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Water Treatment
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Temporary hardness of water is caused by the presence of
bicarbonates of calcium and magnesium
sulfates of calcium and magnesium
chlorides of calcium and magnesium
carbonates of sodium and potassium
Which of the following substances are commonly used in a filter
charcoal
Sand
Aluminum chloride
Both (a) and (b)
According to BIS the maximum permissible limit of dissolved solids in drinking water is
2000 mg/l
1500 mg/l
1000 mg/l
500 mg/l
Permanent hardness of water is caused by the presence of
chlorides and sulfates of calcium and magnesium
carbonates of sodium and potassium
phosphates of sodium and potassium
bicarbonates of calcium and magnesium
Zeolite softening process removes
only permanent hardness of water
only temporary hardness of water
both temporary and permanent hardness of water
the dissolved gases in permanent hard water
From the following sanitizers which one comes under category of surface active agents
Teepol
NONE OF THESE
Tetra phosphate
Meta phosphate
Coliform bacteria in water is an indication of the presence of
human feces
radioactive wastes
excess fertilizer
decaying animals and plants
Calgon is used for removal of
permanent hardness of water
NONE OF THESE
Sodium Carbonate
Potassium carbonate
The methods used for biological treatment are
All of These
activated sludge process
oxidation ditches
Lagoon
Sanitizers used for rubber made equipments are
combination of both
strong acids
NONE OF THESE
strong alkalis
Both temporary and permanent hardness of water can be removed by
Boiling
Distillation
decantation
Filtration
The activated sludge process is sometime referred as
turning bed biological oxidation system
None of the above
fixed bed biological oxidation system
fluid bed biological oxidation system
The purest form of naturally occurring water is
river water
Well water
Rain Water
pond water
When temporary hard water is boiled, one of the substances formed is
Carbon dioxide
calcium sulfate
Calcium bicarbonate
hydrogen chloride
Secondary treatment uses __________ to consume wastes
NONE OF THESE
micro-organisms
Filtration
Chemicals
The activated sludge process consists of returning a portion of the clarifier
influent water entering the reactor
effluent water entering the reactor
influent water coming out of the reactor
effluent water coming out of the reactor
The maximum permissible limit
(BIS) of turbidity in drinking water is
10 NTU
5 NTU
15 NTU
20 NTU
Temporary hardness of water may be removed by adding
Sodium bicarbonate
Calcium chloride
Calcium hydroxide
calcium carbonate
The ultimate source of water is
dew and forest
rivers and lakes
rain and snow
underground and surface
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
10% magnesium chloride solution
10% sodium chloride solution
10% calcium chloride solution
10% magnesium sulfate solution
The maximum desirable limit Bureau of Indian Standards
(BIS) of lead in the drinking water is
0.05 mg/l
0.09 mg/l
0.1 mg/l
1.0 mg/l
Application of quaternary ammonium compounds as sanitizing agents tends to
decrease gram positive bacteria
increase the percentage of gram(-)ve rods on utensils
favor gram positive bacteria
None of the above
Conventional tertiary treatment is
NONE OF THESE
Sedimentation
chemical coagulation and flocculation
Filtration
Hardness of water does not
cause difficulty in the washing of clothes with soaps
make cooking of foods difficult
make it unfit for drinking
have any bad effect in boiler
Sedimentation is a physical process used in wastewater treatment to
remove particles that are more dense than water
None of the above
remove particles that are less dense than water
remove the pertinacious material from the water
The maximum desirable limit
(BIS of mercury in the drinking water is
0.05 mg/l
0.9 mg/l
0.001 mg/l
0.1 mg/l
Which of the following chemical is sometime added in the process of coagulation and flocculation
NONE OF THESE
Calcium chloride
Aluminum oxide
Aluminum sulphate
BOD stands for
british oxygen depletion
biochemical oxygen demand
british oxygen demand
biological oxygen depletion
The maximum desirable limit
(BIS) of total hardness
(as CaCo3) in drinking water is
1000 ppm
500 ppm
300 ppm
600 ppm
Inhibitors are used along with sanitizer to
to prevent corrosion
Both (a) and (b)
improve their action
NONE OF THESE
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