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

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Q. Secondary treatment uses __________ to consume wastes.

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

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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. Permanent hard water may be softened by passing it through

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Q. Hardness of water does not

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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. Acid used mostly for removal of milk stone is

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

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

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Q. Application of quaternary ammonium compounds as sanitizing agents tends to

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Q. The maximum desirable limit (BIS of mercury in the drinking water is

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Q. Temporary hardness of water may be removed by adding

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Q. Lagoons may be characterized as

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Q. Both temporary and permanent hardness of water can be removed on boiling water with

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Q. Permanent hardness of water may be removed by the addition of

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Q. The methods used for biological treatment are

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Q. Zeolite softening process removes both temporary and permanent hardness of water. In this process the calcium and magnesium present in water are precipitated as

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Q. When temporary hard water is boiled, one of the substances formed is

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Q. BOD stands for

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