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MCQs

Total Questions : 129 | Page 6 of 13 pages
Question 51. The biochemical oxygen demand is computed by __________
  1.    Dissolved oxygen / Dilution factor
  2.    Dissolved oxygen + Dilution factor
  3.    Dissolved oxygen – Dilution factor
  4.    Dissolved oxygen * Dilution factor
 Discuss Question
Answer: Option D. -> Dissolved oxygen * Dilution factor
Answer: (d).Dissolved oxygen * Dilution factor
Question 52. The average standard BOD of domestic sewage is measured in ____________
  1.    ppm
  2.    Kg/day
  3.    Kg per person per day
  4.    Number of persons per day
 Discuss Question
Answer: Option C. -> Kg per person per day
Answer: (c).Kg per person per day
Question 53. The value of deoxygenation constant is independent of the temperature.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 54. The expression of relative stability at 20°C is given by ___________
  1.    S = (1-(0.794)T²⁰)
  2.    S = 100 (1-(0.794)ᵀ²⁰)
  3.    S = 1-(0.794)ᵀ²⁰
  4.    S = 100 (0.794)T²⁰
 Discuss Question
Answer: Option B. -> S = 100 (1-(0.794)ᵀ²⁰)
Answer: (b).S = 100 (1-(0.794)ᵀ²⁰)
Question 55. Which of the following id the correct expression of population equivalent?
  1.    BOD of industrial sewage in kg/day * 0.08
  2.    0.08 * BOD of industrial sewage kg/day
  3.    BOD of industrial sewage kg/day / 0.08kg/person/day
  4.    BOD of industrial sewage kg/day + 0.08
 Discuss Question
Answer: Option C. -> BOD of industrial sewage kg/day / 0.08kg/person/day
Answer: (c).BOD of industrial sewage kg/day / 0.08kg/person/day
Question 56. The oxidizing agent used in COD test is ___________
  1.    Potassium chloride
  2.    Potassium per-manganate
  3.    Potassium chromate
  4.    Potassium dichromate
 Discuss Question
Answer: Option D. -> Potassium dichromate
Answer: (d).Potassium dichromate
Question 57. Which of the following expression is correct regarding deoxygenation constant where symbols have their usual meaning?
  1.    KDT = KD20 + (1.047)ᵀ⁻²⁰
  2.    KDT = KD20 / (1.047)ᵀ⁻²⁰
  3.    KDT = KD20 (1.047)ᵀ⁻²⁰
  4.    KDT = KD20 (1.04ᵀ)
 Discuss Question
Answer: Option C. -> KDT = KD20 (1.047)ᵀ⁻²⁰
Answer: (c).KDT = KD20 (1.047)ᵀ⁻²⁰
Question 58. 5 days BOD at 20°C is ___ of total demand.
  1.    20%
  2.    47%
  3.    68%
  4.    100%
 Discuss Question
Answer: Option C. -> 68%
Answer: (c).68%
Question 59. The turbulence decreases the DO content of water.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 60. Which of the following is a prime lake pollutant?
  1.    Iodine
  2.    Phosphorous
  3.    Potassium
  4.    Sodium
 Discuss Question
Answer: Option B. -> Phosphorous
Answer: (b).Phosphorous

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