeds 1.5 mg/lit or more the disease that may
be caused is ____________________________.
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5. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
48.
49.
50.
51.
52.
53.
54.
55.
56.
57.
58.
a) Methanemoglobinemia
b) Fluorosis
c) Dental carries in children
d) Poliomyelitis
Dental caries in children may be caused due to water supplies which are deficient in
____________.
a) Calcium
b) Iron
c) Fluorides
d) None ofthese
Blue baby disease may be caused in infants due to drinking waters containing higher
concentrations of _________________.
a) Nitrites
b) Nitrates
c) Lead
d) Arsenic
The maximum safe permissible limit of chlorides in domestic water supplies is
__________ mg/lit.
a) 0.5
b) 100
c) 200
d) 1000
The total amount of dissolved salts present in the water can be easily determined by
measuring _______________________________of water.
a) Specific conductivity
b) Electrical resistance
c) Solids test
d) All of above
Chlorides are generally present in the water in the form of __________.
a) KCl
b) NaCl
c) MgCl2
d) All of above
Micro-organisms capable of causing diseases are known as _________________.
a) aliens
b) pathogens
c) parasites
d) none of these
________________ types of indicator micro organisms are used to detect presence of
pathogenic bacteria.
a) E-coli
b) B-coli
c) C- coli
d) F-coli
If alkalinity of coloured sample is to be determined, then ______________ shall be
used during titration.
a) PP
b) MO
c) pH meter
d) both a) and b)
A city supply includes ______________________________.
a) Domestic water demand
b) Industrial and commercial
water demand
c) Fire demand
e) All of above
d) Water losses
The factor/s affecting per capita demand is/are __________________________.
a) Size of city
b) Climatic conditions
c) Pressure in the mains
e) All of above
d) Cost of water
___________________ treatment reduces salinity of water.
a) Flocculation
b) Reverse osmosis
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6. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
c) Electro-dialysis
d) Both b) and c)
59. Water having pH value 9, will have hydroxyl ion concentration, equal to _______.
a) 109
b) 10-9
5
c) 10
d) 10-5
60. Water with having pH value 9, will have hydrogen ion concentration equal to ___.
61.
62.
63.
60.
61.
62.
a) 9 mol/l
b) 10-9 mol/l
c) 109 mol/l
d) None of these
With increase in temperature specific conductivity of water _______________.
a) Increases
b) Decreases
c) Remains same
d) There is no such relation
Electrical conductivity and Total dissolved solids are interrelated. The values of EC
will ___________________________________________________________.
a) Decrease with increase in TDS
b) Increase with increase in TDS
c) Deceases initially and increases
d) All of above
afterwards
Column A
Column B
a. Absence of fluorides
i. Methemoglobinemia
b. Excess of lead
ii. Goitre
c. Presence of excess nitrates
iii. Dental caries
d. Absence of iodide
iv. Anemia
a
b
c
d
a) 3
4
2
1
b) 2
3
4
1
c) 3
4
1
2
d) 1
2
4
3
Column A
Column B
(Water Quality)
(Method of determination)
a. Hardness
i. Winkler method
b. Chlorine
ii. EDTA method
c. DO
iii. Orthotolidine test
d. Chloride
iv. Mohr method
a
b
c
d
a) 3
4
2
1
b) 2
3
1
4
c) 3
4
1
2
d) 1
2
4
3
The population of a town in three consecutive years are 5000, 7000 and 8400
respectively. The population of town in the fourth consecutive year according
to geometric increase method is ____________
a) 9500
b) 9800
c) 10100
d) 10920
The polluted water is one which
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7. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
