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MCQs

Total Questions : 129 | Page 10 of 13 pages
Question 91. What is the value of BOD of industrial sewage in kg/day, given population equivalent as 6000 persons?
  1.    480
  2.    160
  3.    270
  4.    100
 Discuss Question
Answer: Option A. -> 480
Answer: (a).480
Question 92. Calculate the percentage of relative stability, given 5 day incubation period at 37°C.
  1.    50%
  2.    60%
  3.    90%
  4.    99%
 Discuss Question
Answer: Option C. -> 90%
Answer: (c).90%
Question 93. COD is abbreviated as ___________
  1.    Chemical oxygen demand
  2.    Complex oxygen demand
  3.    Customary oxygen demand
  4.    Chemical oxygen deficit
 Discuss Question
Answer: Option A. -> Chemical oxygen demand
Answer: (a).Chemical oxygen demand
Question 94. _____ is the amount of oxygen required to oxidize both organic and inorganic matter in sewage.
  1.    Turbidity
  2.    BOD
  3.    COD
  4.    DO
 Discuss Question
Answer: Option C. -> COD
Answer: (c).COD
Question 95. The minimum depth to which sewage should be discharged of sea water is ____________
  1.    0.5m
  2.    1m
  3.    2m
  4.    3m
 Discuss Question
Answer: Option D. -> 3m
Answer: (d).3m
Question 96. The tolerance limit of COD of sewage to be discharged in sea water is ____________
  1.    250ppm
  2.    100ppm
  3.    40ppm
  4.    20ppm
 Discuss Question
Answer: Option A. -> 250ppm
Answer: (a).250ppm
Question 97. In which pollution zone of the river, the dissolved oxygen reduced to 0?
  1.    Zone of degradation
  2.    Zone of recovery
  3.    Zone of clean water
  4.    Zone of active decomposition
 Discuss Question
Answer: Option D. -> Zone of active decomposition
Answer: (d).Zone of active decomposition
Question 98. The pollution zones in the river are divided into how many types?
  1.    3
  2.    4
  3.    6
  4.    8
 Discuss Question
Answer: Option B. -> 4
Answer: (b).4
Question 99. In which pollution zone of the river, growth of algae reappear?
  1.    Zone of degradation
  2.    Zone of recovery
  3.    Zone of active decomposition
  4.    Zone of clean water
 Discuss Question
Answer: Option B. -> Zone of recovery
Answer: (b).Zone of recovery
Question 100. Which is the third zone of pollution in the river?
  1.    Zone of recovery
  2.    Zone of degradation
  3.    Zone of clean water
  4.    Zone of active decomposition
 Discuss Question
Answer: Option A. -> Zone of recovery
Answer: (a).Zone of recovery

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