Q. Fluorides in solution form are preferred over powdered form for fluoridation.

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Q. What happens when water contains 8-20 ppm of fluoride concentration?

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Q. The process of reducing the fluoride content from water is called _____

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Q. Which of the following is not used for defluoridation?

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Q. At which temperature, the bone is calcinated during defluoridation with calcium phosphate?

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Q. One cubic metre of bone can treat how much quantity of water containing 3.5 ppm of fluoride?

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Q. Which material is used in contact filters for the removal of fluorides?

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Q. Which material is used for removing fluorides from hard water containing 3ppm of fluorides?

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Q. Fluorex is a special mixture of ____________

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Q. Which of the following method is not used for desalination?

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Q. Which of the following is not a type of distillation plant?

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Q. Multistage flash evaporator produces _____ kg of water per kg of prime steam.

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Q. Which of the following is the best evaporative desalinating method?

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Q. The number of stages involved in the desalination using a multistage flash evaporator is _________________

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Q. Which of the following desalination method is more suitable for brackish water than sea water?

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Q. The process in which the brackish water is forced across a permeable membrane by mechanical forces is called as _____________

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Q. In which desalination process, the salt ions are removed from seawater by means of electric current?

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Q. In Electro-dialysis, the electric energy which required is _____________

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Q. The maximum salt concentration up to which desalination of brackish water is possible by Electro-dialysis is _____________

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Q. In which desalination process, the cooling of sea water is done to obtain fresh water?

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