a) contains pathogenic bacteria
b) consists of undesirable substances
rendering it unfit for drinking and
domestic use
d) is contaminated
c) is safe and suitable for drinking and
domestic use
63. The dissolved oxygen level in natural unpolluted waters, at normal temperature
is found to be of the order of_______
a) 1 mg/lit
b) 10 mg/lit
c) 100 mg/lit
d) 1000 mg/lit
64. The most common cause of acidity in water is_____________
a) carbon dioxide
b) oxygen
c) hydrogen
d) nitrogen
65. In a distribution system for population 2.5 lakhs the peak factor is considered
as _____________
a) 2
b) 2.5
c) 3
d) 4
66. Multiplying factor, as applied to obtain the maximum daily water demand, in relation
to the average, i.e. per capita daily demand is ______________
a) 1.5
b) 1.8
c) 3.0
d) 2.7
67. Design period for water supply projects is generally ______yrs.
a) Less than 10
b) 20-30
c) 50
d) More than 50
68. Find population at the end of 2011 by arithmetical increase method
Year
Population
1951
1,00,000
1961
1,09,000
1971
1,16,000
1981
1,28,000
a) 1,26,000
b) 1,36,000
c) 1,46,000
d) 1,56,000
69. The most common cause of acidity of water is _________________.
a) Oxygen
b) Hydrogen
c) Nitrogen
d) Carbon dioxide
70. Water is considered as hard if its hardness is in the order of _________mg/lit as
CaCO3
a) 50
b) 100
c) 150
d) Over 200
71. Dosage of alum is decided by ______________test.
a) Hardness
b) Chloride
c) Jar
d) Char
72. As per IS : 1172-1963, water required per head per day for average domestic
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8. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
purposes, is_____________
a) 50 litres
b) 135 litres.
c) 85 litres
d) 65 litres
73. Pick up the correct statement from the following :
a) Excess quantities of iron and
b) Lead and barium salts have toxic
manganese in water, cause
effect
discolouration of clothes
c) Arsenic and selenium are
e) All the above.
poisonous to human health
d) Higher copper content affects the
lungs
74. 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
d) all the above
alkaline
75. 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
76. The population growth curve is _______________
a) S-shaped curve
b) parabolic curve
c) circular curve
e) none of these
d) straight line
77. Turbidity of raw water is a measure of ______________________
a) suspended solids
b) acidity of water
c) B.O.D.
d) none of these
78. Water supply includes _______________________________________.
a) collection, transportation and
b) distribution of water to consumers
treatment of water
c) provision of hydrants for fire
e) all the above
fighting
d) mains, sub-mains and branch
lines of water supply
79. By boiling water, hardness can be removed if it is due to ______________
a) calcium sulphate
b) magnesium sulphate
c) calcium nitrate
e) none of these
d) calcium bicarbonate
80. The factor affecting per capita demand, is________________________
a) size of the city
b) climatic conditions
c) pressure in water mains
e) All the above.
d) cost of water
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9. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
81. Water supply includes _______________________________________.
f) collection, transportation and
g) distribution of water to consumers
treatment of water
h) provision of hydrants for fire
j) all the above
fighting
i) mains, sub-mains and branch
lines of water supply
82. 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
a)
c)
b)
d)
83.
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10. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
Unit-II
1.
For design of flocculator the value of G.t should be ___________.
2.
a) 104 to 105
b) 100 to 1000
d) All of above
c) 106 to 109
______________ law is valid for laminar flow.
a) Newton’s
b) Stoke’s
c) Reynolds’s
d) Camp’s
Cleaning interval for rapid sand filter bed is_____________.
3.
4.
5.
6.
7.
8.
9.
11.
12.
13.
a) 3 – 4 months
b) 6 – 8 months
c) 1 – 2 year
d) 24 hours
Immediately after addition of Alum, __________ mixing is necessary.
a) Gentle
b) Rapid
c) no
d) None of these
___________________ is done to check growth of weeds, algae and bacteria in raw
water.
a) Post chlorination
b) Double chlorination
c) Pre chlorination
d) De-chlorination
For flow of 5 mld with detention period of 6 hrs, _________m3 of volume will be
required for sedimentation tank.
a) 1250
b) 1255
c) 1245
d) 1200
The amount of chlorine consumed in the oxidation of impurities, before any
disinfection takes place is known as ____________________.
a) Chlorine dose
b) Residual chlorine
c) Chlorine demand
d) Free chlorine
Chemical formula of Bleaching powder is __________.
a) Ca(OCl)2
b) Ca(OCl)
c) Ca(OH)2
d) Ca2(OCl)
The film formed around media particle in slow sand filter is known as ________.
a) Dirty skin
b) Dirty thing
c) Pure film
d) skin
2
3
For flow of 15 mld with SOR 20 m /m /d, surface area of sedimentation tank
is____m2.
e) 750
f) 450
g) 650
h) 550
For ideal settling basin vs is settling velocity. If particle is having settling velocity
(vs’) more than that of vs, then particle will removed with _____ efficiency.
a) 100 %
b) Less than 100 %
c) 0 % (no removal)
d) None of these
In ___________ settling concentration of particles is less.
a) Type IV
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b) Type III
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11. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
c) Type II
d) Type I
Unit of weir loading is _________________.
