Question 41 : The dosage of ozone for municipal water treatment is
1. 0.5 ppm
2. 1ppm
3. 1.5 ppm
4. 2ppm
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Question 42 : The contact time for disinfection by combined chlorine is
1. 20 minutes
2. 30 minutes
3. 40 minutes
4. 60minutes
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Question 43 : When turbidity in water increases, the efficiency of chlorine
1. Decreases
2. Increases
3. Slightly increases
4. Remains constant
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Question 44 : The presence of metallic compounds in water _______ the efficiency of chlorine.
1. Decreases
2. Increases
3. Slightly decreases
4. Remains constant
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Question 45 : Which water treatment process is done after filtration of water?
1. Primary sedimentation
2. Disinfection
3. Secondary sedimentation
4. Flocculation
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Question 46 : The amount of hypochlorous acid formed when pH of water is 8 is
1. 95% of total free chlorine
2. 80% of total free chlorine
3. 30% of total free chlorine
4. 5% of total free chlorine
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Question 47 : The depth of water while using ultra violet ray treatment for disinfection should be ____
1. 35cm
2. 46cm
3. 28cm
4. 10cm
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Question 48 : At what pH, the E-Coli bacteria will die in the water?
1. 6
2. 7
3. 9
4. >9.5
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Question 49 : Bleaching powder contains ______ of available chlorine.
1. 16%
2. 33.3%
3. 66.6%
4. 99.9%
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Question 50 : _______ is the application of chlorine beyond the stage of the break point.
1. Plain chlorination
2. Pre chlorination
3. Super chlorination
4. Double chlorination
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