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MCQs

Total Questions : 71 | Page 7 of 8 pages
Question 61. The dosage of ozone for municipal water treatment is __________
  1.    0.5 ppm
  2.    1ppm
  3.    1.5 ppm
  4.    2ppm
 Discuss Question
Answer: Option C. -> 1.5 ppm
Answer: (c).1.5 ppm
Question 62. The process of chlorination with hypochlorites is called ___________
  1.    Super chlorination
  2.    Pre chlorination
  3.    Post chlorination
  4.    Hypo-chlorination
 Discuss Question
Answer: Option D. -> Hypo-chlorination
Answer: (d).Hypo-chlorination
Question 63. What is the contact period for disinfection with chloramine?
  1.    1hour
  2.    2hours
  3.    3hours
  4.    4hours
 Discuss Question
Answer: Option B. -> 2hours
Answer: (b).2hours
Question 64. Which type of chloramine is formed when pH of water is 4.4?
  1.    Monachloramine
  2.    Dichloramine
  3.    Trichloramine
  4.    Both monochloramine and dichloramine
 Discuss Question
Answer: Option B. -> Dichloramine
Answer: (b).Dichloramine
Question 65. The normal dose of chlorine during plain chlorination is ___________
  1.    0.5-1ppm
  2.    0.1-0.2ppm
  3.    0.1-0.5ppm
  4.    1-2ppm
 Discuss Question
Answer: Option A. -> 0.5-1ppm
Answer: (a).0.5-1ppm
Question 66. Normally, the ratio of ammonia and chlorine in chloramine is?
  1.    1:1
  2.    1:2
  3.    1:4.5
  4.    1:3.5
 Discuss Question
Answer: Option C. -> 1:4.5
Answer: (c).1:4.5
Question 67. When turbidity in water increases, the efficiency of chlorine?
  1.    Decreases
  2.    Increases
  3.    Slightly increases
  4.    Remains constant
 Discuss Question
Answer: Option A. -> Decreases
Answer: (a).Decreases
Question 68. The amount of hypochlorous acid formed when pH of water is 8 is _______________
  1.    95% of total free chlorine
  2.    80% of total free chlorine
  3.    30% of total free chlorine
  4.    5% of total free chlorine
 Discuss Question
Answer: Option C. -> 30% of total free chlorine
Answer: (c).30% of total free chlorine
Question 69. The contact time for disinfection by free chlorine is ______________
  1.    20 minutes
  2.    30 minutes
  3.    40 minutes
  4.    60minutes
 Discuss Question
Answer: Option A. -> 20 minutes
Answer: (a).20 minutes
Question 70. The efficiency of chlorine increase by ______________
  1.    Presence of metallic compounds
  2.    When the pH of the water increases
  3.    When the pH of the water decreases
  4.    Turbid water
 Discuss Question
Answer: Option C. -> When the pH of the water decreases
Answer: (c).When the pH of the water decreases

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