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MCQs

Total Questions : 74 | Page 3 of 8 pages
Question 21. _________ is an aerobic process of mixing sewage sludge with agricultural by-product sources.
  1.    Aerobic digestion
  2.    Anaerobic digestion
  3.    Composting
  4.    Incineration
 Discuss Question
Answer: Option C. -> Composting
Answer: (c).Composting
Question 22. Which of the following is not a product of anaerobic digestion?
  1.    Water
  2.    Oxygen
  3.    Carbon dioxide
  4.    Methane
 Discuss Question
Answer: Option B. -> Oxygen
Answer: (b).Oxygen
Question 23. Which of the following is an advantage of anaerobic digestion?
  1.    Capital cost
  2.    Time
  3.    Methane generation
  4.    Space
 Discuss Question
Answer: Option C. -> Methane generation
Answer: (c).Methane generation
Question 24. Which of the following processes is rarely used?
  1.    Aerobic digestion
  2.    Anaerobic digestion
  3.    Composting
  4.    Incineration
 Discuss Question
Answer: Option D. -> Incineration
Answer: (d).Incineration
Question 25. Toxic chemicals are removed from liquid sewage by _______
  1.    Adsorption
  2.    Absorption
  3.    Desorption
  4.    Sorption
 Discuss Question
Answer: Option D. -> Sorption
Answer: (d).Sorption
Question 26. What is the percentage of thickness that can be achieved for primary sludge?
  1.    2-3 %
  2.    4-5 %
  3.    6-8 %
  4.    8-10 %
 Discuss Question
Answer: Option D. -> 8-10 %
Answer: (d).8-10 %
Question 27. Which is the first step in the sludge treatment process?
  1.    Thickening
  2.    Dewatering
  3.    Digestion
  4.    Phosphorus recovery
 Discuss Question
Answer: Option A. -> Thickening
Answer: (a).Thickening
Question 28. Reducing the sludge volume increases _______
  1.    pH
  2.    temperature
  3.    concentration
  4.    water
 Discuss Question
Answer: Option C. -> concentration
Answer: (c).concentration
Question 29. What is the percentage of thickness that can be achieved for secondary sludge?
  1.    1 %
  2.    2 %
  3.    3 %
  4.    4 %
 Discuss Question
Answer: Option D. -> 4 %
Answer: (d).4 %
Question 30. Secondary sludge constitutes which of the following?
  1.    Chemical sludge
  2.    Settlable solids
  3.    Biological solids
  4.    Biological and settlable solids
 Discuss Question
Answer: Option D. -> Biological and settlable solids
Answer: (d).Biological and settlable solids

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