civil engineering MCQs – Page 222

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 Review each marked answer and report any item that may be outdated or unclear.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
4421. 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

4422. 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

4423. The treatment of water with bleaching powder is known as________________?
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A. hypochlorination

B. super chlorination

C. dechlorination

D. prechlorination

4424. 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

4425. The hourly variation factor is usually taken as______________?
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A. 1.8

B. 2.7

C. 2

D. 1.5
4426. 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

4427. 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

4428. As compared to cast iron pipes, steel pipes are______________?
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A. costlier

B. heavier

C. less susceptible to corrosion

D. stronger
4429. 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
4430. 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
4431. Septic tank is a______________?
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A. aeration tank</strong>

B. settling tank

C. correct answer is?

D. digestion tank

4432. 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?

4433. 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
4434. 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
4435. 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
4436. 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

4437. 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

4438. The length of rectangular sedimentation tank should not be more than_______________?
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A. B

B. 4B

C. 2B

D. 8B

4439. 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

4440. 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