environmental engineering MCQs – Page 5

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

environmental engineering Mcqs

81. Turbidity is measured on_______________?
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A. standard cobalt scale

B. standard platinum scale

C. standard silica scale

D. platinum cobalt scale

82. The process in which the chlorination is done beyond the break point is known as_________________?
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A. break point chlorination

B. super chlorination

C. prechlorination

D. post chlorination

83. The main disadvantage of oxidation pond is that________________?
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A. BOD removal is very low

B. maintenance and operation cost are high

C. large area is required for construction

D. none of the above

84. As compared to shallow-wells, deep wells have______________?
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A. more depth

B. less depth

C. less discharge

D. more discharge

85. Laying of sewers is usually done with the help of________________?
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A. a theodolite

B. sight rails and boning rods

C. a plane table

D. a compass

86. Which of the following causes a decrease in per capita consumption ?
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A. use of metering system

B. good quality of water

C. hotter climate

D. better standard of living of the people

87. The treatment of water with bleaching powder is known as________________?
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A. hypochlorination

B. super chlorination

C. dechlorination

D. prechlorination

88. Settling velocity increases with_______________?
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A. temperature of liquid

B. specific gravity of solid particles

C. depth of tank

D. size of particles

89. The hourly variation factor is usually taken as______________?
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A. 1.8

B. 2.7

C. 2

D. 1.5

90. The maximum efficiency of BOD removal is achieved in______________?
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A. oxidation ditch

B. aerated lagoons

C. oxidation pond

D. trickling filters

91. The most commonly used sewer under culverts is_______________?
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A. circular brick sewer

B. circular cast iron sewer

C. semi-elliptical sewer

D. horse-shoe type sewer

92. As compared to cast iron pipes, steel pipes are______________?
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A. costlier

B. heavier

C. less susceptible to corrosion

D. stronger

93. On standard silica scale, the turbidity in drinking water should be limited to_______________?
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A. 30 ppm

B. 20 ppm

C. 50 ppm

D. 10 ppm

94. The distribution mains are designed for________________?
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A. maximum daily demand

B. average daily demand

C. maximum hourly demand

D. maximum hourly demand on maximum day

95. Septic tank is a______________?
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A. aeration tank</strong>

B. settling tank

C. correct answer is?

D. digestion tank

96. Hardy cross method of analysis of distribution system________________?
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A. involves successive trials

B. takes economic aspects into account

C. is time consuming</strong>

D. correct answer is?

97. Select the correct relationship between porosity (N), specific yield (y) and specific retention (R)________________?
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A. R > (N + y)

B. R = N + y

C. y = N + R

D. N = y + R

98. Which of the following unit works in anaerobic conditions ?
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A. activated sludge treatment

B. trickling filters

C. sedimentation tank

D. sludge digestion tank

99. In chlorination, with the rise in temperature of water, death rate of bacteria____________?
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A. none of the above

B. remains unaffected

C. decreases

D. increases

100. The slope of sewer shall be__________________?
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A. zero

B. given in the direction of natural slope of ground

C. given in the direction opposite to natural slope of ground

D. steeper than 1 in 20

Showing 81 to 100 of 147 mcqs