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MCQs

Total Questions : 100 | Page 5 of 10 pages
Question 41. ______ is determined by measuring the dissolved oxygen used during the chemical oxidation of organic matter in 3 hours.
  1.    COD
  2.    BOD
  3.    ThOD
  4.    TOC
 Discuss Question
Answer: Option A. -> COD
Answer: (a).COD
Question 42. Which of the following indicates that the water body has been used for waste disposal?
  1.    Chlorides
  2.    Nitrates
  3.    Phosphates
  4.    Ammonia
 Discuss Question
Answer: Option A. -> Chlorides
Answer: (a).Chlorides
Question 43. Which of the following is used for a small concentration of organic matter?
  1.    COD
  2.    TOC
  3.    BOD
  4.    ThOD
 Discuss Question
Answer: Option B. -> TOC
Answer: (b).TOC
Question 44. What is the TSS effluent concentration for 7 days?
  1.    30 mg/L
  2.    45 mg/L
  3.    25 mg/L
  4.    40 mg/L
 Discuss Question
Answer: Option B. -> 45 mg/L
Answer: (b).45 mg/L
Question 45. What is the maximum concentration of total solids present in wastewater?
  1.    350 mg/L
  2.    720 mg/L
  3.    1200 mg/ L
  4.    850 mg/L
 Discuss Question
Answer: Option C. -> 1200 mg/ L
Answer: (c).1200 mg/ L
Question 46. At what temperature the bottles for the BOD test are incubated?
  1.    25 degree Celsius
  2.    35 degree Celsius
  3.    20 degree Celsius
  4.    30 degree Celsius
 Discuss Question
Answer: Option C. -> 20 degree Celsius
Answer: (c).20 degree Celsius
Question 47. The BOD test is carried out for how many days?
  1.    1 day
  2.    2 days
  3.    5 days
  4.    6 days
 Discuss Question
Answer: Option C. -> 5 days
Answer: (c).5 days
Question 48. What is the mathematical expression of BOD?
  1.    BOD = [(D1-D2)-(B1-B2)f]/P
  2.    BOD = [(D1-D2)-(B1-B2)f].
  3.    BOD = [(D1-D2) f]/P
  4.    BOD = [(D1-D2)-(B1-B2)]/P
 Discuss Question
Answer: Option A. -> BOD = [(D1-D2)-(B1-B2)f]/P
Answer: (a).BOD = [(D1-D2)-(B1-B2)f]/P
Question 49. How is COD calculated?
  1.    Waste water is oxidised chemically using sodium in acid solutions
  2.    Waste water is oxidised chemically using dichromate in acid solutions
  3.    Waste water is oxidised chemically using bromine in acid solutions
  4.    Waste water is oxidised chemically using strontium in acid solutions
 Discuss Question
Answer: Option B. -> Waste water is oxidised chemically using dichromate in acid solutions
Answer: (b).Waste water is oxidised chemically using dichromate in acid solutions
Question 50. In terms of percentage how much BOD is oxidised in 5 days?
  1.    90%
  2.    70-90%
  3.    60-70%
  4.    50%
 Discuss Question
Answer: Option C. -> 60-70%
Answer: (c).60-70%

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