civil engineering Mcqs
2851. The settlement velocity of a solid (diameter 0.5 mm, specific gravity 1.75) in water having temperature 10C, is______________________?
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A. 500 cm/sec

B. 213.5 cm/sec

C. 413.5 cm/sec

D. 313.5 cm/sec
2852. Dimensions of surface tension are_________________?
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A. MlL r2

B. MlL2T2

C. MlLTx

D. MlLT2

E. MlLt

2853. Surface tension has the units of____________________?
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A. newtons/m

B. newton m

C. newtons

D. newtons/m

E. new tons/m
2854. Alcohol is used in manometers because_____________________?
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A. it has low vapour pressure

B. it is clearly visible

C. is provides suitable meniscus

D. it can provide longer column due to low density

E. it has low surface tension

2855. Pick up the correct statement from the following ?
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A. Turbidity is more in strong sewage

B. All the above

C. The sewage omits offensive odours after four hours

D. The black colour indicates septic sewage

2856. Bio-chemical oxygen demand (BOD) for the first 20 days in generally referred to_______________?
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A. Carbonaceous demand

B. First stage demand

C. Initial demand

D. All of these
2857. The sewage treatment units in which anaerobic decomposition of organic matter is used, are called________________?
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A. None of these

B. Sludge sedimentation tanks

C. Trickling filters

D. Imhoff tanks

2858. The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as____________________?
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A. center of gravity

B. center of buoyancy

C. center of pressure

D. none of the above

E. meta center

2859. Density of water is maximum at ___________________?
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A. 20C.

B. 100C

C. 0C

D. 4C

E. 0K

2860. The following is the physical characteristic of sewage___________________?
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A. Colour

B. Odour

C. All the above

D. Turbidity

2861. The suitable cross-section of sewers to carry combined flow, is__________________?
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A. Rectangular

B. Circular

C. Egg shaped

D. Horse shoe shaped

2862. If q is the average sewage flow from a city of population P, the maximum sewage flow______________?
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A. Q = [(5 + )/((15 + )] q

B. Q = [(18 + P)/(4 + )] q

C. Q = [(4 + )/(18 + )] q

D. Q = [(18 + )/(4 + )] q
2863. 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. Combined system

B. Partially combined system

C. None of these

D. Separate system

2864. Specific weight of water in S.I. units is equal to_________________?
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A. 1000 N/m3

B. 9.81 xlO3 N/m3

C. 9.81 N/m3

D. 10000 N/m3

E. 9.81 xlO6N/m3

2865. Poise is the unit of________________?
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A. buoyancy

B. shear stress in fluids

C. surface tension

D. viscosity

E. capillarity

2866. 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

2867. The coagulant widely used for sewage treatment, is_________________?
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A. Ferric sulphate

B. Alum

C. Chlorinated copperas

D. Ferric chloride
2868. The units of kinematic viscosity are_______________?
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A. none of the above

B. newton-sec per meter

C. kg sec/meter

D. metres2 per sec

E. newton-sec per meter

2869. If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity is__________________?
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A. 1 in 100

B. None of these

C. 1 in 60

D. 1 in 120

2870. Surface tension _____________________?
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A. decreases with fall in temperature

B. acts in the plane of the interface normal to any line in the surface

C. is a function of the curvature of the interface

D. has no units

E. is also known as capillarity

2871. Pick up the correct statement from the following?
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A. Manhole covers are made circular for the convenience of the cleaning staff

B. All the above

C. The boning rod is used for checking the levels of the sewer inverts

D. A manhole is classified as shallow manhole if its depth is less than 0.9 m

2872. House connections to the laterals is generally made by___________________?
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A. Cast iron

B. P.C.C.

C. Glazed stonewares

D. R.C.C.

2873. weight of water, the hydraulic mean depth of the sewer and the bed slope w is the unit of the sewer, then the tractive force exerted by flowing water, is________________________?
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A. w r1/2

B. w r S

C. w r2/3

D. w r S S
2874. The sewerage system originates from__________________?
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A. Lateral sewers

B. Branch sewers

C. Main sewers

D. House sewers
2875. For manometer, a better liquid combination is one having______________?
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A. lower surface tension

B. higher surface tension

C. surface tension is no criterion

D. high density and viscosity

E. low density and viscosity

2876. The most efficient cross section of sewers in a separate sewerage system is__________________?
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A. Rectangular

