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Water Treatment



mcqs by everyone

Application of quaternary ammonium compounds as sanitizing agents tends to


Temporary hardness of water is caused by the presence of


The maximum desirable limit Bureau of Indian Standards
(BIS) of lead in the drinking water is


Conventional tertiary treatment is


Sedimentation is a physical process used in wastewater treatment to


Hardness of water does not


Coliform bacteria in water is an indication of the presence of


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


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


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


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


Zeolite softening process removes


Inhibitors are used along with sanitizer to


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


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


The methods used for biological treatment are


BOD stands for


The activated sludge process is sometime referred as


Lagoons may be characterized as


Sanitizer used specifically for vitreous enamel are


Acid used mostly for removal of milk stone is


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


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


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


Calgon is used for removal of


Both temporary and permanent hardness of water can be removed by


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


The chemical oxygen demand
(COD)measures the


The ultimate source of water is


Secondary treatment uses __________ to consume wastes