Foxoyo
Hey..!!
Practice
Select topics and difficulty and just practice mcqs.
Topics
Water Treatment
Topics
User (name or email)
Users
pick difficulty level
all
1
2
3
4
5
number of questions
10
30
50
70
100
Start
Let's practice 30 mcqs on
Water Treatment
mcqs by everyone
Application of quaternary ammonium compounds as sanitizing agents tends to
None of the above
decrease gram positive bacteria
favor gram positive bacteria
increase the percentage of gram(-)ve rods on utensils
Temporary hardness of water is caused by the presence of
sulfates of calcium and magnesium
chlorides of calcium and magnesium
carbonates of sodium and potassium
bicarbonates of calcium and magnesium
The maximum desirable limit Bureau of Indian Standards
(BIS) of lead in the drinking water is
0.1 mg/l
0.09 mg/l
0.05 mg/l
1.0 mg/l
Conventional tertiary treatment is
chemical coagulation and flocculation
NONE OF THESE
Sedimentation
Filtration
Sedimentation is a physical process used in wastewater treatment to
remove the pertinacious material from the water
None of the above
remove particles that are more dense than water
remove particles that are less dense than water
Hardness of water does not
cause difficulty in the washing of clothes with soaps
make it unfit for drinking
make cooking of foods difficult
have any bad effect in boiler
Coliform bacteria in water is an indication of the presence of
human feces
radioactive wastes
decaying animals and plants
excess fertilizer
The common methods used for disinfection in waste water treatment plants are
UV light
Phenolic solvent
Chlorination
Both (a) and (b)
Both temporary and permanent hardness of water can be removed on boiling water with
calcium carbonate
Calcium hydroxide
calcium oxide
Sodium Carbonate
The water being used in dairy industry should contain not more than
20 proteolytic and/or lipolytic organisms/ml
15 proteolytic and/or lipolytic organisms per ml
10 proteolytic and/or lipolytic organisms per ml
5 proteolytic and/or lipolytic organisms per ml
Which of the following chemical is sometime added in the process of coagulation and flocculation
Aluminum oxide
Aluminum sulphate
NONE OF THESE
Calcium chloride
Zeolite softening process removes
both temporary and permanent hardness of water
only temporary hardness of water
only permanent hardness of water
the dissolved gases in permanent hard water
Inhibitors are used along with sanitizer to
NONE OF THESE
improve their action
to prevent corrosion
Both (a) and (b)
From the following sanitizers which one comes under category of surface active agents
NONE OF THESE
Teepol
Tetra phosphate
Meta phosphate
Zeolite softening process removes both temporary and permanent hardness ofwater.
In this process the calcium and magnesium present in water are precipitated as
insoluble zeolites
insoluble carbonates
insoluble sulfates
insoluble chlorides
The methods used for biological treatment are
All of These
oxidation ditches
Lagoon
activated sludge process
BOD stands for
british oxygen depletion
biological oxygen depletion
british oxygen demand
biochemical oxygen demand
The activated sludge process is sometime referred as
fluid bed biological oxidation system
fixed bed biological oxidation system
turning bed biological oxidation system
None of the above
Lagoons may be characterized as
aerated
facultative
Anaerobic
All of These
Sanitizer used specifically for vitreous enamel are
NONE OF THESE
strong alkalis
strong acids
Acid used mostly for removal of milk stone is
Nitric acid
Phosphoric acid
tartaric acid
Gluconic acid
Biological oxidation processes usually referred as biological treatment, are the most common form of
All of These
primary treatment
secondary treatment
tertiary treatment
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 sulfate solution
10% calcium chloride solution
10% sodium chloride solution
10% magnesium chloride solution
The maximum desirable limit
(BIS) of total hardness
(as CaCo3) in drinking water is
500 ppm
600 ppm
300 ppm
1000 ppm
Calgon is used for removal of
Sodium Carbonate
NONE OF THESE
permanent hardness of water
Potassium carbonate
Both temporary and permanent hardness of water can be removed by
Boiling
Distillation
Filtration
decantation
According to BIS the maximum permissible limit of dissolved solids in drinking water is
1000 mg/l
500 mg/l
2000 mg/l
1500 mg/l
The chemical oxygen demand
(COD)measures the
amount of oxygen that would be removed from the water in order to oxidize pollution
amount of oxygen required to oxidize the calcium present in waste water
None of the above
amount of oxygen required for growth of microorganisms in water
The ultimate source of water is
underground and surface
rain and snow
dew and forest
rivers and lakes
Secondary treatment uses __________ to consume wastes
Filtration
micro-organisms
NONE OF THESE
Chemicals
Learn
Correct Attempts
Score
00/00
in
00:00