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Water Treatment MCQ Questions & Answers

Water Treatment MCQs : This section focuses on the "Water Treatment". These Multiple Choice Questions (MCQs) should be practiced to improve the Water Treatment skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.




Question 1

Calgon is used for removal of

A. sodium carbonate
B. permanent hardness of water
C. potassium carbonate
D. none of these

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Question 2

Biological oxidation processes usually referred as biological treatment, are the most common form of

A. primary treatment
B. secondary treatment
C. tertiary treatment
D. all of these

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Question 3

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

View Answer

Question 4

Both temporary and permanent hardness of water can be removed by

A. boiling
B. distillation
C. filtration
D. decantation

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Question 5

Inhibitors are used along with sanitizer to

A. improve their action
B. to prevent corrosion
C. Both A and B
D. None of the above

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Question 6

What is the highest enthalpy of adsorption for chemical adsorption?

A. 100 KJ mol-1
B. 200 KJ mol-1
C. 300 KJ mol-1
D. 400 KJ mol-1

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Question 7

The activated sludge process consists of returning a portion of the clarifier

A. effluent water entering the reactor
B. influent water coming out of the reactor
C. influent water entering the reactor
D. effluent water coming out of the reactor

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Question 8

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

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Question 9

Coliform bacteria in water is an indication of the presence of

A. radioactive wastes
B. excess fertilizer
C. decaying animals and plants
D. human feces

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Question 10

According to BIS the maximum permissible limit of dissolved solids in drinking water is

A. 1000 mg/l
B. 500 mg/l
C. 2000 mg/l
D. 1500 mg/l

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Question 11

The common methods used for disinfection in waste water treatment plants are

A. chlorination
B. UV light
C. Both A and B
D. Phenolic solvent

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Question 12

Physical adsorption ________ with increase in temperature.

A. Decreases
B. Increases
C. Remains same
D. Fluctuates

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Question 13

Which of the following chemical is sometime added in the process of coagulation and flocculation?

A. Aluminum sulphate
B. Aluminum oxide
C. Calcium chloride
D. None of these

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Question 14

The methods used for biological treatment are

A. lagoon
B. activated sludge process
C. oxidation ditches
D. all of these

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Question 15

BOD stands for

A. biochemical oxygen demand
B. british oxygen demand
C. british oxygen depletion
D. biological oxygen depletion

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Question 16

Which of the following physical method is used as germicidal in modern time for the treatment of drinking water?

A. Chlorination
B. Treating with potassium permagnate
C. UV radiation
D. Treating with bleaching powder

View Answer

Question 17

The maximum desirable limit Bureau of Indian Standards (BIS) of lead in the drinking water is

A. 0.05 mg/l
B. 0.09 mg/l
C. 0.1 mg/l
D. 1.0 mg/l

View Answer

Question 18

Lagoons may be characterized as

A. anaerobic
B. facultative
C. aerated
D. all of these

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Question 19

Sedimentation is a physical process used in wastewater treatment to

A. remove particles that are less dense than water
B. remove particles that are more dense than water
C. remove the pertinacious material from the water
D. None of the above

View Answer

Question 20

Hardness of water does not

A. have any bad effect in boiler
B. make cooking of foods difficult
C. make it unfit for drinking
D. cause difficulty in the washing of clothes with soaps

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Question 21

The water being used in dairy industry should contain not more than

A. 5 proteolytic and/or lipolytic organisms per ml
B. 10 proteolytic and/or lipolytic organisms per ml
C. 15 proteolytic and/or lipolytic organisms per ml
D. 20 proteolytic and/or lipolytic organisms/ml

View Answer

Question 22

Which of the following substances are commonly used in a filter?

A. Charcoal
B. Sand
C. Both A and B
D. Aluminum chloride

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Question 23

Secondary treatment uses __________ to consume wastes.

A. micro-organisms
B. chemicals
C. filtration
D. none of these

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Question 24

The maximum desirable limit (BIS) of total hardness (as CaCo3) in drinking water is

A. 600 ppm
B. 300 ppm
C. 500 ppm
D. 1000 ppm

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Question 25

Chemical adsorption takes place at high temperature.

A. True
B. False

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Question 26

Sanitizers used for rubber made equipments are

A. strong acids
B. strong alkalis
C. combination of both
D. none of these

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Question 27

Which force holds the molecules in physical adsorption?