a) Lit/m2/d
b) Lit/m2/sec2
c) Lit/m/d
d) Lit/d
__________________ are compounds of ammonia and chlorine.
a) Ozone
b) CFC
c) Chloramines
d) All of above
Period of cleaning interval for slow sand filter is ________.
a) 1 to 2 months
b) 1 to 2 yrs
c) 1 to 2 days
d) 1 to 2 hrs
-1
Sec is unit of __________.
a) Velocity gradient
b) Detention period
c) Power input
d) Area of paddle
The method of cleaning rapid sand filter is__________________.
a) Scraping top layer
b) Replacement of sand
c) Backwashing
d) All the above
If the sedimentation tank is rectangular in shape having length L, width W
and depth D, then for discharge (Q), the settling velocity of particle would
be ________________.
a) Q/ (W x D)
b) Q / (L x W)
c) Q / (D x L)
d) Q / (L x W x D)
Molecular formula for bleaching powder is ___________.
a) ClO2
b) CaCl2
c) Ca(OH)2
d) Ca(OCl)2
Aeration of water is employed to remove __________ in form of precipitate.
a) Iron
b) Hardness
d) Oxygen
c) Alkalinity
The disinfection by chlorination is most efficient at pH _________
a) 2.0
b) 5.0
c) 10.0
d) 7.0
Activated carbon can be used in water treatment for removing ___________
a) Colour
b) Tastes and odours
c) Turbidity
d) All of above
For slow sand filters period of cleaning is ______________
a) 1 to 2 days
b) 1 to 2 years
c) 1 to 2 months
d) No cleaning is required
__________________ is not a coagulant.
a) Alum
b) Chlorinated coppers
c) Lime
d) Sodium Aluminate
_____________ sedimentation is concerned with the settling/removal of non
flocculating, discrete particles from the water.
a) Type – I
b) Type – II
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12. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
39.
c) Type – III
d) Type – IV
_____________ type of filter requires large area.
a) Slow sand
b) Rapid sand
c) Vaccume
d) None of these
_____________ means removal of excess chlorine from water.
a) Pre-chlorination
b) Post chlorination
c) De-chlorination
d) Break point chlorination
_____________ does not cause permanent hardness.
a) Calcium sulphate
b) Calcium bicarbonate
c) Magnesium sulphate
d) Calcium chloride
Aerator removes __________________
a) Silt
b) Taste and odour
c) Sand
d) Flocs
In case of flocculator ‘G’ means __________________
a) Power dissipated
b) Specific gravity
c) Velocity gradient
d) Viscosity
In rapid sand filters the permissible head loss is __________________
a) Between 2.5 and 3.5 m
b) Exactly 2.5 m
c) Less than 5 m
d) All of above
Period of clearing for slow sand filter is __________________
a) 15 days
b) 2 to 3 days
c) 6 months
d) 1 to 2 months
Stokes law is applicable for Reynolds number when Re __________________
a) More than 5
b) Greater than one
c) Equal to ten
d) Less than one
Temporary hardness can be removed by __________________
a) Aeration
b) Boiling
c) Co-agulation
d) Freezing
Air diffusion is a type of ____________ system.
a) Chlorination
b) Flocculation
c) Aeration
d) Sedimentation
Settling tank efficiency is reduced by ___________.
a) Eddy currents
b) Surface currents
c) Vertical convection
d) All of above
3
For a rectangular tank L x B x H is 5 x 4 x 3 m and design discharge is 600 m3/d.
Hence, SOR will be ______________.
a) 40 m3/m2/d
b) 50 m3/m2/d
c) 30 m3/m2/d
d) 20 m3/m2/d
In case of rapid sand filters ___________ formula is used for estimation of sand
depth.
a) Hudson
b) Chezy’s
c) Manning’s
d) Hardy’s
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13. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
40.
41.
42.
43.
44.
45.
46.
47.
48.
49.
50.
51.
52.
