Q.1
When turbidity in water increases, the efficiency of chlorine?
  • a) Decreases
  • b) Increases
  • c) Slightly increases
  • d) Remains constant
Q.2
The presence of metallic compounds in water _______ the efficiency of chlorine.
  • a) Decreases
  • b) Increases
  • c) Slightly decreases
  • d) Remains constant
Q.3
The amount of hypochlorous acid formed when pH of water is 8 is _______________
  • a) 95% of total free chlorine
  • b) 80% of total free chlorine
  • c) 30% of total free chlorine
  • d) 5% of total free chlorine
Q.4
Which type of chlorine is represented by the green line as shown in the following figure?
Questionenvironmental-engineering-questions-answers4.jpg
  • a) Free residual chlorine
  • b) Ammonia chlorine
  • c) Combined residual chlorine
  • d) Residual chloramine
Q.5
Which type of chlorine is represented by the red line as shown in the following figure?
Questionenvironmental-engineering-questions-answers5.jpg
  • a) Free residual chlorine
  • b) Ammonia chlorine
  • c) Combined residual chlorine
  • d) Residual chloramine
Q.6
The efficiency of chlorine increase by ______________
  • a) Presence of metallic compounds
  • b) When the pH of the water increases
  • c) When the pH of the water decreases
  • d) Turbid water
Q.7
The contact time for disinfection by free chlorine is ______________
  • a) 20 minutes
  • b) 30 minutes
  • c) 40 minutes
  • d) 60minutes
Q.8
The contact time for disinfection by combined chlorine is ______________
  • a) 20 minutes
  • b) 30 minutes
  • c) 40 minutes
  • d) 60 minutes
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