Herewith below we have shared more than MCQs in Waste Water Engineering of our Civil Engineering subject. This will be very useful to study MCQs in systematic Manner.
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- Waste Water Engineering Practise MCQs 0%
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- Answered
- Review
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Question 1 of 320
1. Question
For a continuous flow type of sedimentation tanks
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Question 2 of 320
2. Question
The asbestos cement sewers are
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Question 3 of 320
3. Question
For efficient working of a sewer, it must be ensured that
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Question 4 of 320
4. Question
Pick up the correct statement from the following:
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Question 5 of 320
5. Question
Pick up the correct statement from the following:
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Question 6 of 320
6. Question
Bottom openings 15 cm x 15 cm in the standing baffle wall are provided
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Question 7 of 320
7. Question
The pressure exerted by
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Question 8 of 320
8. Question
For drainage pipes in buildings the test applied before putting them to use, is
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Question 9 of 320
9. Question
No treatment of the sewage is given if dilution factor is
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Question 10 of 320
10. Question
Which of the following pumps in used to pump sewage solids with liquid sewage without clogging the pump is?
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Question 11 of 320
11. Question
Acid regression stage of sludge digestion at a temperature 21°C extends over a period of
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Question 12 of 320
12. Question
Pick up the correct statement from the following:
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Question 13 of 320
13. Question
The coagulant which is generally not used for treating the sewage, is
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Question 14 of 320
14. Question
The layers of vegetable wastes and night soil alternatively piled above the ground to form a mound, is called
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Question 15 of 320
15. Question
If the flame of a miner’s safety lamp in the upper layers of the sewer forms an explosive, the sewer certainly contains
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Question 16 of 320
16. Question
The gas which may cause explosion in sewers, is
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Question 17 of 320
17. Question
Pick up the correct statement from the following:
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Question 18 of 320
18. Question
Pick up the incorrect statement from the following:
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Question 19 of 320
19. Question
The sewer pipes
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Question 20 of 320
20. Question
The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m per sec. The detention period recommended for the tank, is
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Question 21 of 320
21. Question
The Chezy’s constant C in the formula V = C Vrs depends upon
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Question 22 of 320
22. Question
The discharge per unit plan area of a sedimentation tank, is generally called
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Question 23 of 320
23. Question
Pick up the incorrect statement from the following for allowing workers to enter sewers
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Question 24 of 320
24. Question
For the open drain (N = 0.025) shown in the below figure, the discharge is
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Question 25 of 320
25. Question
To prevent settling down of sewage both at the bottom and on the sides of a large sewer, selfcleaning velocity recommended for Indian conditions, is
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Question 26 of 320
26. Question
Assertion (A): The determination of pH value of sewerage is important.
Reason (R): The efficiency of certain treatment methods depends upon the availability of pH value. -
Question 27 of 320
27. Question
The normal values of over flow rates for sedimentation tanks using coagulant, ranges between
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Question 28 of 320
28. Question
The drainage area of a town is 12 hectares. Its 40% area is hard pavement (K = 0.85), the 40% area is unpaved streets (K = 0.20) and the remaining is wooded areas (K = 0.15). Assuming the time of concentration for the areas as 30 minutes and using the formula Ps = 900/(t + 60) the maximum run off is
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Question 29 of 320
29. Question
Sewer pipes are designed for maximum discharge with 25% to 33% vacant cross-sectional area for
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Question 30 of 320
30. Question
The rational formula for peak drainage discharge, was evolved by
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Question 31 of 320
31. Question
The sewer that unloads the sewage at the point of treatment is called
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Question 32 of 320
32. Question
During preliminary treatment of a sewage
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Question 33 of 320
33. Question
For a grit chamber, if the recommended velocity of flow is 0.2 m/sec and detention period is 2 minutes, the length of the tank, is
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Question 34 of 320
34. Question
Dry weather flow is:
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Question 35 of 320
35. Question
Pick up the incorrect statement from the following:
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Question 36 of 320
36. Question
Pick up the correct statement from the following:
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Question 37 of 320
37. Question
If q is the average sewage flow from a city of population P, the maximum sewage flow
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Question 38 of 320
38. Question
3/4th or 1/4th extra space is left in sewer pipes at maximum discharge for
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Question 39 of 320
39. Question
If the flame of a miner’s safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains
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Question 40 of 320