The requirement of residual chlorine ________________ with decrease in
temperature and increase in pH.
a) Does not changes
b) Decreases
c) Both a) and b)
d) increases
Zeolites can be regenerated by passing a solution of ___________.
a) Sugar
b) Salt
c) Wine
d) All of above
The process in which chlorination is done beyond break point is______________.
a) Pre chlorination
b) Super chlorination
c) Post chlorination
d) Break point chlorination
The effective size of sand particles used in slow sand filter is __________ mm.
a) 0.20 to 0.35
b) 0.35 to 0.6
c) 0.6 to 1
d) 1 to 1.80
If in a sedimentation tank, volume of tank is 20 m x 10 m x 3 m and flow rate is
3600m3/d, then detention time will be ____________hr
a) 4
b) 6
c) 3
d) 2
The efficiency of sediments removal in sedimentation tank does not depends upon
___________________.
a) Discharge through the tank
b) Width of the tank
c) Length of the tank
d) Depth of the tank
The most widely used coagulant in water treatment is ____________________.
a) Lime soda
b) Alum
c) Ferrous sulphate
d) Chlorinated copperas
A clariflocculator is a ___________________________.
a) Plain sedimentation unit
b) Aeration unit
c) Coagulation –sedimentation unit
d) None of the above
Cleaning of slow sand filter is done by ______________.
a) Scrapping and removal of sand
b) Back washing
c) Any of above
d) None of above
Cleaning of rapid sand filter is done by ______________.
a) Scrapping and removal of sand
b) Back washing
c) Any of above
d) None of above
Disinfection of water helps in _____________________________.
a) Removing turbidity
b) Removing hardness
d) Complete sterilization
c) Killing pathogenic bacteria
Chlorine demand of water is equal to __________________________.
a) Applied chlorine
b) Residual chlorine
c) a) –b)
d) a) + b)
Which of the following compound can be used for chlorination of water?
a) Carbon dioxide
b) Bleaching powder
c) Alum
d) All of above
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14. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
53.
54.
55.
56.
57.
58.
59.
60.
61.
62.
63.
64.
65.
The process of desalination of water, which makes use of micro-porous membrane,
is _______________________.
a) Electrodialysis
b) Solar distillation
c) Freezing
d) None of above
________________ as a disinfectant leaves behind residuals.
a) UV light
b) Lime
c) Chlorine
d) All of above
________________ as a disinfectant does not leaves behind residuals.
e) UV light
f) Chlorine dioxide
g) Chlorine
h) Bleaching powder
The process of passing the water through beds of granular materials is called
_______________.
a) Screening
b) Sedimentation
c) Filtration
d) Disinfection
Chlorination ofwater does not remove __________________________________.
a) Ammonia content
b) BOD
c) Organic matter content
d) DO
The ratio of discharge and plan area in continuous flow type sedimentation tank is
known as _________________________.
a) Surface overflow rate
b) Weir loading
c) Volumetric loading rate
d) All of above
Wash water troughs are provided in ______________________.
a) Rapid sand filter
b) Flocculator
c) Aerator
d) Sedimentation tank
In rapid sand filter air binding is caused due to ________________.
a) Negative pressure
b) Pressure
c) Turbidity
d) All of above
Raw water treated only by chlorine is known as _________________.
a) De-chlorination
b) Pre-chlorination
c) Super-chlorination
d) All of above
To control growth of algae in reservoirs following chemical is used ___________.
a) Bleaching powder
b) Copper sulphate
c) HCl
d) None of these
Type II settling in water treatment is defined a ______________________________.
a) Settling of discrete particles in
b) Settling of flocculent particles
dilute suspensions
in dilute suspensions
c) Settling of flocculent particles in
d) Settling of particles in sludge
concentrated suspensions
blanket
Air binding phenomena in rapid sand filter may occur due to ______________.
a) Excessive negative pressure
b) Mud ball formation
c) Higher turbidity in the effluent
d) Low temperature
At lower pH values of water, the contact period required for chlorination is _______.
a) Lower
b) Higher
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15. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
66.
67.
68.
69.
67.
c) Same
d) None of above
Disinfection efficiency of chlorine treatment______________________________.
a) Is decreased at higher pH values of
b) Is increased at higher pH
water
values of water
c) Is unaffected at higher pH values of
d) Is highest at pH 7
water
A river is the source of water for water supply scheme to a town. Its water is very
turbid and polluted. The correct sequence of steps for treating the river water would
be ______________________________________________________________.
