Inhibitors are used along with sanitizer to
improve their action
to prevent corrosion
both (a) and (b)
none of these
Correct answer is B
No explanation has been provided for this answer.
The common method(s) used for disinfection in waste water treatment plants are
chlorination
UV light
both (a) and (b)
Phenolic solvent
Correct answer is C
No explanation has been provided for this answer.
Sanitizer used specifically for vitreous enamel are
strong alkalis
strong acids
weak alkali with sodium silicate
none of these
Correct answer is C
No explanation has been provided for this answer.
Which of the following chemical is sometimes added in the process of coagulation and flocculation?
Aluminum sulphate
Aluminum oxide
Calcium chloride
None of these
Correct answer is A
No explanation has been provided for this answer.
Acid used mostly for removal of milk stone is
phosphoric acid
nitric acid
gluconic acid
tartaric acid
Correct answer is B
No explanation has been provided for this answer.
Permanent hardness of water is caused by the presence of
bicarbonates of calcium and magnesium
carbonates of sodium and potassium
chlorides and sulfates of calcium and magnesium
phosphates of sodium and potassium
Correct answer is C
No explanation has been provided for this answer.
Application of quaternary ammonium compounds as sanitizing agents tends to
favor gram positive bacteria
decrease gram positive bacteria
increase the percentage of gram(-)ve rods on utensils
none of the above
Correct answer is C
No explanation has been provided for this answer.
Secondary treatment uses __________ to consume wastes.
micro-organisms
chemicals
filtration
none of these
Correct answer is A
No explanation has been provided for this answer.
Temporary hardness of water is caused by the presence of
chlorides of calcium and magnesium
sulfates of calcium and magnesium
bicarbonates of calcium and magnesium
carbonates of sodium and potassium
Correct answer is C
No explanation has been provided for this answer.
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