40. Question
Hydraulic mean radius is
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Question 41 of 320
41. Question
If the depth of flow in a circular sewer is 1/4th of its diameter D, the wetted perimeter is
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Question 42 of 320
42. Question
Pick up the correct statement from the following:
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Question 43 of 320
43. Question
The Brake Horse power of the motor (efficiency 60%) required for a pump of capacity 0.075 cumec for a total lift of 12 m, is
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Question 44 of 320
44. Question
Aerobic bacterias
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Question 45 of 320
45. Question
At the junction of sewers
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Question 46 of 320
46. Question
Traps
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Question 47 of 320
47. Question
The sewage treatment units in which anaerobic decomposition of organic matter is used, are called
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Question 48 of 320
48. Question
Pick up the correct statement from the following:
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Question 49 of 320
49. Question
If the diameter of a sewer is 150 mm, the gradient required for generating self cleansing velocity, is
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Question 50 of 320
50. Question
The sewer which received discharge from two or more main sewers, is known as
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Question 51 of 320
51. Question
The grit and silt of the grit chambers, may not be used for
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Question 52 of 320
52. Question
For treating the sewage of a large city, you will recommend
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Question 53 of 320
53. Question
Imhoff cone is used to measure
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Question 54 of 320
54. Question
Pick up the correct statement from the following:
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Question 55 of 320
55. Question
1000 kg of sewage contains
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Question 56 of 320
56. Question
Dilution method of disposing of sewage, is not preferred to
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Question 57 of 320
57. Question
If the peak discharge of a storm water drain (S.W. Drain) is expected to exceed 150 cumecs, the free board to be provided, is
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Question 58 of 320
58. Question
The reduced levels of the string at the consecutive sight rails A and B are 203.575 m, 203.475 m respectively. If the difference of their R.D.s is 10 m, the gradient of the sewer line is
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Question 59 of 320
59. Question
R.M.O. expenses include
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Question 60 of 320
60. Question
For the COD test of sewage, organic matter is oxidised by K2Q2O7 in the presence of
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Question 61 of 320
61. Question
The sludge does not contain waste water from
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Question 62 of 320
62. Question
In sewers the velocity of flow should not be
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Question 63 of 320
63. Question
Pick up the correct statement from the following:
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Question 64 of 320
64. Question
In sewers the effect of scouring is more on
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Question 65 of 320
65. Question
The rainfall at any place may be determined by
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Question 66 of 320
66. Question
Pick up the correct statement from the following:
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Question 67 of 320
67. Question
Pick up the correct statement from the following:
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Question 68 of 320
68. Question
Sewer ventilating columns are generally placed at
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Question 69 of 320
69. Question
The sewer which resists sulphide corrosion, is
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Question 70 of 320
70. Question
In a sedimentation tank (length L, width B, depth D) the settling velocity of a particle for a discharge Q, is
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Question 71 of 320
71. Question
The formula which accepts the value of rugosity coefficient n = 0.012 to be used in Manning’s formula, is given by
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Question 72 of 320
72. Question
The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known
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Question 73 of 320
73. Question
Water content of sewage is about
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Question 74 of 320
74. Question
Skimming tanks are
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Question 75 of 320
75. Question
The most efficient cross-section of sewers in a combined sewerage system is
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Question 76 of 320
76. Question
The detention period for plain sedimentation water tanks, is usually
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Question 77 of 320
77. Question
The factor responsible for purification of sewage in river is
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Question 78 of 320
78. Question
Hume steel pipes are
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Question 79 of 320
79. Question
To maintain aerobic biological activity, the moisture content of the compost mass should be about
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Question 80 of 320
80. Question
Pick up the correct statement from the following:
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Question 81 of 320
81. Question
The pH value of sewage is determined with the help of
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Question 82 of 320
82. Question
If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is
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Question 83 of 320
83. Question
The normal value of over flow rates for plain primary sedimentation tanks, ranges between
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Question 84 of 320
84. Question
Pick up the incorrect statement from the following:
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Question 85 of 320
85. Question
Which one of the following statements regarding septic tanks is wrong?
