Question 31 : The maximum salt concentration up to which desalination of brackish water is possible by Electro-dialysis is
1. 1000ppm
2. 2000ppm
3. 3000ppm
4. 5000ppm
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Question 32 : Which of the following is a carbonaceous material?
1. Charcoal
2. Petroleum
3. Hydrogen sulfide
4. Sodium chloride
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Question 33 : What is the dose of copper sulfate required for the treatment of water?
1. 0.3-0.6ppm
2. 2-6ppm
3. 4-8ppm
4. 10-20ppm
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Question 34 : In which desalination process, the cooling of sea water is done to obtain fresh water?
1. Distillation
2. Electro-dialysis
3. Reverse osmosis
4. Freezing
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Question 35 : By aeration process, dissolved iron is oxidized into
1. Ferrous oxide
2. Ferric oxide
3. Ferrous hydroxide
4. Ferric hydroxide
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Question 36 : One cubic metre of bone can treat how much quantity of water containing 3.5 ppm of fluoride?
1. 10m³
2. 100m³
3. 1000m³
4. 10000m³
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Question 37 : Which of the following is the pure compound?
1. Sodium fluoride
2. Sodium silico fluoride
3. Hydrofluosilicic acid
4. Sodium fluro carbonate
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Question 38 : The taste produced by microorganism, can be controlled by
1. Potassium per-manganate
2. Potassium dichromate
3. Sodium chloride
4. Iodine
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Question 39 : Which of the following is not used for defluoridation?
1. Calcium phosphate
2. Copper sulfate
3. Alum
4. Bone charcoal
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Question 40 : In which desalination process, solar energy is used?
1. Reverse osmosis
2. Freezing
3. Electro-dialysis
4. Solar evaporation
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