Herewith below we have shared more than MCQs in Environmental Engineering of our Civil Engineering subject. This will be very useful to study MCQs in systematic Manner.
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- Answered
- Review
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Question 1 of 148
1. Question
The polluted water is one which
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Question 2 of 148
2. Question
Orthotolidine test is used for determination of
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Question 3 of 148
3. Question
The chemical most commonly used to increase speed of sedimentation of sewage is
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Question 4 of 148
4. Question
The disinfection efficiency of chlorine increases by
(i) Decreasing the time of contact
(ii) Decreasing the temperature of water
(iii) Increasing the temperature of water The correct answer is -
Question 5 of 148
5. Question
The layout of distribution system in which water flows towards the outer periphery is
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Question 6 of 148
6. Question
The type of valve which allows water to flow in one direction but prevents its flow in the reverse direction is
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Question 7 of 148
7. Question
The suitable system of sanitation for area of distributed rainfall throughout the year with less intensity is
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Question 8 of 148
8. Question
The main disadvantage of cement concrete sewers is
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Question 9 of 148
9. Question
Settling velocity increases with
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Question 10 of 148
10. Question
Facultative bacteria are able to work in
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Question 11 of 148
11. Question
The suitable layout of distribution system for a city with roads of rectangular pattern is
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Question 12 of 148
12. Question
The slope of sewer shall be
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Question 13 of 148
13. Question
The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by
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Question 14 of 148
14. Question
The working conditions in imhoff tanks are
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Question 15 of 148
15. Question
The pipe which is used to carry the discharge from sanitary fittings like bath rooms, kitchens etc. is called
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Question 16 of 148
16. Question
If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to
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Question 17 of 148
17. Question
For a given discharge, the efficiency of sedimentation tank can be increased by
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Question 18 of 148
18. Question
Air binding phenomena in rapid sand filters occur due to
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Question 19 of 148
19. Question
The suitable method for disinfection of swimming pool water is
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Question 20 of 148
20. Question
The commonly used material for water supply pipes, which has the properties of being strong, not easily corroded and long life but is heavy and brittle, is
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Question 21 of 148
21. Question
The water carriage system of collection of waste product
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Question 22 of 148
22. Question
The effect of increasing diameter of sewer on the self cleansing velocity is
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Question 23 of 148
23. Question
The rate of BOD exerted at any time is
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Question 24 of 148
24. Question
Generally the detention period for grit chambers is kept as
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Question 25 of 148
25. Question
Sludge volume index is defined as the ratio of
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Question 26 of 148
26. Question
The biochemical treatment of sewage effluents is essentially a process of
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Question 27 of 148
27. Question
Which of the following causes a decrease in per capita consumption?
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Question 28 of 148
28. Question
The suitable method of forecasting population for a young and rapidly increasing city is
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Question 29 of 148
29. Question
Which of the following is not a water borne disease?
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Question 30 of 148
30. Question
Standard EDTA (ethylene diamine tetra acetic acid) solution is used to determine the
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Question 31 of 148
31. Question
The settling velocity of a particle in a sedimentation tank depends on
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Question 32 of 148
32. Question
The detention period in coagulation tanks is usually kept as
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Question 33 of 148
33. Question
Period of cleaning of slow sand filters is about
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Question 34 of 148
34. Question
The process in which the chlorination is done beyond the break point is known as
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Question 35 of 148
35. Question
Disinfection efficiency is
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Question 36 of 148
36. Question
The suitable layout of a distribution system for irregularly growing town is
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Question 37 of 148
37. Question
A sewer that receives the discharge of a number of house sewers is called
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Question 38 of 148
38. Question
The time of concentration is defined as
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Question 39 of 148
39. Question
Most suitable section of sewer in separate sewage system is
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Question 40 of 148
40. Question
The pathogens can be killed by
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Question 41 of 148
41. Question
The minimum dissolved oxygen which should always be present in water in order to save the aquatic life is
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Question 42 of 148
42. Question
If the sewage contains grease and fatty oils, these are removed in
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Question 43 of 148
43. Question
Composting and lagooning are the methods of
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Question 44 of 148
44. Question
The gas from sludge digestion tank is mainly composed of
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Question 45 of 148
45. Question
Assertion A: The consumption of water increases with increase in the distribution pressure. Reason R: Higher distribution pressure causes more loss and waste of water Select your answer according to the coding system given below
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Question 46 of 148
46. Question
The depression of water table in a well due to pumping will be maximum (Where R is the radius of influence)
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Question 47 of 148
47. Question
Ground water is usually free from
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Question 48 of 148
48. Question
On standard silica scale, the turbidity in drinking water should be limited to
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Question 49 of 148
49. Question
The settling velocity of a particle in a sedimentation tank increases if
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Question 50 of 148
50. Question
As compared to rapid sand filters, slow sand filters give
(i) Slower filtration rate
(ii) Higher filtration rate
(iii) Lesser efficiency in removal of bacteria
(iv) Higher efficiency in removal of bacteria The correct answer is -
Question 51 of 148
51. Question
Chlorine demand of water is equal to
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Question 52 of 148
52. Question
In lime-soda process
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Question 53 of 148
53. Question
Which of the following methods of analysis of water distribution system is most suitable for long and narrow pipe system?
