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

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

2741. Pick up the correct statement from the following?
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A. All the above

B. Inlets are provided on the road surface at the lowest point for draining rain water

C. Inlets are generally provided at an interval of 30 m to 60 m along straight roads

D. Inlets having horizontal openings, are called horizontal inlets

2742. Pick up the correct statement from the following?
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A. Bangalore method of composting involves decomposing under anaerobic conditions

B. Indore method of composting involves decomposition under aerobic conditions

C. all of these

D. Fully stabilised refuse by the Bangalore method of compositing is a powdery mass called humus

2743. A piece of metal of specific gravity 13.6 is placed in mercury of specific gravity 13.6, what fraction of it volume is under mercury ?
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A. the metal piece will simply float over the mercury

B. none of the above

C. whole of the metal piece will be immersed with its top surface just at mercury level

D. metal piece will sink to the bottom

E. the metal piece will be immersed in mercury by half

2744. Kjeldahl nitrogen is a mixture of___________________?
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A. Nitrogen and organic nitrogen

B. All the above

C. Organic nitrogen and ammonia

D. Ammonia and nitrogen

2745. If the diameter of a sewer is 150 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

2746. If the depth of flow in a circular sewer is 1/4th of its diameter D, the wetted perimeter is______________?
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A. D

B. /3

C. /2

D. /4

2747. To test chemical oxygen demand (C.O.D.) of sewage, organic matter is oxidised by potassium dichromate in the presence of_______________?
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A. Nitric acid

B. Hydrochloric acid

C. Citric acid

D. Sulphuric acid
2748. Kinematic viscosity is dependent upon________________?
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A. pressure

B. distance

C. level

D. flow

E. density
2749. During purification process of sewage the gas given off, is________________?
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A. All the above

B. Carbon dioxide

C. Ammonia

D. Hydrogen

2750. If is the rugosity coefficient, is the bed slope of sewer, the velocity of flow in m/sec may be obtained by the formula V = (1/n) r2/3 s1/2 evolved by_________________?
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A. Kutter

B. Bazin

C. Chezy

D. Manning