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?
- 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?
- 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