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MCQs

Total Questions : 1556 | Page 8 of 156 pages
Question 71. Pick up the incorrect statement from the following:
  1.    Manholes are provided in sewer pipes at suitable intervals
  2.    Catch basins are generally provided in sewers for carrying drainage discharge
  3.    Inlets are generally provided in all sewers
  4.    None of these
 Discuss Question
Answer: Option C. -> Inlets are generally provided in all sewers
Question 72. Pick up the correct statement from the following:
  1.    pH value indicates acidity and alkalinity of sewage
  2.    In acidic sewage, the pH value is less than 7
  3.    In alkaline sewage, the pH value is more than 7
  4.    All the above
 Discuss Question
Answer: Option D. -> All the above
Question 73. The most efficient cross section of sewers in a separate sewerage system is
  1.    Parabolic
  2.    Circular
  3.    Rectangular
  4.    New egged
 Discuss Question
Answer: Option B. -> Circular
Question 74. The minimum diameter of a sewer is kept
  1.    10 cm
  2.    15 cm
  3.    20 cm
  4.    25 cm
 Discuss Question
Answer: Option B. -> 15 cm
Question 75. The most efficient cross-section of sewers in a combined sewerage system is
  1.    Parabolic
  2.    Circular
  3.    Rectangular
  4.    New egged
 Discuss Question
Answer: Option B. -> Circular
Question 76. 3.0 ml of raw sewage is diluted to 300 ml. The D.O. concentration of the diluted sample at the beginning of the test was 8 mg/l. After 5 day-incubation at 20°C, the D.O. concentration was 5 mg/l. The BOD of raw sewerage is
  1.    100 mg/l
  2.    200 mg/l
  3.    300 mg/l
  4.    400 mg/l
 Discuss Question
Answer: Option C. -> 300 mg/l
Question 77. 1000 kg of sewage contains
  1.    0.112 kg in suspension
  2.    0.112 kg in solution
  3.    0.225 kg in solution
  4.    Both A and C of above
 Discuss Question
Answer: Option D. -> Both A and C of above
Question 78. Water content of sewage is about
  1.    90 %
  2.    95 %
  3.    99 %
  4.    99.9 %
 Discuss Question
Answer: Option D. -> 99.9 %
Question 79. The ratio of minimum hourly flow to the average flow of sewage is
  1.    1/4
  2.    1/3
  3.    1/2
  4.    3/4
 Discuss Question
Answer: Option B. -> 1/3
Question 80. A circular sewer section is preferred to because
  1.    It is cheaper in construction
  2.    It provides maximum area for a given perimeter
  3.    It provides maximum hydraulic mean depth
  4.    All the above
 Discuss Question
Answer: Option D. -> All the above

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