civil engineering MCQs – Page 245

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 Review each marked answer and report any item that may be outdated or unclear.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

4881. 15 cumecs, the depth d and width are related by For drains up to___________________?
0

A. B = 0.5 d

B. d = 0.2 B

C. B = 0.2 d

D. d = 0.5 B

4882. The density of population over 40 hectares is 250/hectare. If water supply demand per day is 200 litres and sewage discharge is 80% of water supply, the sewage flow in sewers of separate system, is_____________________?
0

A. 0.05556 cumec

B. 0.05554 cumec

C. 0.0556 cumec

D. 0.05552 cumec

4883. In trickling filter, B.O.D. is reduced to___________________?
0

A. 40 to 60%

B. 30 to 40%

C. 60 to 80%

D. 80 to 90%

4884. The coagulant widely used for sewage treatment, is_________________?
0

A. Ferric sulphate

B. Ferric chloride

C. Chlorinated copperas

D. Alum

4885. The rate of accumulation of sludge in septic tanks is recommended as____________________?
0

A. 25 litres/person/year

B. 30 litres/person/month

C. 30 litres/person/year

D. 25 litres/person/month

4886. The maximum diameter of sewers adopted in the designs is_______________?
0

A. 4.0 m

B. 2.0 m

C. 1.0 m

D. 3.0 m

4887. For laying a sewer line in a trench of 2 m width, an offset line is marked on the ground parallel to the given centre line at a distance of___________________?
0

A. 160 cm

B. 140 cm

C. 100 cm

D. 120 cm

4888. Before discharging the foul sewage into rivers, it is generally treated by_____________________?
0

A. All the above

B. Screening

C. Sedimentation

D. Oxidation

4889. For sewers, inverted siphon is provided for___________________?
0

A. One pipe

B. Three pipes

C. Two pipes

D. Four pipes

4890. If the diameter of sewer is 225 mm, the gradient required for generating self cleansing velocity, is___________________?
0

A. 1 in 100

B. 1 in 60

C. None of these

D. 1 in 120

4891. The flow velocity in detritus tanks is________________?
0

A. 0.05 m/sec

B. 0.09 m/sec

C. None of these

D. 1.25 m/sec

4892. The ratio of maximum sewage flow to average sewage flow for mains up to 1 m in diameter, is___________________?
0

A. 2.0

B. 1.5

C. 4

D. 3

4893. For evaporation and measurement of settable solids, the apparatus used, is________________?
0

A. A test tube

B. A breaker

C. A jar

D. An Imhoff cone

4894. The sewer pipes__________________?
0

A. All the above

B. Are designed for generating self-cleansing velocities at different discharge

C. Carry sewage as gravity conduits

D. Should resist the wear and tear caused due to abrasion

4895. The most effective arrangement for diverting excess storm water into a natural drainage, is____________________?
0

A. None of these

B. Overflow weir

C. Leaping weir

D. Siphon spill way

4896. Removal of oil and grease from sewage, is known____________________?
0

A. Screening

B. None of these

C. Filtration

D. Skimming

4897. Assertion A.: The minimum self cleansing velocity in the sewer, at least once a day, must be generated. Reason (R): If certain deposition takes place and is not removed, it obstructs free flow and causes further deposition leading to complete blocking of the sewer?
0

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

4898. In very first stage of decomposition of the organic matter in sewage________________?
0

A. Nitrites are formed

B. Nitrates are formed

C. Ammonia is formed

D. Carbondioxide is formed

4899. Pathogens (or pathogenic bacterias) in water may cause___________________?
0

A. Dysentery

B. Typhoid

C. Cholera

D. All the above

4900. A nuisance is experienced in diluting water if dilution factor is less than_________________?
0

A. 60

B. 40

C. 20

D. 100

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