civil engineering MCQs – Page 63

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 Review each marked answer and report any item that may be outdated or unclear.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
1241. Generally the detention period for grit chambers is kept as_______________?
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A. 12 hours

B. 2-4 hours

C. 1 minute

D. 5 minutes

1242. Which of the following chemical compounds can be used for dechlorination of water ?
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A. sulphur dioxide

B. bleaching powder

C. chloramines

D. carbon dioxide

1243. Period of cleaning of slow sand filters is about________________?
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A. 2-3 months

B. 1-2 year

C. 24 48 hours

D. 10-12 days

1244. Hardy cross method of analysis of distribution system________________?
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A. involves successive trials

B. correct answer is?

C. is time consuming</strong>

D. takes economic aspects into account

1245. The depth d below the free surface at which the point velocity is equal to the average velocity of flow for a uniform laminar flow with a free surface, will be_________________?
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A. 0.707 D

B. 0.423 D

C. 0.577 D

D. 0.223 D

1246. Select the correct relationship between porosity (N), specific yield (y) and specific retention (R)________________?
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A. R > (N + y)

B. y = N + R

C. N = y + R

D. R = N + y

1247. A simple pendulum of length / has an energy E, when its amplitude is A. If the length of pendulum is doubled, the energy will be___________________?
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A. E

B. 2E

C. 4E

D. E/2
1248. If x is the distance from leading edge, then the boundary layer thickness in laminar flow varies as________________?
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A. x/7

B. x

C. x

D. x

1249. Sewerage system is designed for_______________?
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A. maximum flow only

B. maximum and minimum flow

C. minimum flow only

D. average flow only

1250. The detention period and overflow rate respectively for plain sedimentation as compared to sedimentation with coagulation are generally_______________?
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A. less and less

B. less and more

C. more and more

D. more and less
1251. The population of a town in three consecutive years are 5000, 7000 and 8400 respectively. The population of the town in the fourth consecutive year according to geometrical increase method is________________?
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A. 10920

B. 9800

C. 10100

D. 9500

1252. Most suitable section of sewer in separate sewage system is________________?
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A. circular section

B. standard form of egg shaped sewer

C. modified egg shaped section

D. rectangular section

1253. It is observed that in a certain sinusoidal oscillation, the amplitude is linearly dependent on the frequency f. If the maximum velocity during the oscillation is V, then V must be proportional to_________________?
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A. f

B. 1/f

C. 1/f2

D. f2
1254. The most common cause of acidity in water is_______________?
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A. hydrogen

B. oxygen

C. nitrogen

D. carbon dioxide
1255. The member forces in a statically in determinate truss____________________?
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A. may be obtained by graphic statics

B. can be obtained by graphic statics by trial and error

C. cannot be obtained by graphic statics

D. can be obtained by graphic statics

1256. Which of the following has highest coefficient of discharge ?
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A. venturimeter

B. sharp edged orifice

C. Bordas mouthpiece running full

D. CipoUetti weir

1257. The velocity distribution for laminar flow through a circular tube__________________?
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A. is constant over the cross-section

B. none of the above

C. varies parabolically with maximum at the centre

D. varies linearly from zero at walls to maximum at centre

1258. In chlorination, with the rise in temperature of water, death rate of bacteria____________?
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A. remains unaffected

B. decreases

C. none of the above

D. increases
1259. For laminar flow in a pipe of circular cross-section, the Darcys friction factor f is________________?
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A. inversely proportional to Reynolds number and directly proportional to pipe wall roughness

B. directly proportional to Reynolds number and independent of pipe wall roughness

C. inversely proportional to Reynolds number and indpendent of pipe wall roughness

D. directly proportional to pipe wall roughness and independent of Reynolds number

1260. The pathogens can be killed by_______________?
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A. chlorination

B. none of the above

C. oxidation

D. nitrification