civil engineering MCQs – Page 255

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 Review each marked answer and report any item that may be outdated or unclear.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
5081. If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains__________________?
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A. Methane

B. Carbon dioxide

C. Hydrogen sulphide

D. Oxygen

5082. In SI units the power of sound is represented in __________________?
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A. Watts

B. Newtons

C. Kgs

D. Joules

5083. Water content of sewage is about___________________?
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A. 90%

B. 99%

C. 95%

D. 9.9 %
5084. Drop manholes are the manholes___________________?
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A. With depths more than 3.5 m

B. Without entry ladders

C. Having drains at different levels

D. Without manhole covers

5085. Pick up the incorrect size of stone ware sewers_________________?
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A. 82.5 cm

B. None of these

C. 52.5 cm

D. 67.5 cm

5086. Primary treatment of sewage consists of removal of__________________?
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A. Large suspended organic solids

B. Sand and girt

C. Floating materials

D. Oil and grease

5087. The minimum recommended diameter of sewers, is_________________?
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A. 10 cm

B. 15 cm

C. 5 cm

D. 20 cm

5088. The effluent of a septic tank is_________________?
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A. None of these

B. Foul and contains dissolved and suspended solids

C. Fit for discharge into any open drain

D. As good as that from a complete treatment

5089. For a peak discharge of 0.0157 cumec, with a velocity of 0.9 m/sec, the diameter of the sewer main, is________________?
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A. 15 cm

B. 18 cm

C. 12 cm

D. 10 cm

5090. The settlement of a particle in sedimentation tank, is affected by_____________________?
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A. All the above

B. Velocity of flow

C. Size and shape of solid

D. Viscosity of water

5091. In areas where light rains are uniformly distributed throughout the year, the type of sewerage system to be adopted is_______________?
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A. None of these

B. Combined system

C. Separate system

D. Partially combined system

5092. In case of sewer lines_________________?
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A. Obstruction test is carried out with the help of smooth ball of diameter 13 mm

B. Water test is carried out to check water tightness of the joints

C. Test for straightness is carried out with the help of a lamp and mirror

D. All the above
5093. If the discharge of a sewer running half is 628 1.p.s., i = 0.001, and n = 0.010, the diameter of the sewer, is__________________?
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A. 1.69 m

B. 1.39 m

C. 1.59 m

D. 1.49 m

5094. Fresh sewage is generally_____________________?
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A. Acidic

B. Alkaline

C. A source of objectionable odour

D. Highly decomposed

5095. The ratio of maximum sewage flow to average sewage flow for trunk mains having diameters more than 1.25 m, is____________________?
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A. 4

B. 3

C. 1.5

D. 2

5096. For estimating the peak run off the rational formula Q = 0.0278 KpA was evolved by______________?
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A. Frubling

B. Kinchling

C. All the above

D. Lloyd Davis

5097. In septic tanks, decomposition of organic bacteria, is done by_____________________?
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A. Anaerobic bacteria

B. Aerobic bacteria

C. Both types of bacterias

D. None of these

5098. If the depth of partial flow in a sewer of diameter 2 m, is 50 cm, its wetted perimeter is____________________ ?
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A. 3-Jan

B. 0/2

C. 2 /3

D. 0/3

5099. Stone ware pipes are_______________?
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A. Highly resistant to sulphide corrosion

B. Especially suited to pressure pipes

C. Highly impervious

D. Hydraulically efficient because of their smooth interior surface

5100. A drop manhole is provided if__________________?
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A. None of these

B. A sewer drops from a height

C. A lamp is inserted to check obstruction

D. A branch sewer joins the main sewer at higher level