a) Presedimentation

b) coagulation sedimentation 
prechlorination
coagulation
post chlorination
sedimentation filtration 
post chlorination
c) sedimentation  post chlorination
d) coagulation
sedimentation
filtration  post chlorination
The various treatment processes are listed below
1. Filtration 2. Chlorination 3. Sedimentation 4. Coagulation 5. Flocculation
The correct sequence of these processes in water treatment is
_______________________.
a) 1,2,3,4,5
b) 4,5,3,1,2
c) 2,3,1,5,4
d) 1,2,5,4,3
Column A
Column B
a. Aerator
i. excess CO2 and H2S removal
b. rapid sand filter
ii. Settleable and colloidal matter
c. slow sand filter
iii. Suspended matter
d. sedimentation tank
iv. Suspended colloidal and
bacteriological matter
a
b
c
d
a) 3
4
2
1
b) 2
3
4
1
c) 3
4
1
2
d) 1
3
4
2
Column A
Column B
a. Air binding
i. Changes effective size of
b. Mud deposition
sand
c. Cracking of bed
ii. Mud penetrates deeper inside
d. Sand incrustation
the bed
iii. Mounds and balls of mud
are formed in the bed
iv. air and gases get locked in
the bed
a
b
c
d
a) 4
3
2
1
b) 2
3
4
1
c) 3
4
1
2
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16. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
d)
68.
69.
1
3
4
2
The purpose of aeration used in water treatment is ___________
a) To reduce corrosion to water pipes
b) To remove iron and manganese
c) remove hydrogen sulphide
d) All the above
Coagulation is generally adopted, when turbidity of water is greater than ____________
mg/L.
a) 50
c) 40
b) 60
d) 100
70.
Strokes law is applied in design of ____________ treatment unit.
a) Coagulation
b) Filtration
c) Sedimentation
d) Aeration
71.
In sedimentation process Type – I sedimentation is also called as ________
a) Discrete settling
b) Hindered settling
c) Zone settling
d) Compression settling
Rate of filtration for slow sand filter is _____ lit/hr/m2
a) 100-200
b) 500-1000
c) 3000-6000
d) All of above
The effective size of sand particles used in slow filter is ___________.
a) 0.25 to 0.35 mm
b) 0.35 mm to 0.60 mm
c) 0.60 to 1 mm
d) 1.00 to 1.80 mm
The settling velocity of inorganic particles is less than 0.1 mm dia. varies with the
dia. (d), in proportion ____________.
a) d3
b) d2
c) d
d) None of above
Surface loading or overflow rate of sedimentation tank, passing a discharge Q, and
having length = L, depth= D and width = B is given by_________.
a) Q/BD
b) Q/BL
c) QBD
d) Q/BDL
Cleaning of slow sand filter is done by ________________.
a) Scrapping and removal of sand
b) Back washing
c) Any of above
d) None ofthese
Odour and taste is controlled by __________
a) Aeration
b) Coagulation
c) Disinfection
d) Softening process
Pick up the correct statement from the following :________________________
a) Detention
period
for
plain
b) Detention
period
for
sedimentation tanks ranges between
sedimentation tanks, using
4 to 8 hours
coagulants usually ranges
between 2 to 4 hours
c) The horizontally flow velocity in
d) All the above.
sedimentation tanks, is generally
limited to 0.3 m/minute
72.
73.
74.
75.
76.
77.
78.
79.
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17. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
a)
c)
TE (CIVIL) Div- A and B
b)
d)
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18. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
Unit-III
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
The value of ‘a’ in the equation to find economic diameter D = a√ Q is
a) 1
b) 1.5
c) 2
d) 2.5
NP-1 is a class of ______________ type of pipe
a) C.I.
b) Cement concrete
c) Steel
d) none of these
Spacing of bars in thrust block is restricted to _____________ mm C/C.
a) 400
b) 500
c) 700
d) 1000
Minimum residual pressure at ferrule points for two storey building is
_________ m.
a) 7
b) 10
c) 12
d) 17
Thrust block is designed for a minimum factor of safety of_________.
a) 0.5
b) 1
c) 2
d) 4
______________ pipes are free from corrosion.
a) Steel
b) C.I.
c) Wrought Iron
d) PVC
_____________ is constituent of Asbestos cement pipe.
a) Sand
b) Lime
c) Portland cement
d) Iron
Modulus of elasticity for CI pipe is _____________ Kg/m2
a) 7.5×109
b) 7.5×106
c) 7.5×1010
d) 7.5×105
2
_____________ Kg/cm pressure is required in distribution system for buildings
above 10 storeys.
a) 5.5
b) 7
c) 8
d) 5.5. to 7
Minimum residual pressure for three storey building is _____________
a) 7 m
b) 12 m
c) 17 m
d) 25 m
Economic diameter of pumping main is given by __________________
a) D = a √Q
b) D = aQ2
2/3
d) D = aQ
c) D = aQ
Cast iron pipes are cast in generally __________________ meters.
a) 10 to 15
b) 20 to 25
c) 3 to 6
d) 100 to 200
Minimum residual pressure required for single storey building is_______.
