Q. Permanent hardness of water is caused by the presence of

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Q. According to BIS the maximum permissible limit of dissolved solids in drinking water is

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Q. Acid used mostly for removal of milk stone is

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Q. Which of the following chemical is sometime added in the process of coagulation and flocculation?

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Q. Hardness of water does not

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Q. Permanent hard water may be softened by passing it through

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Q. Zeolite used in zeolite softening process for the treatment of hard water gets exhausted after certain time of usage but can be regenerated by flushing it with

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Q. Temporary hardness of water is caused by the presence of

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Q. Secondary treatment uses __________ to consume wastes.

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Q. From the following sanitizers which one comes under category of surface active agents?

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Q. The purest form of naturally occurring water is

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Q. Calgon is used for removal of

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Q. The water being used in dairy industry should contain not more than

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Q. The activated sludge process consists of returning a portion of the clarifier

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Q. Both temporary and permanent hardness of water can be removed by

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Q. Coliform bacteria in water is an indication of the presence of

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