environmental engineering MCQs – Page 4

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

environmental engineering Mcqs

61. The characteristics of fresh and septic sewage respectively are____________________?
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A. acidic and alkaline

B. alkaline and acidic

C. both acidic

D. both alkaline

62. Standard BOD is measured at________________?
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A. 20C 5day

B. 25C- 3day

C. 20C 1day

D. 30C- 5day

63. The time of concentration is defined as_______________?
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A. sum of (A) and (B)

B. the time taken by rainfall water to run from most distant point of water shed to the inlet of sewer

C. the time required for flow of water in sewer to the point under consideration

D. difference of (A) and (B)

64. Sewerage system is usually designed for_________________?
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A. 10 years

B. 25 years

C. 75 years

D. 50 years

65. Activated carbon is used for_____________?
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A. removing odours

B. removing corrosiveness

C. removing hardness

D. disinfection

66. The specific gravity of sewage is_______________?
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A. slightly less than 1

B. much greater than 1

C. equal to 1

D. slightly greater than 1

67. In facultative stabilization pond, the sewage is treated by________________?
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A. aerobic bacteria only

B. sedimentation

C. algae only

D. dual action of aerobic bacteria and anaerobic bacteria

68. The effective size of sand particles used in slow sand filters is_______________?
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A. 0.35 to 0.60 mm

B. 1.00 to 1.80 mm

C. 0.25 to 0.35 mm

D. 0.60 to 1.00 mm

69. The percentage of filtered water, which is used for backwashing in rapid sand filters, is about______________?
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A. 5 to 7

B. 0.2 to 0.4

C. 2 to 4

D. 0.4 to 1.0

70. 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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A. lOmm/hr

B. 20 mm/hr

C. 40 mm/hr

D. 4 mm/hr

71. The suitable layout of a distribution system for irregularly growing town is_______________?
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A. grid iron system

B. ring system

C. radial system

D. dead end system

72. The per capital consumption of a locality is affected by_________________?
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A. quality of water

B. climatic conditions

C. distribution pressure</strong>

D. correct answer is?

73. In lime-soda process________________?
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A. only carbonate hardness is removed

B. lime reduces the non-carbonate hard-ness and soda-ash removes the carbonate hardness

C. lime reduces the carbonate hardness and soda-ash removes the non-carbonate hardness

D. only non-carbonate hardness is re-moved

74. The maximum permissible limit for flouride in drinking water is______________?
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A. 5 mg/litre

B. 1.5 mg/litre

C. 0.1 mg/litre

D. 10 mg/litre

75. The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about______________?
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A. 1.0 to 5.0 ppm

B. 0.5 to 1.0 ppm

C. 0.01 to 0.05 ppm

D. 0.05 to 0.5 ppm

76. The devices which are installed for drawing water from the sources are called______________?
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A. aquifers

B. aquiclude

C. filters

D. intakes

77. Which of the following methods of analysis of water distribution system is most suitable for long and narrow pipe system ?
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A. circle method

B. Hardy cross method

C. equivalent pipe method

D. electrical analysis method

78. As compared to geometrical increase method of forecasting population, arithmetical increase method gives________________?
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A. accurate value

B. lesser value

C. higher value

D. same value

79. The alum, when added as a coagulant in water_______________?
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A. decreases pH value of water

B. does not affect pH value of water

C. increases pH value of water

D. does not require alkalinity in water for flocculation

80. The water carriage system of collection of waste product________________?
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A. is cheaper in initial cost than dry conservancy system

B. requires treatment before disposal

C. all of the above

D. creates hygenic problem

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