civil engineering MCQs – Page 137

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 Review each marked answer and report any item that may be outdated or unclear.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
2721. Fresh sewage may become stale in_________________?
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A. Six hours

B. Two to three hours

C. Three to four hours

D. One hour

2722. The angle of contact in case of a liquid depends upon____________________?
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A. the nature of the liquid and the solid

B. the material which exists above the free surface of the liquid

C. both of die above

D. any one of the above

E. none of die above

2723. Dilution method of disposing of sewage, is not preferred to_______________?
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A. When sewage is fresh

B. When diluting water has high dissolved oxygen content

C. When diluting water is used for water supply near the point of sewage disposed

D. When the diluting water is having flow currents

2724. Fresh sewage is generally_____________________?
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A. Highly decomposed

B. Alkaline

C. Acidic

D. A source of objectionable odour

2725. 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. 0/3

C. 2 /3

D. 0/2

2726. The bulk modulus of elasticity __________________?
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A. is large when fluid is more compressible

B. has the dimensions of 1/pressure

C. is directly proportional to flow.

D. is independent of pressure and viscosity

E. increases with pressure
2727. Pick up the correct statement from the following?
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A. All the above

B. The circular sewers work efficiently if the sections run at least half full

C. The circular section of sewers provides maximum hydraulic mean depth

D. The circular sewers are provided for separate sewerage system

2728. Discrete or granular particles change their_________________ ?
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A. None of these

B. Shape

C. Weight

D. Size

2729. Drop manholes are the manholes___________________?
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A. Having drains at different levels

B. Without entry ladders

C. With depths more than 3.5 m

D. Without manhole covers

2730. 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

2731. The sewage discharge in a detritus tank of a treatment plant is 576 litres/sec with flow velocity of 0.2 m/sec. If the ratio of width to depth is 2, the depth is____________________?
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A. 110 cm

B. 150 cm

C. 100 cm

D. 120 cm
2732. Imhoff cone is used to measure________________?
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A. Total in organic solids

B. Total organic solids

C. Settleable solids

D. Total solids

2733. With self cleansing velocity in sewers___________________?
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A. Silting occurs at bottom

B. Scouring occurs at bottom

C. Both silting and scouring occur at bottom

D. Neither silting nor scouring occurs at bottom
2734. The stress-strain relation of the newtoneon fluid is________________?
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A. none of the above

B. inverse type

C. parabolic

D. hyperbolic

E. linear
2735. In 1000 kg of sewage, the total solids approximate___________________?
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A. 1 kg to 2.0 kg

B. 0.5 to 1.0 kg

C. 5 kg to 7.5 kg

D. 7.5 kg to 10 kg

2736. Fluid is a substance that_______________?
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A. has the same shear stress.at a point regardless of its motion

B. always expands until it fills any container

C. cannot be subjected to shear forces

D. flows

E. cannot remain at rest under action of any shear force
2737. If mercury in a barometer is replaced by water, the height of 3.75 cm of mercury will be following cm of water___________________?
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A. 51.7 cm

B. 52 cm

C. 50 cm

D. 52.2 cm

E. 51 cm
2738. Which one of the following tests is used for testing sewer pipes ?
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A. Ball test

B. All of these

C. Water test

D. Mirror test

2739. A fluid is said to be ideal, if it is________________?
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A. inviscous and incompressible

B. viscous and incompressible

C. inviscous and compressible

D. inviscous

E. incompressible

2740. Which one of the following statements regarding septic tanks is wrong ?
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A. A gap of 7.5 cm between the bottom of the covering slab and the top level of scum is provided

B. The depth of tank is kept equal to its width

C. The minimum width of septic level is 90 cm

D. The outlet invert level is kept 5 to 7.5 cm below the inlet invert level