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MCQs

Total Questions : 828 | Page 6 of 83 pages
Question 51. The amount of coagulant needed for coagulation of water increases with (i) Increase in turbidity of water (ii) Decrease in turbidity of water (iii) Increase in temperature of water (iv) Decrease in temperature of waterThe correct answer is
  1.    (i) and (ii)
  2.    (i)and(iv)
  3.    (ii) and (iii)
  4.    (ii) and (iv)
 Discuss Question
Answer: Option B. -> (i)and(iv)
Question 52. As compared to rapid sand filters, slow sand filters give (i) Slower filtration rate (ii) Higher filtration rate (iii) Lesser efficiency in removal of bacteria (iv) Higher efficiency in removal of bacteria The correct answer is
  1.    (i) and (ii)
  2.    (ii) and (iii)
  3.    (i) and (iv)
  4.    (ii) and (iv)
 Discuss Question
Answer: Option C. -> (i) and (iv)
Question 53. Cleaning is done by (i) Scraping and removal in filters slow sand (ii) Back washing in slow sand filters (iii) Scraping and removal in filters rapid sand (iv) Back washing in rapid sand filtersThe correct answer is
  1.    (i) and (ii)
  2.    (ii) and (iii)
  3.    (i) and (iv)
  4.    (ii) and (iv)
 Discuss Question
Answer: Option C. -> (i) and (iv)
Question 54. Sludge volume index is defined as the ratio of
  1.    Percentage of sludge by volume to percentage of suspended solids by weight
  2.    Percentage of sludge by volume to percentage of total solids by weight
  3.    Percentage of suspended solids by weight to percentage of sludge by volume
  4.    Percentage of total solids by weight to percentage of sludge by volume
 Discuss Question
Answer: Option A. -> Percentage of sludge by volume to percentage of suspended solids by weight
Question 55. The maximum permissible limit for fluoride in drinking water is
  1.    0.1 mg/liter
  2.    1.5 mg/liter
  3.    5 mg/liter
  4.    10 mg/liter
 Discuss Question
Answer: Option B. -> 1.5 mg/liter
Question 56. Facultative bacteria are able to work in
  1.    Presence of oxygen only
  2.    Absence of oxygen only
  3.    Presence as well as in absence of oxygen
  4.    Presence of water
 Discuss Question
Answer: Option C. -> Presence as well as in absence of oxygen
Question 57. The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of
  1.    1 mg/liter
  2.    10 mg/liter
  3.    100 mg/liter
  4.    1000 mg/liter
 Discuss Question
Answer: Option B. -> 10 mg/liter
Question 58. The minimum dissolved oxygen which should always be present in water in order to save the aquatic life is
  1.    1 ppm
  2.    4 ppm
  3.    10 ppm
  4.    40 ppm
 Discuss Question
Answer: Option B. -> 4 ppm
Question 59. As compared to geometrical increase method of forecasting population, arithmetical increase method gives
  1.    Lesser value
  2.    Higher value
  3.    Same value
  4.    Accurate value
 Discuss Question
Answer: Option A. -> Lesser value
Question 60. The rate of BOD exerted at any time is
  1.    Directly proportional to BOD satisfied
  2.    Directly proportional to BOD remaining
  3.    Inversely proportional to BOD satisfied
  4.    Inversely proportional to BOD remaining
 Discuss Question
Answer: Option B. -> Directly proportional to BOD remaining

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