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Question 86 of 320
86. Question
In a trickling filter
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Question 87 of 320
87. Question
In areas where rainy season is limited to a few months, the type of sewerage system recommended is
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Question 88 of 320
88. Question
The rate of accumulation of sludge in septic tanks is recommended as
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Question 89 of 320
89. Question
Dried sewage after treatment is used as
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Question 90 of 320
90. Question
For drains up to 15 cumecs, the depth ‘d and width ‘B’ are related by
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Question 91 of 320
91. Question
In areas where light rains are uniformly distributed throughout the year, the type of sewerage system to be adopted is
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Question 92 of 320
92. Question
Self-cleansing velocity is
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Question 93 of 320
93. Question
5 days-biochemical oxygen demand (BOD5) is taken at a temperature of
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Question 94 of 320
94. Question
Pick up the correct statement from the following:
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Question 95 of 320
95. Question
If a 2% solution of sewage sample is incubated for 5 days at 20°C and the dissolved oxygen depletion was found to be 8 mg/l. The BOD of the sewage is
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Question 96 of 320
96. Question
Pick up the in-correct statement from the following:
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Question 97 of 320
97. Question
A well oxidized sewage contains nitrogen mainly as
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Question 98 of 320
98. Question
The moisture content of sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is
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Question 99 of 320
99. Question
In a sludge tank, the gas mainly produced, is
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Question 100 of 320
100. Question
Bio-chemical oxygen demand (BOD) for the first 20 days in generally referred to
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Question 101 of 320
101. Question
Stoneware sewers are available in size
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Question 102 of 320
102. Question
If ‘D’ is the diameter of upper circular portion, the overall depth of New Egg shaped sewer section, is
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Question 103 of 320
103. Question
In normal conditions, the period for sludge digestion, is
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Question 104 of 320
104. Question
For evaporation and measurement of settable solids, the apparatus used, is
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Question 105 of 320
105. Question
In trickling filter, B.O.D. is reduced to
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Question 106 of 320
106. Question
For design of sewers, percentage of sewage discharge is assumed
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Question 107 of 320
107. Question
The grit chambers of sewage treatment plants, are generally cleaned after
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Question 108 of 320
108. Question
Maximum permissible velocity 1.5 m/sec, is adopted in drains
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Question 109 of 320
109. Question
The average temperature of sewage in India, is
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Question 110 of 320
110. Question
Cowl’ is provided at
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Question 111 of 320
111. Question
If the discharge of a sewer running half is 628 1.p.s., i = 0.001, and n = 0.010, the diameter of the sewer, is
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Question 112 of 320
112. Question
A drop manhole is provided if
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Question 113 of 320
113. Question
For a circular sewer of diameter ‘D’ running partially full with central angle ‘a’,
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Question 114 of 320
114. Question
The use of coarse screens for the disposal of sewage, may be dispensed with by
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Question 115 of 320
115. Question
In the activated sludge process
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Question 116 of 320
116. Question
For detecting the nitrates in sewage, the colour may be developed by adding
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Question 117 of 320
117. Question
The settling velocity of a spherical particle of diameter less than 0.1 mm as per Stock’s law, is
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Question 118 of 320
118. Question
In septic tanks,
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Question 119 of 320
119. Question
Inter-distance between ventilation columns in a sewer line is kept
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Question 120 of 320
120. Question
Stone ware pipes are
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Question 121 of 320
121. Question
The intensity of rain is expressed in
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Question 122 of 320
122. Question
The ratio of the diameter of a circular section and the side of a square section hydraulically equivalent, is
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Question 123 of 320
123. Question
Which one of the following part of human body withstands minimum radiation?