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Question 54 of 148
54. Question
Which of the following sewers is preferred for combined system of sewage?
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Question 55 of 148
55. Question
An egg shaped section of sewer
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Question 56 of 148
56. Question
Sewage treatment units are normally designed for
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Question 57 of 148
57. Question
The means of access for inspection and cleaning of sewer line is known as
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Question 58 of 148
58. Question
The maximum efficiency of BOD removal is achieved in
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Question 59 of 148
59. Question
For the same solid content, if the quantity of sludge with moisture content of 98% is X, then the quantity of sludge with moisture content of 96% will be
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Question 60 of 148
60. Question
The process of lagooning is primarily a means of
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Question 61 of 148
61. Question
The per capital consumption of a locality is affected by
(i) Climatic conditions
(ii) Quality of water
(iii) Distribution pressure The correct answer is -
Question 62 of 148
62. Question
Select the correct relationship between porosity (N), specific yield (y) and specific retention (R)
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Question 63 of 148
63. Question
The maximum permissible limit for fluoride in drinking water is
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Question 64 of 148
64. Question
The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of
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Question 65 of 148
65. Question
The amount of coagulant needed for coagulation of water increases with
(i) Increase in turbidity of water
(ii) Decrease in turbidity of water
(iii) Increase in temperature of water
(iv) Decrease in temperature of water The correct answer is -
Question 66 of 148
66. Question
The rate of Alteration of pressure filters is
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Question 67 of 148
67. Question
The treatment of water with bleaching powder is known as
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Question 68 of 148
68. Question
Activated carbon is used for
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Question 69 of 148
69. Question
A pipe conveying sewage from plumbing system of a single building to common sewer or point of immediate disposal is called
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Question 70 of 148
70. Question
The self cleansing velocity for all sewers in India is usually
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Question 71 of 148
71. Question
The type of sewer which is suitable for both combined and separate system is
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Question 72 of 148
72. Question
In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20°C. The BOD of raw sewage will be
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Question 73 of 148
73. Question
Corrosion in concrete sewers is caused by
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Question 74 of 148
74. Question
The main disadvantage of oxidation pond is that
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Question 75 of 148
75. Question
Most of the bacteria in sewage are
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Question 76 of 148
76. Question
The hourly variation factor is usually taken as
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Question 77 of 148
77. Question
The maximum discharge of a tube well is about
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Question 78 of 148
78. Question
Turbidity is measured on
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Question 79 of 148
79. Question
The overflow rate for plain sedimentation tanks is about
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Question 80 of 148
80. Question
Assertion A: Slow sand filters are more efficient in removal of bacteria than rapid sand filters. Reason R: The sand used in slow sand filters is finer than that in rapid sand filters
Select your answer based on the coding system given below: -
Question 81 of 148
81. Question
Which of the following chemical compounds can be used for de-chlorination of water?
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Question 82 of 148
82. Question
Hardy cross method of analysis of distribution system
(i) Involves successive trials
(ii) Takes economic aspects into account
(iii) Is time consuming The correct answer is -
Question 83 of 148
83. Question
Average rate of water consumption per head per day as per Indian Standard is
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Question 84 of 148
84. Question
The hydraulic mean depth (HMD) for an egg-shaped sewer flowing two-third full is
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Question 85 of 148
85. Question
Select the correct statement.
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Question 86 of 148
86. Question
Laying of sewers is usually done with the help of
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Question 87 of 148
87. Question
For normal sludge, the value of sludge index for Indian conditions is
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Question 88 of 148
88. Question
If the average daily consumption of a city is 100,000 m3, the maximum daily consumption on peak hourly demand will be
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Question 89 of 148
89. Question
The most common cause of acidity in water is
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Question 90 of 148
90. Question
The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about
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Question 91 of 148
91. Question
The detention period and overflow rate respectively for plain sedimentation as compared to sedimentation with coagulation are generally
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Question 92 of 148
92. Question
The effective size of sand particles used in slow sand filters is
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Question 93 of 148
93. Question
In chlorination, with the rise in temperature of water, death rate of bacteria
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Question 94 of 148
94. Question
The method of analysis of distribution system in which the domestic supply is neglected and fire demand is considered is
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Question 95 of 148
95. Question
The specific gravity of sewage is
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Question 96 of 148
96. Question
Which of the following retards the self purification of stream?