a) 12 m
b) 15 m
c) 7 m
d) 10 m
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19. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
Minimum size of pipe for a town with population above 50,000 is
__________________ diameter.
a) 150 mm
b) 100 mm
c) 250 mm
d) 500 mm
Velocity of sound in water is ____________m/sec.
a) 1433
b) 1432
c) 1431
d) 1436
Corrosion is ____________________________ process.
a) Electromagnetic
b) Electrostatic
c) Electrodynamic
d) Electrochemical
_____________________ types of pipes are free from corrosion.
a) Plastic
b) Steel
c) CI
d) None of these
Pressure pipes are exclusively used for carrying water supplies because
_______________________________________________________________.
a) Such pipes are closed and hence
b) Since water runs under high
not
exposed
to
pollution
pressure in these pipes,
anywhere.
pollutants from outside cannot
get entry, even if some joints
are loose
c) Such pipes can go up and down
d) All of above
the hills and valleys, thus requiring
lesser depth for laying the pipes
Hoop stress in the water pipe is caused by __________________________.
a) Internal water pressure
b) Water hammer pressure
c) Traffic load
d) All of above
Water hammer pressure can be reduced by ___________________________.
a) Rapid closing of valve
b) Slow closing of valve
c) Closing the valves in critical time
d) None of these
Modulus of elasticity of steel pipe is __________kg/m2.
a) 2.1 x 1010
b) 2.1 x 1011
11
15
c) 2.1 x 10
d) 2.1 x 10
The water hammer pressure developed in a pipe will be __________________, if
time of closure of valve is greater than critical time Tc.
a) Lesser than ph max
b) Greater than ph max
c) Equal to ph max
d) None of these
The water hammer pressure developed in a pipe will be _________________, if
time of closure of valve is lesser than critical time Tc.
a) Lesser than ph max
b) Greater than ph max
c) Equal to ph max
d) None of these
The water hammer pressure developed in a pipe will be _________________, if
time of closure of valve is equal to critical time Tc.
a) Lesser than ph max
b) Greater than ph max
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Page 19

20. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
c) Equal to ph max
d) None of these
To compensate water hammer pressure ______________________ are provided.
a) Surge tank
b) Sedimentation tanks
c) Merge tanks
d) Intz tank
Anchorages in the pipe network are provided _________________________.
a) At all bends
b) At other points of unbalanced
pressure
d) All of above
c) At all steep slopes
LA class of pipe will be found in ___________ pipes.
a) Steel
b) Copper
c) Cast iron
d) PVC
DI-K14 pipes are available in the form of ____________
a) socket
b) spigot
c) screwed
d) welded flange
Graphite is most noble comparing to _____________
a) gold
b) platinum
c) copper
d) both a) and b)
Minimum surface reinforcement required in the thrust block is ______ kg/m2.
a) 2
b) 3
c) 5
d) 9
For a discharge of 4 m3/s the economic diameter of pumping main will
be__________ mm.
a) 1000
b) 2000
c) 4000
d) 5000
The minimum residual pressure for single storey building is __________
a) 5 m
b) 7 m
c) 10 m
d) 15 m
Modulus of elasticity of CI pipe is _________kg/m2.
a) 7.5 x 109
b) 7.5 x 106
c) 7.5 x 108
d) 7.5 x 105
The value of coefficient of expansion (α)for conduits per 0C may be taken as
______________ for steel.
a) 11.5 x 10-6
b) 7.5 x 10-6
c) 10 x 10-6
d) None of above
The corrosion in pipe is due to ________________.
a) DO in water
b) pH of water
c) Impurities
in
the
material
d) All of above
particularly those having a lower
potential
Corrosion of a pipe _____________________________________
a) reduces its life span
b) reduces its carrying capacity
c) adds colour to water
e) all the above
d) adds odour to water
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21. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
37.
Asbestos pipes are ___________________________________________________
a) light in weight and easy to
b) highly resistant to corrosion
transport
c) high flexible to accommodate
e) all the above
deflection upto 12°
d) very
much
smooth
and
hydraulically efficient
38.
a)
c)
TE (CIVIL) Div- A and B
b)
d)
Page 21

22. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
Unit-IV
1.
9.