B. New egged

C. Circular

D. Parabolic

2877. A sewer running partially full and hurried with back filled, fails in compression due to_________________?
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A. All the above

B. Weight of the back fill

C. Superimposed traffic loads

D. Weight of the pipe

2878. A liquid compressed in cylinder has a volume of 0.04 m3 at 50 kg/cm2 and a volume of 0.039 m3 at 150 kg/cm2. The bulk modulus of elasticity of liquid is _________________?
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A. 400 kg/cm2

B. 40 x 105 kg/cm2

C. 4000 kg/cm2

D. 40 x 106 kg/cm2

E. none of the above

2879. Which of the following is dimensionless ________________?
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A. specific viscosity

B. specific weight

C. specific volume

D. specific speed

E. specific gravity
2880. If D.O. concentration falls down to zero in any natural drainage, it indicates the zone of__________________?
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A. Recovery

B. Degradation

C. Active decomposition

D. Cleaner water

2881. hydraulically equivalent, the relationship which holds good, is _______________?
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A. D8/3 = 4 b8/3

B. D3/8 = 4 b3/8

C. D2/3 = 4 b2/3

D. D3/2 = 4 b3/2

2882. The specific weight of water is 1000 kg/m _______________?
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A. all the above

B. at norma] pressure of 760 mm

C. at 4C temperature

D. none of the above.

E. at mean sea level

2883. The moisture content of sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is_______________?
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A. 25%

B. 50 %

C. 10%

D. 5%

2884. Liquids________________?
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A. are not affected by change in pressure and temperature

B. cannot be compressed

C. GO are not viscous

D. occupy definite volume

E. none of the above
2885. The bulk modulus of elasticity with increase in pressure___________________?
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A. unpredictable

B. increases

C. increases first upto certain limit and then decreases

D. decreases

E. remains constant

2886. In olden days the type of section adopted in trunk and out fall sewers was__________________?
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A. Circular shaped

B. Horse shoe shaped

C. Egg shaped

D. Parabolic shaped

2887. An inverted siphon is designed generally for____________________?
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A. One pipe

B. Three pipes

C. Two pipes

D. Four pipes

2888. To prevent settling down of sewage both at the bottom and on the sides of a large sewer, self-cleaning velocity recommended for Indian conditions, is_________________?
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A. 0.75 m/sec

B. 0.50 m/sec

C. 0.60 m/sec

D. 0.70 m/sec

2889. The center of gravity of the volume of the liquid displaced by an immersed body is called________________?
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A. center of gravity

B. center of pressure

C. meta-center

D. none of the above

E. center of buoyancy
2890. If is the diameter of upper circular portion, the area of cross-section of a standard egg shaped sewer, is____________________?
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A. D

B. D

C. D

D. D
2891. Pick up the correct statement from the following?
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A. Aerobic bacteria flourish in the presence of oxygen

B. Anaerobic bacteria flourish in the absence of oxygen

C. Facultative bacteria flourish with or without oxygen

D. . All the above
2892. Alcohol is used in manometer, because___________________?
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A. ose the wrong statement ?

2893. The rate of accumulation of sludge per person per year, is_______________________?
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A. 20 litres

B. 15 litres

C. 10 litres

D. 25 litres

2894. 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. 500 kg

B. 1000 kg

C. 1500 kg

D. 2000 kg

E. 4000 kg

2895. Stone ware pipes are_______________?
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A. Highly resistant to sulphide corrosion

B. Especially suited to pressure pipes

C. Hydraulically efficient because of their smooth interior surface

D. Highly impervious

2896. Imhoff cone is used to determine_____________________?
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A. None of these

B. Settleable solids

C. Dissolved solids

D. Suspended solids

2897. 5 days-biochemical oxygen demand (BOD5) is taken at a temperature of_________________?
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A. 20C

B. 25C

C. 15C

D. 0C

2898. The use of coarse screens for the disposal of sewage, may be dispensed with by______________?
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A. Comminutor

B. Shredder

C. Both A. and B.

D. Neither A. nor B.

2899. The factor responsible for purification of sewage in river is________________?
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A. Dissolved oxygen in water

B. All the above

C. Hydrology

D. Temperature

2900. The ratio of the diameter of a circular section and the side of a square section hydraulically equivalent, is____________________?
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A. 1.065

B. 1.075

C. 1.095

D. 1.085