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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

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 2

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

View Answer

Question 3

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

View Answer

Question 4

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 5

Secondary treatment uses __________ to consume wastes.

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

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Question 6

Both temporary and permanent hardness of water can be removed by

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

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Question 7

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 8

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 9

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

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Question 10

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 11

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

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Question 12

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 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

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 15

Lagoons may be characterized as

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

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Question 16

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 17

Secondary treatment uses __________ to consume wastes.

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

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Question 18

Conventional tertiary treatment is

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

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Question 19

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

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Question 20

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 21

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

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Question 22

Conventional tertiary treatment is

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

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Question 23

Sanitizer used specifically for vitreous enamel are

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

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Question 24

Chemical adsorption takes place at high temperature.

A. True
B. False

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Question 25

BOD stands for

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

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Question 26

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

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Question 27

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 28

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 29

Adsorption is an endothermic process.

A. True
B. False

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Question 30

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 31

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 32

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

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Question 33

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 34

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 35

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 36

Sanitizers used for rubber made equipments are

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

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Question 37

Physical adsorption ________ with increase in temperature.

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

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Question 38

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 39

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 40

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 41

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 42

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 43

Chemical adsorption is also called as _____

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

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Question 44

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 45

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 46

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

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Question 47

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 48

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

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Question 49

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 50

Temporary hardness of water may be removed by adding

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

View Answer

Question 51

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 52

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 53

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

View Answer

Question 54

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

View Answer

Question 55

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

View Answer

Question 56

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

View Answer

Question 57

Physical adsorption is also called as _________

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

View Answer

Question 58

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

View Answer

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