In pressure supply mains, water hammer pressure is reduced
providing__________________.
a) sluice valve
b) air valve
c) pressure relief values
d) none of these
In equation of hf = K.Gn the value of ‘n’ for Hazen William’s formula is____.
a) 1.85
b) 1.81
c) 1.7
d) 1.0
Washout valves are provided at ___________ points in the mains.
a) Highest
b) Lowest
c) Summit
d) All the above
Reflux valve is also known as _______________ valve.
a) gate
b) Check
c) scour
d) sluice
Loss of head is minimum in ___________ system.
a) dead end
b) recticulation
c) circular
d) radial
The value of coefficient of friction (f) for laminar flow is _____________
a) 64 × Re
b) Re/64
b) Re
c) 64
The value of Manning’s ‘n’ for brass and glass pipe is ___________
a) 0.009 to 0.013
b) 0.010 to 0.012
c) 0.011 to 0.014
d) 0.016 to 0.020
Check valve is also known as ______________
a) Reflux valve
b) Non-return valve
c) Both a) and b)
d) None of these
Summits are the points of ____________ pressure.
10.
a) High
c) Equal
Match the pairs
2.
3.
4.
5.
6.
7.
8.
Column A
i. Gate valve
ii. Air relief valve
iii. Reflux valve
iv. Safety valves
11.
i – Q, ii – R, iii – S, iv – P b
i – Q, ii – R, iii – P, iv – S
Match the pairs
Column A
i. Check valve
TE (CIVIL) Div- A and B
by
b) Low
d) None of these
Column B
P) located at high pressure points
Q) Used to shut off the supplies
R) To provide exit for accumulated
air
S) Allows water to flow in one
direction
i – R, ii – Q, iii – P, iv – S
i – Q, ii – P, iii – R, iv – S
Column B
P) To remove silt in pipe line
Page 22

23. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
ii. Sluice valve
iii. Air valve
iv. Scour valves
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
Q) To check water flow in one
direction
R) To control flow of water
through pipe line
S) To release accumulated air
i – Q, ii – R, iii – S, iv – P
i – R, ii – Q, iii – P, iv – S
i – Q, ii – R, iii – P, iv – S
i – Q, ii – P, iii – R, iv – S
Storage capacity of distribution reservoir is determined by _____________
a) Hydrograph method
b) Mass curve method
c) Log curve method
d) Both (a) and (b)
In case of minor losses value of ‘K’ for 90° elbow is _____________
a) 0.5
b) 1.0
c) 0.5 to 1.0
d) 0.05
Air relief valves are provided at the __________________ along water pipe.
a) Summits
b) Sag
c) Mid-point
d) None of the above
Reflux valves are also known as __________________ valves.
a) Sluice
b) Check
c) Non-return
d) Both b and c
In Hazen William’s formula, the coefficient C depends upon
__________________.
a) Pipe material
b) Age of pipe
c) Diameter of pipe
d) All of above
The value of Manning’s ‘n’ for concrete pipe with rough joints is
__________________.
a) 0.016 to 0.017
b) 0.009 to 0.013
c) 0.010 to 0.012
d) 0.50 to 1.5
For well planned cities __________________ type of distribution system is used.
a) Dead end
b) Grid-iron
c) Circular
d) Radial
Stagnation of water occurs in __________________ system.
a) Radial
b) Grid iron
c) Circular
d) Dead end
Reflux valves are also known as ______________ valves.
a) Shut off
b) Check
c) Cut off
d) Air relief
To obtain value of friction factor ______________ charts are commonly used.
a) Manning’s
b) Moody’s
c) Noody’s
d) Chezy’s
The value of k in equation hm = k x (V2/2g) for entrance is _____________.
a) 0.6
b) 0.4
c) 0.5
d) 0.7
Radial system is reverse of ___________ system.
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Page 23

24. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
a) Dead end
c) Circular
23.
24.
25.
26.
27.
28.
29.
30.
b) Grid Iron
d) All of above
The valve which allows flow in one direction is ___________________.
a) Reflux
b) Sluice
c) Gate valve
d) None of these
A blow off valve is provided in water distribution system at ________________.
a) Low points
b) High points
c) Junction points
d) All of above
Pressure relief valves installed along water mains are provided for relieving
____________________.
a) Air pressure
b) Water hammer pressure
c) Ice pressure
d) All of above
The suitable layout for a water supply distribution system for irregularly grown city
is _________________________.
a) Dead end system
b) Grid iron system
c) Ring system
d) Radial system
The suitable layout for a water supply distribution system for well planned city
with rectangular road pattern is ___________________
a) Dead end system
b) Grid iron system
c) Ring system
d) Radial system
In Hardy-Cross method more the number of iterations (trials), ___________ is the
correction in discharge (ΔQ).
a) More
b) Constant
c) Multiple
d) Lesser and accurate
______________________________ method/methods is/are used for analysis of
pipe network.
a) Hardy cross
b) Newton-Raphson
c) Linear Theory
d) All of above
Match the pairs
Column A
i. Dead end system
ii. Grid iron system
iii. Ring system
iv. Radial system
31.
