civil engineering MCQs – Page 252

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 Review each marked answer and report any item that may be outdated or unclear.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
5021. Which one of the following tests is used for testing sewer pipes ?
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A. Water test

B. All of these

C. Mirror test

D. Ball test

5022. In sewage, the solids in mg per litre is__________________?
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A. 1500 to 2000

B. 1000 to 1500

C. 500 to 1000

D. 100 to 500

5023. Pick up the in-correct statement from the following?
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A. Inlets are generally provided in all sewers

B. Catch basins are generally provided in sewers for carrying drainage discharge

C. Manholes are provided in sewer pipes at suitable intervals

D. None of these

5024. Maximum permissible velocity 1.5 m/sec, is adopted in drains_______________________?
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A. With beds of rocks and gravels

B. Lined with stones

C. Both A. and B.

D. Neither A. nor B.

5025. The sewer pipe which carries sewage from a building for immediate disposal is______________?
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A. Main sewer

B. Intercepting sewer

C. House sewer

D. Lateral sewer

5026. Which one of the following resists hydrogen sulphide corrosion ?
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A. Glazed stone wares

B. Asbestos cement

C. R.C.C.

D. Glazed ware
5027. The minimum diameter of sewer to be adopted is_________________?
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A. 25 cm

B. 15 cm

C. 12.5 cm

D. 10 cm

5028. The following is the physical characteristic of sewage___________________?
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A. Turbidity

B. All the above

C. Colour

D. Odour

5029. Self-cleansing velocity is__________________?
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A. Velocity at dry weather flow

B. Velocity of water at flushing

C. Velocity of water in a pressure filter

D. Velocity at which no accumulation remains in the drains
5030. For design of sewers, percentage of sewage discharge is assumed_____________________?
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A. 75 to 80%

B. 70 to 75%

C. 65 to 70%

D. 85%

5031. Imhoff cone is used to determine_____________________?
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A. None of these

B. Suspended solids

C. Settleable solids

D. Dissolved solids

5032. Pick up the correct statement from the following ?
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A. Sewers are designed for minimum permissible velocity at minimum flow

B. Maximum daily flow = average daily flow

C. All the above

D. Maximum daily flow = 2 times the average daily flow

5033. The width of a rectangular sewer is twice its depth while discharging 1.5 m/sec. The width of the sewer is______________?
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A. 1.36 m

B. 1.76 m

C. 0.68 m

D. 0.88 m

5034. The spacing of man holes along a straight portion of a sewer is 300 m, the diameter of the sewer may be__________________?
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A. > 1.5 m

B. 0.9 cm

C. 1.5 m

D. 1.2 m

5035. In Chezys formula V = C rs for calculating the velocity of flow in circular sewer of diameter running full, the value of hydraulic mean radius is_______________?
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A. D /2

B. D/3

C. D/4

D. D

5036. The grit chambers of sewage treatment plants, are generally cleaned after__________________?
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A. 12 days

B. 14 days

C. 7 days

D. 2 days

5037. The settlement velocity of a solid (diameter 0.5 mm, specific gravity 1.75) in water having temperature 10C, is______________________?
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A. 413.5 cm/sec

B. 500 cm/sec

C. 313.5 cm/sec

D. 213.5 cm/sec

5038. hydraulically equivalent, the relationship which holds good, is _______________?
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A. D3/2 = 4 b3/2

B. D8/3 = 4 b8/3

C. D3/8 = 4 b3/8

D. D2/3 = 4 b2/3

5039. Aerobic activity is maximum_______________?
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A. None of these

B. In sewer treatment plants

C. At sewer pipes

D. In freshly produced sewage
5040. If the grit in grit chambers is 4.5 million litres per day, its cleaning is done____________________?
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A. Mechanically

B. Manually

C. Hydraulically

D. Electrically