civil engineering MCQs – Page 145

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 Review each marked answer and report any item that may be outdated or unclear.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

2881. hydraulically equivalent, the relationship which holds good, is _______________?
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A. D8/3 = 4 b8/3

B. D3/8 = 4 b3/8

C. D2/3 = 4 b2/3

D. D3/2 = 4 b3/2

2882. The specific weight of water is 1000 kg/m _______________?
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A. all the above

B. at norma] pressure of 760 mm

C. at 4C temperature

D. none of the above.

E. at mean sea level

2883. The moisture content of sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is_______________?
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A. 25%

B. 50 %

C. 10%

D. 5%

2884. Liquids________________?
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A. are not affected by change in pressure and temperature

B. cannot be compressed

C. GO are not viscous

D. occupy definite volume

E. none of the above

2885. The bulk modulus of elasticity with increase in pressure___________________?
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A. unpredictable

B. increases

C. increases first upto certain limit and then decreases

D. decreases

E. remains constant

2886. In olden days the type of section adopted in trunk and out fall sewers was__________________?
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A. Circular shaped

B. Horse shoe shaped

C. Egg shaped

D. Parabolic shaped

2887. An inverted siphon is designed generally for____________________?
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A. One pipe

B. Three pipes

C. Two pipes

D. Four pipes

2888. To prevent settling down of sewage both at the bottom and on the sides of a large sewer, self-cleaning velocity recommended for Indian conditions, is_________________?
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A. 0.75 m/sec

B. 0.50 m/sec

C. 0.60 m/sec

D. 0.70 m/sec

2889. The center of gravity of the volume of the liquid displaced by an immersed body is called________________?
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A. center of gravity

B. center of pressure

C. meta-center

D. none of the above

E. center of buoyancy

2890. If is the diameter of upper circular portion, the area of cross-section of a standard egg shaped sewer, is____________________?
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A. D

B. D

C. D

D. D

2891. Pick up the correct statement from the following?
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A. Aerobic bacteria flourish in the presence of oxygen

B. Anaerobic bacteria flourish in the absence of oxygen

C. Facultative bacteria flourish with or without oxygen

D. . All the above

2892. Alcohol is used in manometer, because___________________?
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A. ose the wrong statement ?

2893. The rate of accumulation of sludge per person per year, is_______________________?
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A. 20 litres

B. 15 litres

C. 10 litres

D. 25 litres

2894. The total pressure on the surface of a vertical sluice gate 2 m x 1 m with its top 2 m surface being 0.5 m below the water level will be___________________?
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A. 500 kg

B. 1000 kg

C. 1500 kg

D. 2000 kg

E. 4000 kg

2895. Stone ware pipes are_______________?
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A. Highly resistant to sulphide corrosion

B. Especially suited to pressure pipes

C. Hydraulically efficient because of their smooth interior surface

D. Highly impervious

2896. Imhoff cone is used to determine_____________________?
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A. None of these

B. Settleable solids

C. Dissolved solids

D. Suspended solids

2897. 5 days-biochemical oxygen demand (BOD5) is taken at a temperature of_________________?
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A. 20C

B. 25C

C. 15C

D. 0C

2898. The use of coarse screens for the disposal of sewage, may be dispensed with by______________?
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A. Comminutor

B. Shredder

C. Both A. and B.

D. Neither A. nor B.

2899. The factor responsible for purification of sewage in river is________________?
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A. Dissolved oxygen in water

B. All the above

C. Hydrology

D. Temperature

2900. The ratio of the diameter of a circular section and the side of a square section hydraulically equivalent, is____________________?
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A. 1.065

B. 1.075

C. 1.095

D. 1.085

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