environmental engineering MCQs – Page 6

Practise focused environmental engineering questions with marked answers for exam preparation and subject revision.

environmental engineering Mcqs

101. Dissolved oxygen in streams is______________?
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A. same throughout the day

B. maximum at midnight

C. maximum at noon

D. minimum at noon

102. The length of rectangular sedimentation tank should not be more than_______________?
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A. B

B. 4B

C. 2B

D. 8B

103. Sewerage system is designed for_______________?
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A. minimum flow only

B. maximum and minimum flow

C. maximum flow only

D. average flow only

104. The settling velocity of a particle in a sedimentation tank depends on__________________?
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A. depth of tank

B. surface area of tank

C. both depth and surface area of tank

D. none of the above

105. The velocity of flow does not depend on_______________?
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A. grade of sewer

B. hydraulic mean depth of sewer

C. roughness of sewer

D. length of sewer

106. Disinfection of water results in______________?
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A. removal of turbidity

B. removal of hardness

C. complete sterilisation

D. killing of disease bacteria

107. A pipe which is installed in the house drainage to preserve the water seal of traps is called______________?
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A. antisiphonage pipe

B. soil pipe

C. waste pipe

D. vent pipe

108. Sewage treatment units are normally designed for______________?
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A. 5-10 years

B. 15-20 years

C. 30-40 years

D. 40-50 years

109. 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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A. 2X

B. X/2

C. X/4

D. X

110. If the coliform bacteria is present in a sample of water, then the coliform test to be conducted is_____________?
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A. confirmed coliform test

B. completed coliform test</strong>

C. correct answer is ?

D. presumptive coliform test

111. The rate of Alteration of pressure filters is_________________?
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A. greater than that of rapid sand filters

B. in between the filtration rate of slow sand filters and rapid sand filters

C. less than that of slow sand filters

D. equal to that of slow sand filters

112. Standard EDTA (ethylene diamine tetra acetic aciD. solution is used to determine the_______________?
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A. hardness in water

B. residual chlorine in water

C. turbidity in water

D. dissolved oxygen in water

113. The pipe which is used to carry the discharge from sanitary fittings like bath rooms, kitchens etc. is called_______________?
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A. antisiphonage pipe

B. waste pipe

C. vent pipe

D. soil pipe

114. The detention period in coagulation tanks is usually kept as_______________?
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A. 2 to 6 hours

B. 1 to 2 minutes

C. 2 to 6 days

D. 30 to 45 minutes

115. Most suitable section of sewer in separate sewage system is________________?
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A. rectangular section

B. circular section

C. modified egg shaped section

D. standard form of egg shaped sewer

116. The gas from sludge digestion tank is mainly composed of __________________?
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A. nitrogen

B. methane

C. hydrogen sulphide

D. carbon dioxide

117. The means of access for inspection and cleaning of sewer line is known as_______________?
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A. catch basin

B. drop manhole

C. manhole

D. inlet

118. Scour valves are provided ______________?
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A. at the foot of rising main along the slope to prevent back running of water

B. at every summit of rising mains

C. at street corners to control the flow of water

D. at every depression and dead ends to drain out the waste water that may collect there

119. The phenolic compounds in public water supply should not be more than_______________?
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A. 0.1 ppm

B. 0.01 ppm

C. 0.001 ppm

D. 0.0001 ppm

120. The self cleansing velocity for all sewers in India is usually_________________?
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A. 1.5 m/sec to 2.0 m/sec

B. 3.0 m/sec to 3.5 m/sec

C. less than 1.0 m/sec

D. 1.0 m/sec to 1.2 m/sec

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