civil engineering MCQs – Page 144

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 Review each marked answer and report any item that may be outdated or unclear.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
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