Q. The maximum desirable limit (BIS) of total hardness (as CaCo3) in drinking water is

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Q. The chemical oxygen demand (COD)measures the

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Q. Which of the following physical method is used as germicidal in modern time for the treatment of drinking water?

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Q. Sanitizer used specifically for vitreous enamel are

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Q. The common methods used for disinfection in waste water treatment plants are

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Q. Inhibitors are used along with sanitizer to

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Q. Sanitizers used for rubber made equipments are

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Q. Which of the following substances are commonly used in a filter?

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Q. Biological oxidation processes usually referred as biological treatment, are the most common form of

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Q. The maximum permissible limit (BIS) of turbidity in drinking water is

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Q. Sedimentation is a physical process used in wastewater treatment to

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Q. The ultimate source of water is

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Q. The activated sludge process is sometime referred as

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Q. BOD stands for

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

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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. The methods used for biological treatment are

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

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

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Q. Lagoons may be characterized as

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