civil engineering MCQs – Page 146

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 Review each marked answer and report any item that may be outdated or unclear.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
2901. Sewer pipes are designed for maximum discharge with 25% to 33% vacant cross-sectional area for__________________?
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A. Under estimates of maximum and average flows

B. Unexpected large scale infiltration of stream water

C. All of the above

D. Unexpected increase in the population

2902. If the diameter of sewer is 225 mm, the gradient required for generating self cleansing velocity, is___________________?
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A. 1 in 100

B. 1 in 60

C. 1 in 120

D. None of these

2903. The sewer which transports the sewage to the point of treatment, is called________________?
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A. House sewer

B. Out-fall sewer

C. Branch sewer

D. Main sewer

2904. For evaporation and measurement of settable solids, the apparatus used, is________________?
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A. An Imhoff cone

B. A test tube

C. A jar

D. A breaker

2905. pH value of sludge during alkaline regression stage, is__________________?
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A. More than 7

B. Less than 7

C. More than 6

D. Less than 6

2906. The minimum recommended diameter of sewers, is_________________?
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A. 5 cm

B. 20 cm

C. 10 cm

D. 15 cm
2907. The width of a rectangular sewer is twice its depth while discharging 1.5 m/sec. The width of the sewer is______________?
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A. 0.68 m

B. 1.36 m

C. 1.76 m

D. 0.88 m

2908. In sewers the effect of scouring is more on__________________?
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A. All sides

B. Top side

C. Horizontal side

D. Bottom side
2909. If 850 kg liquid occupies volume of one cubic meter, men 0.85 represents its_______________?
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A. specific weight

B. specific density

C. specific mass

D. none of the above

E. specific gravity
2910. Fluid is a substance which offers no resistance to change of_________________?
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A. temperature

B. flow

C. pressure

D. volume

E. shape
2911. The flow velocity in detritus tanks is________________?
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A. None of these

B. 0.05 m/sec

C. 1.25 m/sec

D. 0.09 m/sec
2912. The buoyancy depends on__________________?
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A. pressure of the liquid displaced

B. none of the above.

C. depth of immersion

D. mass of liquid displaced

E. viscosity of the liquid

2913. Cowl is provided at___________________?
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A. Upper end of ventilating column

B. Lower end of ventilating column

C. Upper end of the manhole

D. First step in manhole

2914. The normal value of over flow rates for plain primary sedimentation tanks, ranges between________________?
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A. 50,000 to 60,000 litres/sqm/day

B. 80,000 to 100,000 litres/sqm/day

C. 40,000 to 50,000 litres/sqm/day

D. 25,000 to 35,000 litres/sqm/day

2915. Which of the following is the unit of kinematic viscosity _________________?
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A. poise

B. stoke

C. none of the above

D. faraday

E. pascal

2916. A safety lamp when inserted in the upper portion of a manhole causes flames. It indicates the presence of______________?
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A. Petrol vapours

B. Carbondioxide gas

C. Methane gas

D. Hydrogen sulphide gas

2917. For very great pressures, viscosity of moss gases and liquids __________________?
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A. increases

B. remains same

C. decreases

D. shows erratic behaviour

E. none of the above.

2918. The laying of sewers is done with____________________?
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A. Clinometer

B. Theodolite

C. Level

D. Magnetic compass

2919. Clogging of sewers, is caused due to_______________?
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A. Low discharge

B. Greasy and oily matters

C. All the above

D. Silting

2920. A circular sewer section is preferred to because__________________?
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A. It provides maximum hydraulic mean depth

B. It provides maximum area for a given perimeter

C. It is cheaper in construction

D. All the above