From the following sanitizers which one comes under category of surface active agents?
Tetra phosphate
Teepol
Meta phosphate
None of these
Correct answer is B
No explanation has been provided for this answer.
Temporary hardness of water may be removed by adding
calcium hydroxide
calcium carbonate
calcium chloride
sodium bicarbonate
Correct answer is A
No explanation has been provided for this answer.
Lagoons may be characterized as
anaerobic
facultative
aerated
all of these
Correct answer is D
No explanation has been provided for this answer.
Both temporary and permanent hardness of water can be removed on boiling water with
calcium hydroxide
sodium carbonate
calcium oxide
calcium carbonate
Correct answer is B
No explanation has been provided for this answer.
Permanent hardness of water may be removed by the addition of
lime
soda ash
potassium permagnate
sodium bicarbonate
Correct answer is B
No explanation has been provided for this answer.
The ultimate source of water is
rivers and lakes
dew and forest
rain and snow
underground and surface
Correct answer is C
No explanation has been provided for this answer.
Sedimentation is a physical process used in wastewater treatment to
remove particles that are less dense than water
remove particles that are more dense than water
remove the pertinacious material from the water
none of the above
Correct answer is B
No explanation has been provided for this answer.
Biological oxidation processes usually referred as biological treatment, are the most common form of
primary treatment
secondary treatment
tertiary treatment
all of these
Correct answer is B
No explanation has been provided for this answer.
Which of the following substances are commonly used in a filter?
Charcoal
Sand
Both (a) and (b)
Aluminum chloride
Correct answer is C
No explanation has been provided for this answer.
Sanitizers used for rubber made equipments are
strong acids
strong alkalis
combination of both
none of these
Correct answer is B
No explanation has been provided for this answer.
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