civil engineering MCQs – Page 147

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 Review each marked answer and report any item that may be outdated or unclear.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
2921. As compared to fresh river water, sea water contains oxygen_________________?
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A. 10% more

B. 20% less

C. 20% more

D. 10% less

2922. In a sedimentation tank (length L, width B, depth D) the settling velocity of a particle for a discharge Q, is____________________?
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A. Q/(L D)

B. Q/(B L)

C. Q/L

D. Q/(B D)

2923. In areas where rainy season is limited to a few months, the type of sewerage system recommended is__________________?
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A. Partially separate system

B. None of these

C. Separate system

D. Combined system

2924. If D is the diameter of a circular sewer and D is the top horizontal diameter of an equivalent egg shaped section, the relationship which holds good, is_______________?
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A. D = 0.64 D

B. D = 0.84 D

C. D = 0.94 D

D. D = 0.74 D

2925. In a static fluid__________________?
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A. viscosity is nil

B. only normal stresses can exist

C. fluid pressure is zero

D. linear deformation is small

E. resistance to shear stress is small

2926. The most efficient cross-section of sewers in a combined sewerage system is________________?
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A. Rectangular

B. New egged

C. Circular

D. Parabolic

2927. The reduced levels of the string at the consecutive sight rails A and B are 203.575 m, 203.475 m respectively. If the difference of their R.D.s is 10 m, the gradient of the sewer line is_________________?
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A. 1 in 503 upward

B. 1 in 100 downward

C. 1 in 100 upward

D. 1 in 500 upward

2928. The value of the coefficient of compressibility for water at ordinary pressure and temperature in kg/cm is equal to _________________?
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A. 10,000

B. 1000

C. 2700

D. 21,000.

E. 2100

2929. The density of water is 1000 kg/m3 at __________________?
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A. 0C

B. all temperature

C. 4C D. 20C

D. 0K

2930. In a city the ratio of the drainage to sewage is 20, the percentage discharge passing through non-monsoon periods, is_____________________?
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A. 5

B. 20

C. 10

D. 15

2931. Pick up the incorrect statement from the following?
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A. The mixture of water and waste products, is called sewage

B. The treated sewage effluents, are generally used for irrigating the crops

C. The process of collecting, treating and disposing off the sewage, is called sewerage

D. The old convergence system was definitely better than water carried sewerage system
2932. If w is the specific weight of liquid and k the depth of any point from the surface, then pressure intensity at that point will be____________________?
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A. w/h

B. h/w

C. h

D. h/wh

E. wh
2933. The tendency of a liquid surface to contract is due to the following property_________________?
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A. elasticity

B. cohesion

C. adhesion

D. surface tension

E. viscosity

2934. In sewers designed with self cleansing velocity________________?
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A. The bottom is silted

B. The bottom is scoured

C. Both silting and scouring occur at the bottom

D. Neither silting nor scouring occurs at the bottom
2935. If cohesion between molecules of a fluid is greater than adhesion between fluid and glass, then the free level of fluid in a dipped glass tube will be_________________?
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A. lower than the surface of liquid

B. the same as the surface of liquid

C. higher than the surface of liquid

D. unpredictable

E. none of the above

2936. Rate of flow of sewage is generally assumed__________________?
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A. Equal to the rate of water supply

B. Less than the rate of water supply

C. More than the rate of water supply

D. At 150 litres per capita
2937. The value of mass density in kgsecVm4 for water at 0C is_______________?
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A. 1

B. 1000

C. 91

D. 100

E. 101.9
2938. Dried sewage after treatment is used as____________________?
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A. Chemical for lowering B.O.D.

B. Building material

C. Fertilizer

D. Base material for paints

2939. A liquid would wet the solid, if adhesion forces as compared to cohesion forces are_________________?
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A. less at low temperature and more at high temperature

B. there is no such criterion

C. less

D. more

E. equal

2940. For detecting the nitrites in the sewage, the matching colour may be developed by adding_________________?
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A. Sulphuric acid and napthamine

B. None of these

C. Potassium permanganate

D. Phenol-di -sulphuric acid potassium hydroxide