Question 41 : Granular activated carbon has a surface area of
1. 100-200m²/g
2. 500-1400m²/g
3. 400-600m²/g
4. 500-900m²/g
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Question 42 : State whether the following statement is true or false.
Activated carbon in powder form is applied in the mixing basin.
1. True
2. False
3.
4.
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Question 43 : Removal of manganese from water takes place at a pH of ______
1. 1.5
2. 3
3. 6
4. 9.4
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Question 44 : There are protozoa present in the water. Its name is Dinobryen. What is the dose of copper sulfate required to kill it?
1. 0.02ppm
2. 0.3ppm
3. 0.5ppm
4. 0.8ppm
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Question 45 : Which of the following is not used as a fluoride compound?
1. Sodium fluoride
2. Sodium silico fluoride
3. Hydrofluosilicic acid
4. Sodium fluro carbonate
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Question 46 : The number of stages involved in the desalination using a multistage flash evaporator is
1. 20
2. 38
3. 49
4. 69
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Question 47 : For removal of iron from water, ________ mg of oxygen is required.
1. 0.14
2. 0.50
3. 1
4. 1.5
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Question 48 : The thickness of the activated carbon filter bed is
1. 10-20cm
2. 30-80cm
3. 75-100cm
4. 40-50cm
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Question 49 : Which of the following is the best evaporative desalinating method?
1. Vertical tube evaporator
2. Multistage flash evaporator
3. Tube settler
4. Multi-effect multistage flash evaporator
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Question 50 : Activated carbon can be applied to raw water ______ treatment process.
1. During
2. Ahead of
3. Before
4. After
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