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MCQs

Total Questions : 90 | Page 1 of 9 pages
Question 1. In which sludge treatment process, the sludge is treated with chemicals?
  1.    Dewatering
  2.    Thickening
  3.    Conditioning
  4.    Drying
 Discuss Question
Answer: Option C. -> Conditioning
Answer: (c).Conditioning
Question 2. How many stages are there in the sludge digestion process?
  1.    2
  2.    3
  3.    4
  4.    5
 Discuss Question
Answer: Option B. -> 3
Answer: (b).3
Question 3. The form of sludge which is free from pathogenic bacteria is ___________
  1.    Undigested sludge
  2.    Digested sludge
  3.    Primary sludge
  4.    Supernatant liquor
 Discuss Question
Answer: Option B. -> Digested sludge
Answer: (b).Digested sludge
Question 4. The BOD of supernatant liquor in a sludge digestion process is ____ ppm.
  1.    3000
  2.    0
  3.    1000
  4.    250
 Discuss Question
Answer: Option A. -> 3000
Answer: (a).3000
Question 5. Which of the following is correct regarding pH in different stages of the sludge digestion process?
  1.    Acid fermentation > Acid regression > Alkaline fermentation
  2.    Acid regression > Acid fermentation > Alkaline fermentation
  3.    Acid fermentation < Acid regression < Alkaline fermentation
  4.    Acid fermentation < Acid regression > Alkaline fermentation
 Discuss Question
Answer: Option C. -> Acid fermentation < Acid regression < Alkaline fermentation
Answer: (c).Acid fermentation < Acid regression < Alkaline fermentation
Question 6. Which gas evolves the most in the sludge digestion process?
  1.    SO₂
  2.    CO₂
  3.    N₂
  4.    CH₄
 Discuss Question
Answer: Option D. -> CH₄
Answer: (d).CH₄
Question 7. The color of digestive sludge is ___________
  1.    Blue
  2.    Black
  3.    Brown
  4.    Gray
 Discuss Question
Answer: Option B. -> Black
Answer: (b).Black
Question 8. The maximum temperature at which thermophilic microorganisms remain active in sludge digester is ___________
  1.    60°C
  2.    40°C
  3.    30°C
  4.    20°C
 Discuss Question
Answer: Option A. -> 60°C
Answer: (a).60°C
Question 9. Which of the following is correct regarding anaerobic digestion in the sludge digestion process?
  1.    It contains high amount of biomass
  2.    It is a low energy process
  3.    It causes infertility in soil
  4.    Aerobic bacteria oxidize the organic matter
 Discuss Question
Answer: Option B. -> It is a low energy process
Answer: (b).It is a low energy process
Question 10. Which of the following is incorrect about aerobic digestion in the sludge digestion process?
  1.    It has a low capital cost
  2.    It is easier to manage.
  3.    It has high residual energy
  4.    It decreases the BOD
 Discuss Question
Answer: Option C. -> It has high residual energy
Answer: (c).It has high residual energy

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