A. Friction force
B. Van der waals force
C. Tension force
D. Nuclear force

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Question 28

Temporary hardness of water may be removed by adding

A. calcium hydroxide
B. calcium carbonate
C. calcium chloride
D. sodium bicarbonate

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Question 29

The activated sludge process is sometime referred as

A. fluid bed biological oxidation system
B. fixed bed biological oxidation system
C. turning bed biological oxidation system
D. none of the above

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Question 30

When temporary hard water is boiled, one of the substances formed is

A. calcium bicarbonate
B. calcium sulfate
C. hydrogen chloride
D. carbon dioxide

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Question 31

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

A. 10% calcium chloride solution
B. 10% magnesium sulfate solution
C. 10% magnesium chloride solution
D. 10% sodium chloride solution

View Answer

Question 32

Chemical adsorption is also called as _____

A. Sorption
B. Chemisorption
C. Chemiption
D. Chemical sorption

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Question 33

The maximum permissible limit (BIS) of turbidity in drinking water is

A. 5 NTU
B. 10 NTU
C. 15 NTU
D. 20 NTU

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Question 34

Zeolite softening process removes

A. only temporary hardness of water
B. only permanent hardness of water
C. both temporary and permanent hardness of water
D. the dissolved gases in permanent hard water

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Question 35

Sanitizer used specifically for vitreous enamel are

A. strong alkalis
B. strong acids
C. weak alkali with sodium silicate
D. none of these

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Question 36

Conventional tertiary treatment is

A. chemical coagulation and flocculation
B. filtration
C. sedimentation
D. None of the above

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Question 37

Which of the following chemical is sometime added in the process of coagulation and flocculation?

A. Aluminum sulphate
B. Aluminum oxide
C. Calcium chloride
D. None of the above

View Answer

Question 38

Inhibitors are used along with sanitizer to

A. improve their action
B. to prevent corrosion
C. both (a) and (b)
D. none of these

View Answer

Question 39

Sanitizer used specifically for vitreous enamel are

A. strong alkalis
B. strong acids
C. weak alkali with sodium silicate
D. None of the above

View Answer

Question 40

Temporary hardness of water is caused by the presence of

A. chlorides of calcium and magnesium
B. sulfates of calcium and magnesium
C. bicarbonates of calcium and magnesium
D. carbonates of sodium and potassium

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Question 41

Application of quaternary ammonium compounds as sanitizing agents tends to

A. favor gram positive bacteria
B. decrease gram positive bacteria
C. increase the percentage of gram(-)ve rods on utensils
D. None of the above

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Question 42

Permanent hardness of water may be removed by the addition of

A. lime
B. soda ash
C. potassium permagnate
D. sodium bicarbonate

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Question 43

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

View Answer

Question 44

The common methods used for disinfection in waste water treatment plants are

A. chlorination
B. UV light
C. both (a) and (b)
D. Phenolic solvent

View Answer

Question 45

Biological oxidation processes usually referred as biological treatment, are the most common form of

A. primary treatment
B. secondary treatment
C. tertiary treatment
D. All of the above

View Answer

Question 46

Which of the following substances are commonly used in a filter?

A. Charcoal
B. Sand
C. Both (a) and (b)
D. Aluminum chloride

View Answer

Question 47

Secondary treatment uses __________ to consume wastes.

A. micro-organisms
B. chemicals
C. filtration
D. None of the above

View Answer

Question 48

Conventional tertiary treatment is

A. chemical coagulation and flocculation
B. filtration
C. sedimentation
D. none of these

View Answer

Question 49

What is the lowest enthalpy of adsorption for physical adsorption?

A. 5 KJ mol-1
B. 10 KJ mol-1
C. 15 KJ mol-1
D. 25 KJ mol-1

View Answer

Question 50

Zeolite softening process removes both temporary and permanent hardness of water. In this process the calcium and magnesium present in water are precipitated as

A. insoluble carbonates
B. insoluble zeolites
C. insoluble chlorides
D. insoluble sulfates

View Answer

Question 51

Acid used mostly for removal of milk stone is

A. phosphoric acid
B. nitric acid
C. gluconic acid
D. tartaric acid

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Question 52

The chemical oxygen demand (COD)measures the

A. amount of oxygen required for growth of microorganisms in water
B. amount of oxygen that would be removed from the water in order to oxidize pollution
C. amount of oxygen required to oxidize the calcium present in waste water
D. None of the above

View Answer

Question 53

Permanent hard water may be softened by passing it through

A. sodium silicate
B. sodium bicarbonate
C. sodium hexametaphosphate
D. sodium phosphate

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Question 54

Sanitizers used for rubber made equipments are

A. strong acids
B. strong alkalis
C. combination of both
D. None of the above

View Answer

Question 55

Physical adsorption is also called as _________

A. Adsorption
B. Absorption
C. Physisorption
D. Sorption

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Question 56

The ultimate source of water is

A. rivers and lakes
B. dew and forest
C. rain and snow
D. underground and surface

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Question 57

Adsorption is an endothermic process.

A. True
B. False

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Question 58

The purest form of naturally occurring water is

A. rain water
B. river water
C. pond water
D. well water

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Question 59

Permanent hardness of water is caused by the presence of

A. bicarbonates of calcium and magnesium
B. carbonates of sodium and potassium
C. chlorides and sulfates of calcium and magnesium
D. phosphates of sodium and potassium

View Answer