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MCQs

Total Questions : 129 | Page 4 of 13 pages
Question 31. The presence of which of the following in sewage indicates nitrogen content before decomposition of sewage?
  1.    Nitrites
  2.    Nitrates
  3.    Free ammonia
  4.    Albuminoid nitrogen
 Discuss Question
Answer: Option D. -> Albuminoid nitrogen
Answer: (d).Albuminoid nitrogen
Question 32. Which chemical is used for the titration of waste water for finding its chloride content?
  1.    Potassium chloride
  2.    Sodium chloride
  3.    Potassium chromate
  4.    Potassium dichromate
 Discuss Question
Answer: Option C. -> Potassium chromate
Answer: (c).Potassium chromate
Question 33. The presence of which of the following indicates old pollution?
  1.    Nitrates
  2.    Nitrites
  3.    H₂S
  4.    Sulfates
 Discuss Question
Answer: Option D. -> Sulfates
Answer: (d).Sulfates
Question 34. The presence of free ammonia in sewage represents ____________
  1.    Air pollution
  2.    Old pollution
  3.    Recent pollution
  4.    Water pollution
 Discuss Question
Answer: Option C. -> Recent pollution
Answer: (c).Recent pollution
Question 35. The type of solids which floats in sewage is __________
  1.    Suspended solids
  2.    Settleable solids
  3.    Dissolved solids
  4.    Total solids
 Discuss Question
Answer: Option A. -> Suspended solids
Answer: (a).Suspended solids
Question 36. BOD of wastewater having aerobic oxidation is more than that, having anaerobic oxidation.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 37. Which of the following is formed due to the anaerobic decomposition of carbonaceous organic matter?
  1.    Nitrites
  2.    Carbon dioxide
  3.    Water
  4.    Nitrogen
 Discuss Question
Answer: Option B. -> Carbon dioxide
Answer: (b).Carbon dioxide
Question 38. Methane is formed due to the reduction of __________
  1.    Nitrates
  2.    Sulfates
  3.    Carbon dioxide
  4.    Organic acids
 Discuss Question
Answer: Option D. -> Organic acids
Answer: (d).Organic acids
Question 39. The aerobic decomposition of nitrogenous organic matter gives __________
  1.    Nitrites and water
  2.    Carbon dioxide and water
  3.    Nitrates and ammonia
  4.    Nitrogen and ammonia
 Discuss Question
Answer: Option C. -> Nitrates and ammonia
Answer: (c).Nitrates and ammonia
Question 40. Which of the following is formed due to the reduction of sulfurous organic matter?
  1.    Hydrogen sulfide
  2.    Hydrochloric acid
  3.    Sulfuric acid
  4.    Sulfur dioxide
 Discuss Question
Answer: Option A. -> Hydrogen sulfide
Answer: (a).Hydrogen sulfide

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