Question 1 : State whether the following statement is true or false.
The temperature of disinfection is inversely proportional to the killing of organisms.
1. True
2. False
3.
4.
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Question 2 : Which type of chlorine is represented by the red line as shown in figure?
1. Free residual chlorine
2. Ammonia chlorine
3. Combined residual chlorine
4. Residual chloramine
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Question 3 : Consider the following variables.
1. Concentration of disinfectant
2. Concentration of organisms
3. Temperature
4. Time of contact
Disinfection is the function of which of the following variables?
1. 1, 2
2. 1, 2, 3
3. 1, 2, 3, 4
4. 2, 3, 4
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Question 4 : What is the contact period for disinfection with chloramine?
1. 1hour
2. 2hours
3. 3hours
4. 4hours
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Question 5 : The process of removal of excess chlorine from water is
1. Plain chlorination
2. Dechlorination
3. Super chlorination
4. Double chlorination
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Question 6 : Which of the following is termed as free available chlorine?
1. Hypochlorous acid
2. Hypochlorite ions
3. Molecular chlorine
4. Hypochlorous acid, Hypochlorite ions, Molecular chlorine
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Question 7 : The chlorine, which serve as a disinfectant is
1. Free chlorine
2. Free Residual chlorine
3. Chlorine demand
4. Residual demand
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Question 8 : At what pH, chlorine in water acts as only hypochlorite ions?
1. <5
2. >5
3. >10
4. <3
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Question 9 : Which of the following regarding break point chlorination is wrong?
1. It will have adequate chlorine residual
2. It will remove manganese
3. It will remove taste and odor
4. It is determined by physical test
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Question 10 : Efficiency of dilution decreases rapidly when the coefficient of dilution is
1. 0
2. 1
3. <1
4. >1
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