civil engineering MCQs – Page 244

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 Review each marked answer and report any item that may be outdated or unclear.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
4861. No treatment of the sewage is given if dilution factor is_____________?
comments icon0
A. More than 500

B. Less than 150

C. Between 200 to 300

D. Between 150 to 200

4862. th or th extra space is left in sewer pipes at maximum discharge for_________________?
comments icon0

A. Unexpected increase in population

B. Low estimates of the average and maximum flows

C. Large scale infiltration of storm water

D. All the above
4863. The rational formula for peak drainage discharge, was evolved by_________________?
comments icon0

A. Fruhling

B. Kuichling

C. All of these

D. Lloyd David

4864. The rainfall at any place may be determined by__________________?
comments icon0

A. Its intensity

B. All the above

C. Its direction

D. Its frequency

4865. The coagulant which is generally not used for treating the sewage, is__________________?
comments icon0

A. Ferric chloride

B. Ferric sulphate

C. Chlorinated copperas

D. Alum
4866. Bottom openings 15 cm 15 cm in the standing baffle wall are provided________________?
comments icon0
A. 22.5 cm c/c

B. 15 cm c/c

C. 50 cm c/c

D. 30 cm c/c

4867. If the flame of a miners safety lamp in the upper layers of the sewer forms an explosive, the sewer certainly contains_______________?
comments icon0
A. Methane

B. Hydrogen sulphide

C. Carbon dioxide

D. Oxygen

4868. The Chezys constant C in the formula V = C_________________?
comments icon0

A. Shape of the sewer

B. Roughness of sewer surface

C. Size of the sewer

D. All the above
4869. Pick up the correct statement from the following ?
comments icon0

A. Rate of digestion of sludge is more at higher temperature

B. Thermophilic organisms digest the sludge if the temperature ranges from 40 to 60C

C. Mesophilic organisms digest the sludge if the temperature is between 25 and 40C

D. All the above
4870. Traps_________________?
comments icon0

A. Dissolve the foul gases

B. Create symphonic action to increase the quick disposal of sewerage

C. Are used to trap the rats entering sewers

D. Are water seals which prevent the entry of foul gases
4871. 1000 kg of sewage contains________________?
comments icon0

A. 0.112 kg in suspension

B. 0.112 kg in solution

C. 0.225 kg in solution

D. Both A. and C. of above
4872. For efficient working of a sewer, it must be ensured that _____________?
comments icon0

A. Minimum velocity of 0.45 m/sec, is maintained at its minimum flow

B. A maximum velocity of 0.90 m/sec, is maintained at its maximum flow

C. Both A. and B.

D. Neither A. nor B.

4873. Assertion A.: The determination of pH value of sewerage is important. Reason (R): The efficiency of certain treatment methods depends upon the availability of pH value________________?
comments icon0
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

4874. Aerobic bacterias___________________?
comments icon0

A. Consume organic matter as their food

B. Oxidise organic matter in sewage

C. All the above

D. Flourish in the presence of free oxygen

4875. For the open drain (N = 0.025) shown in the below figure, the discharge is________________?
comments icon0
A. 28.88 cumecs

B. 29.88 cumecs

C. 26.88 cumecs

D. 27.88 cumecs

4876. Pick up the correct statement from the following ?
comments icon0
A. All the above

B. The sewer pipes of sizes greater than 0.4 m diameter are designed as running 2/3rd or 3/4th full at maximum discharge

C. The minimum design velocity of sewer pipes is taken as 0.8 m/sec

D. The sewer pipes of sizes less than 0.4 m diameter are designed as running full at maximum discharge

4877. The sludge does not contain waste water from_________________?
comments icon0

A. Wash basins

B. Bath rooms

C. Toilets

D. Kitchen sinks

4878. The porosity of sediments in sewer pipes, is usually taken as___________________?
comments icon0

A. 0.01

B. 0.011

C. 0.013

D. 0.012

4879. For detecting the nitrates in sewage, the colour may be developed by adding________________?
comments icon0

A. None of these

B. Potassium permanganate

C. Phenol-di -sulphuric acid and potassium hydroxide

D. Sulphuric acid and napthamine

4880. For house drainage minimum gradient is__________________?
comments icon0
A. 1 in 60

B. 1 in 80

C. 1 in 10

D. 1 in 400