200 Best MCQs on Water Treatment- biochemical engineering
Q25). The ultimate source of water is
a).rivers and lakes
b).dew and forest
c).rain and snow
d).underground and surface
Correct Answer:
rain and snow
Explaination:
Q26). Permanent hardness of water may be removed by the addition of
a).lime
b).soda ash
c).potassium permagnate
d).sodium bicarbonate
Correct Answer:
soda ash
Explaination:
Q27). Both temporary and permanent hardness of water can be removed on boiling water with
a).calcium hydroxide
b).sodium carbonate
c).calcium oxide
d).calcium carbonate
Correct Answer:
sodium carbonate
Explaination:
Q28). Lagoons may be characterized as
a).anaerobic
b).facultative
c).aerated
d).all of these
Correct Answer:
all of these
Explaination:
Q29). Temporary hardness of water may be removed by adding
a).calcium hydroxide
b).calcium carbonate
c).calcium chloride
d).sodium bicarbonate
Correct Answer:
calcium hydroxide
Explaination:
Q30). The maximum desirable limit (BIS of mercury in the drinking water is
a).0.05 mg/l
b).0.9 mg/l
c).0.1 mg/l
d).0.001 mg/l
Correct Answer:
0.001 mg/l
Explaination:
Q31). From the following sanitizers which one comes under category of surface active agents?
a).Tetra phosphate
b).Teepol
c).Meta phosphate
d).None of these
Correct Answer:
Teepol
Explaination:
Q32). The purest form of naturally occurring water is
a).rain water
b).river water
c).pond water
d).well water
Correct Answer:
rain water
Explaination: