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MCQs

Total Questions : 76 | Page 3 of 8 pages
Question 21. What is autotrophic biomass made up of?
  1.    Inert particulate matter
  2.    Endogenous residue
  3.    Biodegradable particle
  4.    Nitrifying bacteria
 Discuss Question
Answer: Option D. -> Nitrifying bacteria
Answer: (d).Nitrifying bacteria
Question 22. What is the temperature at which sludge constituting biosolids are composted?
  1.    55 degree Celsius
  2.    45 degree Celsius
  3.    65 degree Celsius
  4.    75 degree Celsius
 Discuss Question
Answer: Option A. -> 55 degree Celsius
Answer: (a).55 degree Celsius
Question 23. To what temperature is a sludge constituting liquid biosolids heated in order to treat it?
  1.    450 degree Celsius
  2.    200 degree Celsius
  3.    180 degree Celsius
  4.    300 degree Celsius
 Discuss Question
Answer: Option C. -> 180 degree Celsius
Answer: (c).180 degree Celsius
Question 24. What is the final water content of sludge after dewatering?
  1.    5%
  2.    2%
  3.    10%
  4.    1%
 Discuss Question
Answer: Option C. -> 10%
Answer: (c).10%
Question 25. For how many days the sludge constituting biosolids is subjected to composting?
  1.    1 day
  2.    2 days
  3.    3 days
  4.    5 days
 Discuss Question
Answer: Option C. -> 3 days
Answer: (c).3 days
Question 26. Activated sludge process uses micro-organisms to degrade organics from wastewater.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 27. Activated sludge process degrade organics and _________
  1.    Improve nutrients
  2.    Remove nutrients
  3.    Remove odour
  4.    Remove taste
 Discuss Question
Answer: Option B. -> Remove nutrients
Answer: (b).Remove nutrients
Question 28. What is required to keep the activated sludge suspended?
  1.    Carbon-dioxide
  2.    Nitrogen
  3.    Oxygen
  4.    Ammonia
 Discuss Question
Answer: Option C. -> Oxygen
Answer: (c).Oxygen
Question 29. Activated sludge process can be used for treating all types of wastewater.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 30. What does the bacterium use to grow?
  1.    Oxygen
  2.    Organic pollutants
  3.    Water
  4.    Carbon-dioxide
 Discuss Question
Answer: Option B. -> Organic pollutants
Answer: (b).Organic pollutants

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