civil engineering MCQs – Page 257

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 Review each marked answer and report any item that may be outdated or unclear.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

5121. Lead acetate test in sewer manhole is done to test the presence of ____________________?
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A. Diesel vapours

B. Hydrogen sulphide

C. Carbondioxide gas

D. Methane gas

5122. The maximum depth of sedimentation tanks, is kept__________________?
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A. 3 m

B. 3.5 m

C. 4.5 m

D. 4 m

5123. The ratio of the diameter of a circular section and the side of a square section hydraulically equivalent, is____________________?
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A. 1.085

B. 1.095

C. 1.075

D. 1.065

5124. The factor responsible for purification of sewage in river is________________?
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A. Dissolved oxygen in water

B. All the above

C. Hydrology

D. Temperature

5125. A five day B.O.D. at 15C of the sewage of a town is 100 kg/day. If the 5 day B.O.D. per head at 15C for standard sewage is 0.1 kg/day, the population equivalent is____________________?
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A. 1000

B. 10000

C. 100

D. 5000

5126. Sewer pipes need be checked for_________________?
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A. Minimum flow

B. Maximum flow

C. Both A. and B.

D. None of these

5127. The minimum diameter of a sewer is kept __________________?
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A. 25 cm

B. 15 cm

C. 10 cm

D. 20 cm

5128. The width of a settling tank with 2 hour detention period for treating sewage 378 cu m per hour, is __________________?
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A. 6.5 m

B. 7 m

C. 5 m

D. 5.5 m

5129. If the depth of flow in a circular sewer is 1/4th of its diameter D, the wetted perimeter is______________?
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A. /2

B. D

C. /3

D. /4

5130. Imhoff cone is used to measure________________?
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A. Total organic solids

B. Settleable solids

C. Total solids

D. Total in organic solids

5131. 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/(B D)

B. Q/(B L)

C. Q/(L D)

D. Q/L

5132. The grit and silt of the grit chambers, may not be used for_________________?
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A. Raising low lying areas by dumping

B. Concreting

C. Both A. and B.

D. Neither A. nor B

5133. For the COD test of sewage, organic matter is oxidised by K2Cr2O7 in the presence of________________?
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A. HCl

B. H2SO4

C. HNO3

D. None of these

5134. The sewer that unloads the sewage at the point of treatment is called_________________?
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A. Outfall sewer

B. Main sewer

C. Branch sewer

D. House sewer

5135. If the flame of a miners safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains_______________?
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A. Hydrogen sulphide

B. Carbon dioxide

C. Oxygen

D. Methane

5136. Pick up the correct statement from the following?
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A. All the above

B. Inlets are provided on the road surface at the lowest point for draining rain water

C. Inlets having horizontal openings, are called horizontal inlets

D. Inlets are generally provided at an interval of 30 m to 60 m along straight roads

5137. Sewer pipes are designed for maximum discharge with 25% to 33% vacant cross-sectional area for__________________?
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A. Unexpected increase in the population

B. Unexpected large scale infiltration of stream water

C. All of the above

D. Under estimates of maximum and average flows

5138. The layers of vegetable wastes and night soil alternatively piled above the ground to form a mound, is called_______________?
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A. A heap

B. Windrow

C. Plateau

D. None of these

5139. Sewer ventilating columns are generally placed at_______________?
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A. All the above

B. Every change in the size of sewers

C. Upper ends of branch sewers

D. Distances 150 m to 300 m

5140. For a grit chamber, if the recommended velocity of flow is 0.2 m/sec and detention period is 2 minutes, the length of the tank, is__________________?
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A. 30 m

B. 20 m

C. 24 m

D. 16 m

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