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Question 124 of 320
124. Question
Drop manholes are the manholes
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Question 125 of 320
125. Question
The bottom of the sewage inlet chamber of septic tanks, is provided an outward slope
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Question 126 of 320
126. Question
If 2% solution of a sewage sample is incubated for 5 days at 20°C and depletion of oxygen was found to be 5 ppm, B.O.D. of the sewage is
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Question 127 of 320
127. Question
Primary treatment of sewage consists of removal of
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Question 128 of 320
128. Question
The sewers
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Question 129 of 320
129. Question
Cement concrete sewers are only suitable if non-scouring velocity is between
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Question 130 of 320
130. Question
In a fully mechanised composting plant, involves
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Question 131 of 320
131. Question
The most widely used pump for lifting sewage is
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Question 132 of 320
132. Question
If’yW is the unit weight of water, V the hydraulic mean depth of the sewer and ‘S’ the bed slope of the sewer, then the tractive force exerted by flowing water, is
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Question 133 of 320
133. Question
Setting out the alignments of sewers may start from
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Question 134 of 320
134. Question
The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is
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Question 135 of 320
135. Question
Lead acetate test in sewer manhole is done to test the presence of
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Question 136 of 320
136. Question
Antisyphonage pipe is fitted
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Question 137 of 320
137. Question
In a grit chamber of a sewage treatment plant,
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Question 138 of 320
138. Question
The ratio of maximum sewage flow to average sewage flow for mains up to 1 m in diameter, is
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Question 139 of 320
139. Question
pH value of sludge during alkaline regression stage, is
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Question 140 of 320
140. Question
The arrangement made for passing the sewer line below an obstruction below the hydraulic gradient lines called
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Question 141 of 320
141. Question
Pick up the incorrect size of stone ware sewers
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Question 142 of 320
142. Question
Chlorination of water is done for the removal of
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Question 143 of 320
143. Question
Sludge banks are formed if sewage is disposed of in
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Question 144 of 320
144. Question
Assertion (A): A free board of 0.3 m is provided above the top sewage line in septic tanks. Reason (R): It helps to accommodate the scum in the septic tank.
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Question 145 of 320
145. Question
The temperature affects the
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Question 146 of 320
146. Question
The clarigesters are
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Question 147 of 320
147. Question
The density of population over 40 hectares is 250/hectare. If water supply demand per day is 200 litres and sewage discharge is 80% of water supply, the sewage flow in sewers of separate system, is
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Question 148 of 320
148. Question
In a residential colony, sewers of diameters 100 mm, 150 mm and 225 mm were laid with a gradient 1 in 120. Which portion of the sewage system does not choke in due course of time?
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Question 149 of 320
149. Question
The spacing of bars for perforations in coarse screens used for the treatment of sewage, is
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Question 150 of 320
150. Question
In case of Imhoff tanks,
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Question 151 of 320
151. Question
The pH value of fresh sewage is usually
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Question 152 of 320
152. Question
The maximum depth of sedimentation tanks, is kept
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Question 153 of 320
153. Question
If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21°C, B.O.D. of the sewage is
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Question 154 of 320
154. Question
Pick up the correct statement from the following:
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Question 155 of 320
155. Question
Lead caulked joints are used for laying
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Question 156 of 320
156. Question
If D is the diameter of a circular sewer and D’ is the top horizontal diameter of an equivalent egg shaped section, the relationship which holds good, is
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Question 157 of 320
157. Question
The spacing of man holes along a straight portion of a sewer is 300 m, the diameter of the sewer maybe
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Question 158 of 320
158. Question
A sewer running partially full and hurried with back filled, fails in compression due to
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Question 159 of 320
159. Question
A five day B.O.D. at 15°C of the sewage of a town is 100 kg/day. If the 5 day B.O.D. per head at 15°C for standard sewage is 0.1 kg/day, the population equivalent is
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Question 160 of 320
160. Question
Kjeldahl nitrogen is a mixture of
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Question 161 of 320
161. Question
The quantity of liquid waste which flows in sewers during the period of rainfall, is known
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Question 162 of 320
162. Question
Nitrogen cycle of sewage, is
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Question 163 of 320
163. Question
Depletion of ozone layer in the outer atmosphere may cause
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Question 164 of 320
164. Question
The minimum diameter of a sewer is kept
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Question 165 of 320
165. Question
A cylindrical ejector having its height 2 m fills after every 10 minutes with a peak sewage discharge of 0.0157 cumec. The diameter of the ejector chamber, is
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Question 166 of 320
166. Question
Pick up the correct statement from the following:
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Question 167 of 320
167. Question
Which one of the following gases is most significant as air pollutant?
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Question 168 of 320
168. Question
Hazen’s formula VS = 418 (GS – Gw)d [(3T + 70)/100] is used for the settlement velocity of the particles of diameter
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Question 169 of 320
169. Question
For sewers, inverted siphon is provided for
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Question 170 of 320
170. Question
Pick up the correct statement from the following:
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Question 171 of 320
171. Question
For large sewers, maximum distance between manholes may be
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Question 172 of 320
172. Question
In sewers designed with self cleansing velocity,
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Question 173 of 320
173. Question
The value of Chezy’s constant C = 157.6/(1.81 + K/√r) is used in