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MCQs

Total Questions : 828 | Page 2 of 83 pages
Question 11. For satisfactory working of a sludge digestion unit, the pH range of digested sludge should be maintained as
  1.    4.5 to 6.0
  2.    6.5 to 8.0
  3.    8.5 to 10.0
  4.    10.5 to 12.0
 Discuss Question
Answer: Option B. -> 6.5 to 8.0
Question 12. Sewage treatment units are designed for
  1.    Maximum flow only
  2.    Minimum flow only
  3.    Average flow only
  4.    Maximum and minimum flow
 Discuss Question
Answer: Option C. -> Average flow only
Question 13. The pathogens can be killed by
  1.    Nitrification
  2.    Chlorination
  3.    Oxidation
  4.    None of the above
 Discuss Question
Answer: Option B. -> Chlorination
Question 14. Orthotolidine test is used for determination of
  1.    Dissolved oxygen
  2.    Residual chlorine
  3.    Biochemical oxygen demand
  4.    Dose of coagulant
 Discuss Question
Answer: Option B. -> Residual chlorine
Question 15. Period of cleaning of slow sand filters is about
  1.    24 - 48 hours
  2.    10 - 12 days
  3.    2 - 3 months
  4.    1 - 2 year
 Discuss Question
Answer: Option C. -> 2 - 3 months
Question 16. The rate of filtration in slow sand filters in million litres per day per hectare is about
  1.    50 to 60
  2.    100 to 150
  3.    500 to 600
  4.    1400 to 1500
 Discuss Question
Answer: Option A. -> 50 to 60
Question 17. The working conditions in imhoff tanks are
  1.    Aerobic only
  2.    Anaerobic only
  3.    Aerobic in lower compartment and anaerobic in upper compartment
  4.    Anaerobic in lower compartment and aerobic in upper compartment
 Discuss Question
Answer: Option D. -> Anaerobic in lower compartment and aerobic in upper compartment
Question 18. The self cleansing velocity for all sewers in India is usually
  1.    Less than 1.0 m/sec
  2.    1.0 m/sec to 1.2 m/sec
  3.    1.5 m/sec to 2.0 m/sec
  4.    3.0 m/sec to 3.5 m/sec
 Discuss Question
Answer: Option B. -> 1.0 m/sec to 1.2 m/sec
Question 19. The method of analysis of distribution system in which the domestic supply is neglected and fire demand is considered is
  1.    Circle method
  2.    Equivalent pipe method
  3.    Electrical analysis method
  4.    Hardy cross method
 Discuss Question
Answer: Option A. -> Circle method
Question 20. Residual chlorine in water is determined by
  1.    Starch iodide method
  2.    Orthotolidine method
  3.    Both (A) and (B)
  4.    None of the above
 Discuss Question
Answer: Option C. -> Both (A) and (B)

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