civil engineering MCQs – Page 254

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 Review each marked answer and report any item that may be outdated or unclear.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
5061. Boussinesqs equation for ascertaining unit pressure at a depth on sewers due to traffic loads, is__________________?
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A. pt = 2 3p/3Z5

B. pt = 3H3p/2Z5

C. pt = 3H3p/2 Z5

D. pt = 2H3p/3 Z5

5062. If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is___________________?
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A. 2 hours

B. 4 hours

C. 6 hours

D. 8 hours
5063. The angle subtended by the surface of sewer water with partial flow, at sewer centre is 120, the depth of sewerage is________________________?
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A. 25 cm

B. 40 cm

C. 20 cm

D. 50 cm
5064. As compared to fresh river water, sea water contains oxygen_________________?
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A. 10% less

B. 20% more

C. 20% less

D. 10% more

5065. You are asked to design sewer pipes of diameters 0.4 m to 0.9 m at maximum flow, you will assume the sewer flow running at___________________?
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A. Three fourth full

B. Full depth

C. Half full

D. Two third full

5066. Kjeldahl nitrogen is a mixture of___________________?
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A. All the above

B. Ammonia and nitrogen

C. Nitrogen and organic nitrogen

D. Organic nitrogen and ammonia

5067. Assertion A. : Discharging the effluents from the oxidation ponds just up stream of lakes or reservoirs is undesirable. Reason (R) : The discharged algae get settled in the reservoirs and cause anaerobic decomposition and other water qualities_________________?
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A. Both A and R are true and R is the correct explanation of A

B. Both A and R are true but R is not a correct explanation of A

C. A is true but R is false

D. A is false but R is true

5068. are available in size Stoneware sewers________________?
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A. All the above

B. 10 cm

C. 20 cm

D. 15 cm

5069. The sewage treatment in septic tanks is due to__________________?
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A. Aerobic decomposition

B. None of these

C. Parasitic decomposition

D. Anaerobic decomposition
5070. The water carried sewerage system removes__________________?
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A. Domestic sewage

B. Storm sewage

C. Industrial sewage

D. All the above
5071. Sludge banks are formed if sewage is disposed of in____________________ ?
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A. Seas

B. Lakes

C. Rivers

D. None of these

5072. The intensity of rain is expressed in________________?
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A. cm/minute

B. None of these

C. cm/hour

D. cm/day

5073. The drop man holes are generally provided in sewers for____________________?
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A. Hilly town ships

B. Industrial areas

C. Large town ships

D. Cities in plains

5074. 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. Bazin

B. Kutter

C. Manning

D. Chezy

5075. For providing an Indian type W.C., the R.C.C. slabs in the toilet portion__________________?
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A. Should be sunk by 50 cm

B. Should be sunk by 20 cm

C. Should be kept 20 cm above the adjacent portion

D. Need not be sunk

5076. The bottom of the sewage inlet chamber of septic tanks, is provided an outward slope_________________?
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A. 1 in 15

B. 1 in 20

C. 1 in 5

D. 1 in 10
5077. Assertion A.: A free board of 0.3 m is provided above the top sewage line in septic tanks. Reason (R): It helps to accommodate the scum in the septic tank_________________?
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A. Both A and R is true and R is the correct explanation of A

B. Both A and R is true but R is not a correct explanation of A

C. A is true but R is false

D. A is false but R is true

5078. The quantity of liquid waste which flows in sewers during the period of rainfall, is known__________________?
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A. Sanitary sewage

B. None of these

C. Industrial waste

D. Storm sewage
5079. When drainage to sewage ratio is 20, the peak dry weather flow is_______________?
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A. 20% of the design discharge

B. Slightly less than 5% of the design discharge

C. None of these

D. Slightly more than 5% of the design discharge

5080. 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