civil engineering MCQs – Page 218

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 Review each marked answer and report any item that may be outdated or unclear.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
4341. For a country like India, where rainfall is mainly confined to one season, the suitable sewerage system will be________________?
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A. partially separate system

B. combined system

C. separate system

D. partially combined system

4342. The suitable layout of distribution system for a city with roads of rectangular pattern is______________?
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A. ring system

B. dead end system

C. radial system

D. grid iron system
4343. The percentage of chlorine in fresh bleaching powder is about________________?
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A. 30 to 35

B. 40 to 50

C. 10 to 15

D. 20 to 25

4344. The suitable method of forecasting population for a young and rapidly increasing city is_________________?
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A. arithmetical increase method

B. incremental increase method

C. geometrical increase method

D. graphical method

4345. The method of analysis of distribution system in which the domestic supply is neglected and fire demand is considered is________________?
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A. circle method

B. electrical analysis method

C. equivalent pipe method

D. Hardy cross method

4346. The type of valve which allows water to flow in one direction but prevents its flow in the reverse direction is____________________?
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A. pressure relief valve

B. reflux valve

C. air relief valve

D. sluice valve

4347. Select the correct statement?
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A. 5 day BOD is greater than 4 day BOD keeping other conditions same

B. 5 day BOD is the ultimate BOD

C. BOD does nof depend on time

D. 5 day BOD is less than 4 day BOD keeping other conditions same
4348. If the average daily consumption of a city is 100,000 m3, the maximum daily consumption on peak hourly demand will be_______________?
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A. 270000 m3

B. 150000m3

C. 180000m3

D. 100000m3

4349. The velocity of flow of water in a sedimentation tank is about__________________?
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A. 15 to 30 cm/minute

B. 15 to 30 cm/sec.

C. 15 to 30 cm/hour

D. 5 to 10 cm/sec.

4350. The polluted water is one which_______________?
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A. contains pathogenic bacteria

B. consists of undesirable substances rendering it unfit for drinking and domestic use

C. is contaminated

D. is safe and suitable for drinking and domestic use

4351. The settling velocity of a particle in a sedimentation tank increases if_________________?
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A. the depth of tank is decreased

B. particle size is decreased

C. none of the above

D. the surface area of tank is increased

4352. When there is no recirculation of sewage, then recirculation factor is_______________?
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A. 0

B. 1

C. infinity

D. none of the above

4353. Which of the following retards the self purification of stream ?
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A. higher temperature

B. sunlight

C. none of the above

D. satisfying oxygen demand

4354. The amount of coagulant needed for coagulation of water increases with_______________?
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A. correct answer is?

B. decrease in turbidity of water

C. increase in turbidity of water

D. decrease in temperature of water</strong>

E. increase in temperature of water

4355. As compared to rapid sand filters, slow sand filters give______________?
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A. slower filtration rate

B. lesser efficiency in removal of bacteria

C. higher efficiency in removal of bacteria </strong>

D. higher filtration rate

E. correct answer is?

4356. The major disadvantage of lime soda process of water softening is that_________________?
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A. huge amount of precipitate is formed which creates a disposal problem

B. the effluent cannot be reduced to zero hardness

C. it is unsuitable for turbid and acidic water

D. it is unsuitable for softening the water of excessive hardness

4357. Disinfection efficiency is________________?
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A. increased at higher pH value of water

B. highest at pH value equal to 7

C. unaffected by pH value of water

D. reduced at higher pH value of water
4358. Chlorine demand of water is equal to________________?
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A. sum of applied and residual chlorine

B. residual chlorine

C. applied chlorine

D. difference of applied and residual chlorine
4359. The depression of water table in a well due to pumping will be maximum_______________?
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A. close to the well

B. re R is the radius of influence

C. at a distance R/2 from the well

D. none of the above

E. at a distance R from the well

4360. A sewer that receives the discharge of a number of house sewers is called________________?
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A. intercepting sewer

B. submain sewer

C. lateral sewer

D. house sewer