civil engineering MCQs – Page 194

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 Review each marked answer and report any item that may be outdated or unclear.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
3861. Sunlight_________________ ?
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A. impedes growth of algae

B. reduces turbidity

C. increases dissolved oxygen content

D. helps growth of bacterias

3862. Corrosion of well pipes may not be reduced by_________________?
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A. using thicker pipes

B. reducing the draw down and the pumping rate

C. using screens having larger area of openings

D. reducing the flow velocity

E. none of these

3863. Acidity in water is caused due to_______________?
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A. Iron sulphate

B. All the above

C. Free CO2

D. Aluminium sulphate

E. Mineral acids

3864. In slow sland filters, the turbidity of raw water can be removed only up to_________________?
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A. 150 mg/litre

B. 75 mg/litre

C. 100 gm/litre

D. 60 mg/litre
3865. The R.L. of ground water table on the sides of a valley is 1505 m whereas R.L. of the stream water is 1475 m. If 60 slope consists of pervious soil between R.L. 1485 m to 1500 m, the gravity spring may be expected at the point of reduced level_______________?
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A. 1475 m

B. 1485 m

C. 1505 m

D. 1500 m

3866. If four fires break out in a city of population 40 lakhs and if each hydrant has three streams and duration of each fire is four hours, the total quantity of water required, is______________________?
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A. 1880 kilo litres

B. 3880 kilo litres

C. 2880 kilo litres

D. 4880 kilo litres

3867. Biochemical Oxygen Demand (B.O.D.) of safe drinking water must be________________?
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A. 15

B. nil

C. 20

D. 5

E. 10

3868. The least thickness of class B cast iron (spun) pipe, is_________________?
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A. 8.6 mm

B. 7.2 mm

C. 10 mm

D. 7.9 mm

3869. The maximum depth of sedimentation tanks is limited to________________?
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A. 2 m

B. 5 m

C. 3 m

D. 6 m

E. 4 m

3870. Asbestos pipes are ______________?
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A. highly resistant to corrosion

B. light in weight and easy to transport

C. very much smooth and hydraulically efficient

D. high flexible to accommodate deflection upto 12

E. all the above
3871. Time of concentration________________?
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A. is the time taken, for precipitation

B. duration of rainfall.

C. time taken for all the ran off to reach the drain

D. time taken for the storm water to travel from the most remote point to the drain
3872. According to IS : 1172-1963, a minimum of 135 litres of water capita per day, is required for________________?
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A. Nurses home and medical quarters

B. Boarding schools

C. all the above

D. hostels

3873. The factor affecting per capita demand, is___________________?
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A. all the above

B. pressure in water mains

C. cost of water

D. size of the city

E. climatic conditions

3874. Disinfection of drinking water, is done to remove_________________?
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A. bacterias

B. turbidity

C. colour

D. odour

3875. The specific retention is least in case of_______________?
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A. Sand

B. Coarse gravel

C. Clay

D. Silt

3876. Aeration of water is done to remove______________?
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A. turbidity

B. odour

C. colour

D. hardness

E. bacterias

3877. The yield of a rapid gravity filter as compared to that of slow sand filter, is__________________?
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A. 20 times

B. 15 times

C. 35 times

D. 30 times

E. 10 times

3878. In distribution pipes, drain valves are provided at_______________?
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A. higher point

B. lower point

C. any where

D. junction points

3879. The fire demand of a city may be worked out by _________________?
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A. Bustans formula

B. Kuichlings formula

C. Under Writers formula

D. Freeman formula

E. All the above.
3880. As per IS : 1172-1963, water required per head per day for average domestic purposes, is_______________?
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A. 65 litres

B. 135 litres

C. 50 litres

D. 85 litres

E. 105 litres