civil engineering MCQs – Page 221

Practise multiple-choice questions from civil engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

civil engineering Mcqs
4401. Activated carbon is used for_____________?
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A. removing odours

B. removing corrosiveness

C. removing hardness

D. disinfection

4402. 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
4403. 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
4404. 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

4405. 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

4406. 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

4407. 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
4408. 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?

4409. 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

4410. 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

4411. 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
4412. 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
4413. 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

4414. 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

4415. 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

4416. 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

4417. Turbidity is measured on_______________?
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A. standard cobalt scale

B. standard platinum scale

C. standard silica scale

D. platinum cobalt scale

4418. 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

4419. 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

4420. As compared to shallow-wells, deep wells have______________?
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A. more depth

B. less depth

C. less discharge

D. more discharge