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MCQs

Total Questions : 1556 | Page 3 of 156 pages
Question 21. If q is the average sewage flow from a city of population P, the maximum sewage flow
  1.    Q = [(4 + )/(18 + )] q
  2.    Q = [(18 + P)/(4 + )] q
  3.    Q = [(18 + )/(4 + )] q
  4.    Q = [(5 + )/((15 + )] q
 Discuss Question
Answer: Option C. -> Q = [(18 + )/(4 + )] q
Question 22. Fresh sewage may become stale in
  1.    One hour
  2.    Two to three hours
  3.    Three to four hours
  4.    Six hours
 Discuss Question
Answer: Option C. -> Three to four hours
Question 23. The grit and silt of the grit chambers, may not be used for
  1.    Raising low lying areas by dumping
  2.    Concreting
  3.    Both A and B
  4.    Neither A nor B
 Discuss Question
Answer: Option B. -> Concreting
Question 24. When drainage to sewage ratio is 20, the peak dry weather flow is
  1.    20% of the design discharge
  2.    Slightly less than 5% of the design discharge
  3.    Slightly more than 5% of the design discharge
  4.    None of these
 Discuss Question
Answer: Option B. -> Slightly less than 5% of the design discharge
Question 25. The sewerage system consists of
  1.    House sewer
  2.    Lateral sewer
  3.    Branch sewer
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 26. Discrete or granular particles change their
  1.    Size
  2.    Shape
  3.    Weight
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
Question 27. The suitable cross-section of sewers to carry combined flow, is
  1.    Circular
  2.    Egg shaped
  3.    Rectangular
  4.    Horse shoe shaped
 Discuss Question
Answer: Option B. -> Egg shaped
Question 28. Facultative bacteria survive in
  1.    The presence of oxygen
  2.    The absence of oxygen
  3.    Both cases A and B
  4.    Neither A nor B
 Discuss Question
Answer: Option C. -> Both cases A and B
Question 29. The width of a settling tank with 2 hour detention period for treating sewage 378 cu m per hour, is
  1.    5 m
  2.    5.5 m
  3.    6.5 m
  4.    7 m
 Discuss Question
Answer: Option D. -> 7 m
Question 30. A nuisance is experienced in diluting water if dilution factor is less than
  1.    100
  2.    60
  3.    40
  4.    20
 Discuss Question
Answer: Option D. -> 20

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