civil engineering MCQs – Page 136

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 Review each marked answer and report any item that may be outdated or unclear.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
2701. In a residential colony, sewers of diameters 100 mm, 150 mm and 225 mm were laid with a gradient 1 in 120. Which portion of the sewage system does not choke in due course of time?
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A. All of these

B. 225 mm dia.

C. 100 mm dia.

D. 150 mm dia.

2702. An object having 10 kg mass weighs 9.81kg on a spring balance. The value of g at this place is___________________?
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A. 9 m/sec .

B. 10m/sec2

C. 9.75 m/sec2

D. 10.2/m sec

E. 9.81 m/sec2

2703. If is the diameter of upper circular portion, the overall depth of New Egg shaped sewer section, Is_____________________?
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A. 1.250 D

B. 1.350 D

C. 1.625 D

D. 1.425 D

2704. Property of a fluid by which its own molecules are attracted is called ________________?
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A. cohesion

B. viscosity

C. compressibility

D. surface tension

E. adhesion

2705. The sewer pipe which carries sewage from a building for immediate disposal is______________?
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A. Intercepting sewer

B. Main sewer

C. House sewer

D. Lateral sewer

2706. For trunk and out-fall, the type of sewers generally used, is_____________________?
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A. Parabolic shaped

B. Standard egg shaped

C. Circular shaped

D. Horse shoe shaped
2707. Pick up the incorrect statement from the following?
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A. The gases produced in sludge digestion process, contain 75% methane

B. The process of decomposing the organic matter under controlled anaerobic conditions, is called sludge digestion

C. The gases produced in sludge digestion process, contain 75% carbon dioxide

D. Sludge digestion is carried out in sludge tank

2708. An ideal flow of any fluid must fulfill the following______________?
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A. Newtons law of motion

B. Continuity equation

C. Boundary layer theory

D. Pascal law

E. Newtons law of viscosity

2709. Pick up the correct statement from the following _________________?
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A. The process of burning the screenings, is known as compositing

B. All the above

C. The materials separated by screens, is called screenings

D. The screenings are disposed off either by burning or by burial or by dumping

2710. Drop manholes at the junctions of sewer lines, are provided if________________?
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A. Sewer line runs along a main road

B. Ordinary manhole cannot be built

C. Invert level of a branch sewer is more than 60 cm that of the main sewer

D. Two sewer lines intersect

2711. The ratio of design discharge to the surface area of a sedimentation tank is called____________________?
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A. All of these

B. Overflow velocity

C. Overflow rate

D. Surface loading

2712. The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is________________?
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A. d (0.285d + 0.011H)/Q

B. d (0.785d + 0.011H)/Q

C. d (0.011d + 0.785H)/Q

D. d (0.022d + 0.085H)/Q

2713. Sewer pipes need be checked for_________________?
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A. Minimum flow

B. Maximum flow

C. Both A. and B.

D. None of these

2714. For providing an Indian type W.C., the R.C.C. slabs in the toilet portion__________________?
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A. Should be kept 20 cm above the adjacent portion

B. Need not be sunk

C. Should be sunk by 50 cm

D. Should be sunk by 20 cm

2715. 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. Carbon dioxide

B. Methane

C. Oxygen

D. Hydrogen sulphide
2716. 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. 4000 kg.

B. 1500 kg

C. 500 kg

D. 2000 kg

E. 1000 kg

2717. Practical fluids____________________?
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A. possess surface tension

B. possess none of the above properties

C. possess all the above properties

D. are viscous

E. are compressible

2718. The standard B.O.D. of water is taken for_________________?
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A. 2 days

B. 3 days

C. 1 day

D. 5 days
2719. In sewers the highest non-scouring velocity is achieved in________________?
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A. Glazed bricks sewers

B. Cast iron sewers

C. Cement concrete sewers

D. Stone ware sewers

2720. The ratio of depths at partial flo________________?
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A. 1

B. (1

C. (1

D. 1