Column B
P) Equal pressures and multiple
flow paths
Q) Both economy and reasonably
equal pressures
R) Economy and simplicity
S) zonal distribution
i – Q, ii – R, iii – S, iv – P b
. i – R, ii – P, iii – Q, iv – S
i – Q, ii – R, iii – P, iv – S
i – Q, ii – P, iii – R, iv – S
In a pipe network ABCD (including common pipe AC) of 5 pipes, which of the
following statement is true?
a) Correction is applied twice (Two
b) Only one Correction is applied
times) to pipe AC
to pipe AC
c) No correction is applied to pipe
d) Correction is neglected for pipe
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25. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
32.
33.
34.
35.
36.
37.
38.
39.
40.
41.
AC
AC
Reflux valve is also known as ____________ valve.
a) gate
b) check
c) scour
d) sluice
Intermittent system of supply will require large no. of valves. This statement
is _____________
a) True
b) False
c) Can’t say
d) Hypothetical
Loss of head is minimum in _____________ system.
a) dead end
b) reticulation
c) circular
d) radial
Pumping system is best suited when ____________________________
a) Fire accidents occurs frequently
b) Source of water is at low level
c) Density of population is high and
d) Power failure are more
space available is less
common
An Advantage of intermittent system of supply is ______________________.
a) It is economical
b) Supply is assured during fire
accidents
c) Pumping is for limited period
d) Repairs can be carried out
during non supply hours
Distribution system in which, mains, submains and branches are connected with
each other is ___________________.
a) Tree system
b) Grid iron system
c) Radial system
d) None
The valve used for controlling the flow is ______________.
a) Sluice valve
b) Check valve
c) Scour valve
d) Pressure relief valve
Scour valve in a water distribution system is provided at _____________.
a) Low points
b) High points
c) Junction points
d) All of above
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
In distribution pipes, drain valves are provided at _______________
a) lower point
b) higher point
c) junction points
d) any where.
42.
e)
g)
f)
h)
a)
c)
b)
d)
43.
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26. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
Unit-V
1.
2.
3.
4.
5.
For determining storage capacity of reservoirs ______________ equation is used.
a) McDonald
b) McDermott
c) McMillan
d) None of these
To absorb the hourly variation in demand ______________ type of reservoirs are
provided.
a) Sedimentation
b) Filtration
c) Penetration
d) Distribution
Total Capacity of distribution reservoir is _______________________________.
a) Balancing reserve
b) Fire reserve
c) Break down reserve
d) Sum of a), b) and c)
In McDonalds formula, coefficients a and b are ____ and _____ respectively
a) 0.2, 0.1
b) 0.2, 0.3
c) 0.4, 0.5
d) 0.1, 0.4
In hydrograph method, balancing capacity of the reservoir is ___________.
a) Area above or below average
b) Maximum ordinate
pumping line
c) Sum of maximum ordinate
d) All of above
6.
Cumulative
supply and
demand
Demand
Curve
A
Supply
line
B
7.
8.
9.
Time in hrs 
In above graph, balancing capacity of reservoir is given by___________________.
a) A+B
b) A-B
c) B-A
d) Max of A or B
In hydrograph method, capacity of reservoir can be calculated by _____________
formula.
a) Trapezoidal
b) Simpson’s
c) Both a) and b)
d) None of these
One of the following type of method may give error while determining balancing
capacity.
a) Analytical
b) Graphical
c) Both a) and b)
d) None of these
While determining balancing capacity of distribution reservoir, in graphical method
____________________________________________is plotted on Y-axis.
a) Cumulative demand
b) Cumulative supply or pumping
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27. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
10.
11.
c) Cumulative losses
d) Both a) and b)
While determining balancing capacity of distribution reservoir, in graphical method
______is plotted on X-axis.
a) Discharge in lit
b) Time in hrs
c) Time in days
d) Time in months
The storage capacity of reservoir can be found out by ______________
a) Heytograph
c) Mass curve
b) Flow frequency curve
d) All of above
a)
c)
b)
d)
12.
TE (CIVIL) Div- A and B
Page 27