civil engineering MCQs – Page 253

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 Review each marked answer and report any item that may be outdated or unclear.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

5041. The temperature affects the________________?
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A. Solubility of gases in sewage

B. Viscosity of sewage

C. Biological activity of bacteria in sewage

D. All the above

5042. The detention time (t) of a settling tank, may be defined as the time required for_________________?
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A. A particle to travel from top surface to bottom sludge zone

B. A particle to travel along its length

C. None of these

D. The flow of sewage to fill the tank

5043. Cement concrete sewers are only suitable if non-scouring velocity is between_________________?
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A. 2.5 to 3.0 m/sec

B. 4.5 to 5.5 m/sec

C. 3.0 to 4.0 m/sec

D. 3.5 to 4.5 m/sec

5044. If 2% solution of a sewage sample is incubated for 5 days at 20C and depletion of oxygen was found to be 5 ppm, B.O.D. of the sewage is____________________?
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A. None of these

B. 225 ppm

C. 250 ppm

D. 200 ppm

5045. To maintain aerobic biological activity, the moisture content of the compost mass should be about_________________?
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A. 50%

B. 60%

C. 55 %

D. 45%

5046. A cylindrical ejector having its height 2 m fills after every 10 minutes with a peak sewage discharge of 0.0157 cumec. The diameter of the ejector chamber, is_____________________?
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A. 2.30 m

B. 2.40 m

C. 2.45 m

D. 2.50 m

5047. The sewer which transports the sewage to the point of treatment, is called________________?
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A. Main sewer

B. House sewer

C. Out-fall sewer

D. Branch sewer

5048. The pH value of sewage is determined with the help of_________________?
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A. Imhoff Cone

B. Potentiometer

C. None of these

D. Turbid meter

5049. For trunk sewers more than 1.25 m in diameter, the ratio of the maximum daily sewage flow to the average daily sewage flow is assumed________________?
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A. 2

B. 2.5

C. 1.5

D. 3

5050. The pH value of fresh sewage is usually ______________________?
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A. Equal to zero

B. Equal to 7

C. More than 7

D. Less than 7

5051. Which one of the following part of human body withstands minimum radiation ?
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A. Kidneys

B. Thyroid

C. Ovaries/testis

D. Eyes

5052. The asbestos cement pipes are generally laid___________________?
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A. At an angle of 30

B. At an angle of 60

C. Vertically

D. Horizontally

5053. A sewer pipe contains 1 mm sand particles of specific gravity 2.65 and 5 mm organic particles of specific gravity 1.2, the minimum velocity required for removing the sewerage, is_____________________?
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A. 0.30 m/sec

B. 0.40 m/sec

C. 0.35 m/sec

D. 0.45 m/sec

5054. The first stage of neutral process of sludge digestion, is__________________?
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A. Acid fermentation

B. None of these

C. Acid regressio

D. Alkaline fermentation

5055. In sewage having fully oxidised organic matter, the nitrogen exists in the form of________________?
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A. Aluminoid nitrogen

B. Nitrates

C. Free ammonia

D. Nitrites

5056. The rate of accumulation of sludge per person per year, is_______________________?
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A. 15 litres

B. 20 litres

C. 10 litres

D. 25 litres

5057. 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 r S S

B. w r1/2

C. w r S

D. w r2/3

5058. The digested sludge from septic tanks, is removed after a maximum period of__________________?
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A. 3 years

B. 4 years

C. 5 years

D. 3.5 years

5059. For non-scouring velocity 5 m/sec, the type of sewers generally preferred to, is____________________?
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A. Cast iron sewers

B. Glazed bricks sewers

C. Stone ware sewers

D. Cement concrete sewers

5060. The design period in years for pumping plants, is___________________?
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A. 5 to 10

B. 3 to 5

C. 2 to 3

D. 1

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