civil engineering MCQs – Page 65

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 Review each marked answer and report any item that may be outdated or unclear.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
1281. One Newton is equivalent to________________?
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A. 981 dyne

B. 1 kg-wt

C. 9.81 kg-wt

D. 1/9.81 kg-wt
1282. For the same solid content, if the quantity of sludge with moisture content of 98% is X, then the quantity of sludge with moisture content of 96% will be__________________?
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A. X/4

B. X/2

C. 2X

D. X

1283. 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 filtration rate

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

E. correct answer is?

1284. Disinfection of water results in______________?
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A. removal of turbidity

B. killing of disease bacteria

C. complete sterilisation

D. removal of hardness

1285. The position of center of pressure on a plane surface immersed vertically in a static mass of fluid is______________?
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A. none of the above

B. at the centroid of the submerged area

C. always above the centroid of the area

D. always below the centroid of the area
1286. The type of sewer which is suitable for both combined and separate system is_____________?
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A. horse-shoe type sewer

B. circular sewer

C. egg shaped sewer

D. semi-elliptical sewer

1287. The hydraulic mean depth (HMD. for an egg-shaped sewer flowing two-third full is_______________?
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A. none of the above

B. equal to HMD when flowing full

C. less than HMD when flowing full

D. greater than HMD when flowing full
1288. 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. Hardy cross method

B. equivalent pipe method

C. electrical analysis method

D. circle method
1289. The major disadvantage of lime soda process of water softening is that_________________?
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A. it is unsuitable for softening the water of excessive hardness

B. huge amount of precipitate is formed which creates a disposal problem

C. it is unsuitable for turbid and acidic water

D. the effluent cannot be reduced to zero hardness

1290. The alum, when added as a coagulant in water_______________?
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A. does not affect pH value of water

B. increases pH value of water

C. does not require alkalinity in water for flocculation

D. decreases pH value of water
1291. The force polygon representing a set of forces in equilibrium is a_____________________?
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A. parallelogram

B. open polygon

C. closed polygon

D. triangle

1292. The process in which the chlorination is done beyond the break point is known as_________________?
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A. break point chlorination

B. prechlorination

C. super chlorination

D. post chlorination

1293. In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20C. The BOD of raw sewage will be___________?
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A. 300 ppm

B. 200 ppm

C. 400 ppm

D. 100 ppm

1294. Rate of change of angular momentum is equal to_______________?
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A. force

B. impulse

C. linear momentum

D. torque
1295. The rate of Alteration of pressure filters is_________________?
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A. equal to that of slow sand filters

B. greater than that of rapid sand filters

C. less than that of slow sand filters

D. in between the filtration rate of slow sand filters and rapid sand filters

1296. The settling velocity of a particle in a sedimentation tank increases if_________________?
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A. the surface area of tank is increased

B. the depth of tank is decreased

C. none of the above

D. particle size is decreased

1297. Which of the following is an incorrect statement ?
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A. Coefficient of contraction of a venturimeter is unity

B. Flow nozzle is cheaper than venturimeter but has higher energy loss

C. Discharge is independent of orientation of venturimeter whether it is horizontal, vertical or inclined

D. None of the above statement is correct.
1298. The ratio of average velocity to maximum velocity for steady laminar flow in circular pipes is_______________?
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A. 3-Feb

B. 2-Mar

C. 2

D. 1/2
1299. 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
1300. A sewer that receives the discharge of a number of house sewers is called________________?
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A. intercepting sewer

B. house sewer

C. submain sewer

D. lateral sewer