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Question 97 of 148
97. Question
Sewerage system is designed for
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Question 98 of 148
98. Question
In facultative stabilization pond, the sewage is treated by
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Question 99 of 148
99. Question
A pipe which is installed in the house drainage to preserve the water seal of traps is called
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Question 100 of 148
100. Question
The distribution mains are designed for
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Question 101 of 148
101. Question
The type of valve, which is provided on the suction pipe in a tube-well, is
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Question 102 of 148
102. Question
Alkalinity in water is expressed as milligrams per litre in terms of equivalent
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Question 103 of 148
103. Question
The length of rectangular sedimentation tank should not be more than( Where B is the width of the tank)
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Question 104 of 148
104. Question
In water treatment, rapid gravity filters are adopted to remove
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Question 105 of 148
105. Question
Disinfection of water results in
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Question 106 of 148
106. Question
The type of valve which is provided to control the flow of water in the distribution system at street corners and where the pipe lines intersect is
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Question 107 of 148
107. Question
The design discharge for the separate sewer system shall be taken as
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Question 108 of 148
108. Question
The most commonly used sewer under culverts is
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Question 109 of 148
109. Question
The relative stability of a sewage sample, whose dissolved oxygen is same as the total oxygen required to satisfy BOD, is
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Question 110 of 148
110. Question
For satisfactory working of a sludge digestion unit, the pH range of digested sludge should be maintained as
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Question 111 of 148
111. Question
As compared to geometrical increase method of forecasting population, arithmetical increase method gives
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Question 112 of 148
112. Question
The phenolic compounds in public water supply should not be more than
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Question 113 of 148
113. Question
Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about
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Question 114 of 148
114. Question
Double filtration is used
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Question 115 of 148
115. Question
The major disadvantage of lime soda process of water softening is that
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Question 116 of 148
116. Question
Scour valves are provided
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Question 117 of 148
117. Question
The velocity of flow does not depend on
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Question 118 of 148
118. Question
The ratio of 5 day BOD to ultimate BOD is about
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Question 119 of 148
119. Question
Septic tank is a
(i) Settling tank
(ii) Digestion tank
(iii) Aeration tank The correct answer is -
Question 120 of 148
120. Question
The population of a town in three consecutive years are 5000, 7000 and 8400 respectively. The population of the town in the fourth consecutive year according to geometrical increase method is
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Question 121 of 148
121. Question
Which of the following values of pH represents a stronger acid?
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Question 122 of 148
122. Question
The alum, when added as a coagulant in water
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Question 123 of 148
123. Question
Cleaning is done by
(i) Scraping and removal in filters slow sand
(ii) Back washing in slow sand filters
(iii) Scraping and removal in filters rapid sand
(iv) Backwashing in rapid sand filters The correct answer is -
Question 124 of 148
124. Question
As compared to cast iron pipes, steel pipes are
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Question 125 of 148
125. Question
The design discharge for the combined sewer system shall be taken as
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Question 126 of 148
126. Question
If Biochemical oxygen demand (BOD) of a town is 20000 kg/day and BOD per capita per day is 0.05 kg, then population equivalent of town is
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Question 127 of 148
127. Question
The detention period for oxidation ponds is usually kept as
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Question 128 of 148
128. Question
The devices which are installed for drawing water from the sources are called
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Question 129 of 148
129. Question
Residual chlorine in water is determined by
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Question 130 of 148
130. Question
The percentage of chlorine in fresh bleaching powder is about
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Question 131 of 148
131. Question
Sewerage system is usually designed for
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Question 132 of 148
132. Question
The characteristics of fresh and septic sewage respectively are
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Question 133 of 148
133. Question
Which of the following unit works in anaerobic conditions?
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Question 134 of 148
134. Question
As compared to shallow wells, deep wells have
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Question 135 of 148
135. Question
The rate of filtration in slow sand filters in million litres per day per hectare is about
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Question 136 of 148
136. Question
Which of the following compounds is widely used for algae control?
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Question 137 of 148
137. Question
Dissolved oxygen in streams is
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Question 138 of 148
138. Question
If the coli form bacteria is present in a sample of water, then the coli-form test to be conducted is
(i) Presumptive coli-form test
(ii) Confirmed coli-form test
(iii) Completed coli-form test The correct answer is -
Question 139 of 148
139. Question
As compared to higher pH values, the contact period required for efficient chlorination at lower pH values is
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Question 140 of 148
140. Question
Standard BOD is measured at
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Question 141 of 148
141. Question
The velocity of flow of water in a sedimentation tank is about
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Question 142 of 148
142. Question
Alum as a coagulant is found to be most effective when pH range of water is
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Question 143 of 148
143. Question
The percentage of filtered water, which is used for backwashing in rapid sand filters, is about
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Question 144 of 148
144. Question
For a country like India, where rainfall is mainly confined to one season, the suitable sewerage system will be
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Question 145 of 148
145. Question
If the time of concentration is 9 minutes, then the intensity of rainfall according to British Ministry of Health formula will be
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Question 146 of 148
146. Question
The minimum and maximum diameters of sewers shall preferably be
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Question 147 of 148
147. Question
Sewage treatment units are designed for
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Question 148 of 148
148. Question
When there is no recirculation of sewage, then recirculation factor is