Question 31 : According to which of the following, organism destroyed by disinfection is proportional to organism remaining?
1. Hazens equation
2. Chicks law
3. Darcy's law
4. Rose equation
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Question 32 : When the pH is between 5 and 10, the chlorine in the water acts as ______
1. Hypochlorous acid
2. Hypochlorite ions
3. Molecular chlorine
4. Hypochlorous acid hypochlorite ions
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Question 33 : __________ is the application of chlorine at two or more points in the purification process.
1. Plain chlorination
2. Pre chlorination
3. Super chlorination
4. Double chlorination
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Question 34 : What happens to the hypoiodous acid when the pH is over 8?
1. HIO is stable
2. Formation of hypoiodite ion takes place
3. Formation of iodine and hypoiodite ion takes place
4. Formation of iodine and iodate takes place
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Question 35 : Which of the following is most effective in the killing of bacteria present in water?
1. Nascent oxygen
2. Chlorine
3. HOBr
4. I2
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Question 36 : The permissible limit of free residual chlorine is
1. 0.02ppm
2. 0.2ppm
3. 1ppm
4. 2ppm
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Question 37 : Which method of disinfection is mainly used in rural areas?
1. Boiling method
2. Excess lime treatment
3. Potassium permanganate treatment
4. Silver treatment
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Question 38 : When the coefficient of dilution is 1, then which of the following statement is correct?
1. Time of contact is more important than dosage
2. The dosage is more important than time of contact
3. Concentration and time are equally important
4. Efficiency of dilution decreases.
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Question 39 : Sunlight is a ________ method of disinfection.
1. Physical
2. Chemical
3. Mechanical
4. Electrical
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Question 40 : State whether the following statement is true or false.
Iodine is a better disinfectant to kill virus than hypoiodous acid.
1. True
2. False
3.
4.
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