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MCQs

Total Questions : 828 | Page 5 of 83 pages
Question 41. The minimum and maximum diameters of sewers shall preferably be
  1.    15 cm and 100 cm
  2.    15 cm and 300 cm
  3.    30 cm and 450 cm
  4.    60 cm and 300 cm
 Discuss Question
Answer: Option B. -> 15 cm and 300 cm
Question 42. Sewerage system is usually designed for
  1.    10 years
  2.    25 years
  3.    50 years
  4.    75 years
 Discuss Question
Answer: Option B. -> 25 years
Question 43. The biochemical treatment of sewage effluents is essentially a process of
  1.    Oxidation
  2.    Dehydration
  3.    Reduction
  4.    Alkalinization
 Discuss Question
Answer: Option A. -> Oxidation
Question 44. Sewage treatment units are normally designed for
  1.    5 - 10 years
  2.    15 - 20 years
  3.    30 - 40 years
  4.    40 - 50 years
 Discuss Question
Answer: Option B. -> 15 - 20 years
Question 45. Generally the detention period for grit chambers is kept as
  1.    1 minute
  2.    5 minutes
  3.    24 hours
  4.    12 hours
 Discuss Question
Answer: Option A. -> 1 minute
Question 46. Activated carbon is used for
  1.    Disinfection
  2.    Removing hardness
  3.    Removing odours
  4.    Removing corrosiveness
 Discuss Question
Answer: Option C. -> Removing odours
Question 47. In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20°C. The BOD of raw sewage will be
  1.    100 ppm
  2.    200 ppm
  3.    300 ppm
  4.    400 ppm
 Discuss Question
Answer: Option B. -> 200 ppm
Question 48. The polluted water is one which
  1.    Contains pathogenic bacteria
  2.    Consists of undesirable substances rendering it unfit for drinking and domestic use
  3.    Is safe and suitable for drinking and domestic use
  4.    Is contaminated
 Discuss Question
Answer: Option B. -> Consists of undesirable substances rendering it unfit for drinking and domestic use
Question 49. The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about
  1.    0.01 to 0.05 ppm
  2.    0.05 to 0.5 ppm
  3.    0.5 to 1.0 ppm
  4.    1.0 to 5.0 ppm
 Discuss Question
Answer: Option B. -> 0.05 to 0.5 ppm
Question 50. Which of the following retards the self purification of stream?
  1.    Higher temperature
  2.    Sunlight
  3.    Satisfying oxygen demand
  4.    None of the above
 Discuss Question
Answer: Option D. -> None of the above

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