Question 51 : The pathogenic bacteria do not last long at a pH ______
1. >11
2. <11
3. <8
4. >8
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Question 52 : _________ is the application of chlorine before filtration.
1. Plain chlorination
2. Pre chlorination
3. Super chlorination
4. Double chlorination
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Question 53 : What is the dose of lime required in the excess lime treatment?
1. 10-20ppm
2. 0-10ppm
3. 5-10ppm
4. 5-20ppm
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Question 54 : The chemical formula of hypoiodous acid is
1. H₂IO
2. H₂I
3. HIO
4. HI₂
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Question 55 : The normal dose of chlorine during pre chlorination is
1. 0.5-1ppm
2. 0.1-0.2ppm
3. 0.1-0.5ppm
4. 1-2ppm
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Question 56 : The number of organisms in disinfection process can be expressed by
1. Cⁿ *t _p = Constant
2. C ⁿ/ t_p = Constant
3. C ^q * N_p = Constant
4. C ^q / N_p = Constant
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Question 57 : Normally, the ratio of ammonia and chlorine in chloramine is
1. 1:1
2. 1:2
3. 1:4.5
4. 1:3.5
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Question 58 : The expression loge N1/N = – kt m Where, m is a constant such that m>1 represents
1. Rate of the kill will remains constant with time
2. Rate of the kill will increase with time
3. Rate of the kill will decrease with time
4. Rate of the kill is directly proportional to time
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Question 59 : Ozone is a _______ allotrope of oxygen.
1. Monoatomic
2. Diatomic
3. Triatomic
4. Polyatomic
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Question 60 : The normal dose of chlorine during post chlorination is
1. 0.5-1ppm
2. 0.1-0.2ppm
3. 0.1-0.5ppm
4. 1-2ppm
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