Coliform bacteria in water is an indication of the presence of
radioactive wastes
excess fertilizer
decaying animals and plants
human feces
Correct answer is D
No explanation has been provided for this answer.
Both temporary and permanent hardness of water can be removed by
boiling
distillation
filtration
decantation
Correct answer is B
No explanation has been provided for this answer.
The methods used for biological treatment are
lagoon
activated sludge process
oxidation ditches
all of these
Correct answer is D
No explanation has been provided for this answer.
When temporary hard water is boiled, one of the substances formed is
calcium bicarbonate
calcium sulfate
hydrogen chloride
carbon dioxide
Correct answer is D
No explanation has been provided for this answer.
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