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CHAPTER 3 WATER MCQ

Total questions: 96

Worksheet time: 48mins

Name
Class
Date
1.

Temporary hard water contain-------and Permanent hard water contains -------

a)

bicarbonates of Ca and Mg

b)

chlorides and sulphates of Ca and Mg

c)

Option A and B

d)

chlorides and sulphates of Au and Ag

2.

Hard water contains the salts of Ca and Mg. If hard water is used for drinking it causes stone in kidney.

a)

A is correct

b)

B is correct

c)

Both are correct

d)

Both are wrong

3.

ClNH2 + H2O ----> ? + ?

a)

NH4,H2O

b)

H2O, NH4Cl

c)

Cl2,NH4Cl

d)

HOCl,NH3

4.

Permanent hard water can be softened by-------method

a)

Clarks method

b)

Permutit method

c)

Ion exchange method

d)

Permutit and Ion exchange method

5.

Suspended impurities can be removed by-------method.

a)

Sedimentation

b)

floating

c)

Aeration

d)

Coagulation

6.

What are the factors affecting water quality?

a)

dissolved gases and salts,acidity and alkalinity of water

b)

dissolved salts and minerals

c)

acidity and alkalinity of water salts

d)

dissolved gases and salts

7.

Water which does not produce lather but produce white curd with soap solution is known as -------

a)

Hard water

b)

Basic water

c)

Soft water

d)

Acidic water

8.

During aeration process water comes in contact with these two things -------

a)

Sunlight and Oxygen of air

b)

moisture and dust

c)

dust and dirt

d)

oxygen and carbondioxid

9.

The process in which water in the form of fine droplets spread into atmosphere is known as -------

a)

Sedimentation

b)

Coagulation

c)

Ozonization

d)

Aeration

10.

Temporary hard water contain-------and Permanent hard water contains -------

a)

bicarbonates of Ca and Mg

b)

chlorides and sulphates of Ca and Mg

c)

Option 1 and 2

d)

chlorides and sulphates of Au and Ag

11.

The formula of bleaching powder is -------

a)

Ca2OCl2

b)

CaOCl2

c)

CaOCl

d)

CaCl

12.

Scale and sludge formation in boiler is not responsible for-------

a)

Abrasion

b)

Wastage of fuel

c)

Danger of explosion

d)

Decrease in Energy Efficiency

13.

Highly alkaline water in boiler causes -------

a)

corrosion

b)

scale and sludge formation

c)

priming and foaming

d)

caustic embrittlement

14.

The principle of chlorination is -------

a)

formation of nascent oxygen

b)

formation of oxygen molecule

c)

formation of chlorine gas

d)

formation of hydrochloric acid

15.

The unpleasant odour of the treated water is due to presence of the -------

a)

excess of chlorine content

b)

Dissolved oxygen

c)

Dissolved nitrogen

d)

excess of oxygen

16.

In chlorination method chlorine gas react with water to form-------

a)

Hydrochloric acid

b)

Nitric acid

c)

Hypochlorous acid

d)

Acetic acid

17.

In chlorination of water------- acts as powerful germicide.

a)

Hypochlorous acid

b)

Chlorine

c)

HCl

d)

None of these

18.

coagulant like alum is added to water to remove -------

a)

biological impurities

b)

floating materials

c)

colloidal impurities

d)

all of these

19.

In coagulation process, the colloidal impurities present in hard water are removal by addition of -------

a)

Aluminium sulphate

b)

calcium sulphate

c)

copper sulphate

d)

magnesium sulphate

20.

Name the coagulant used in city water supply for purification of water.

a)

Alum and FeSO4

b)

CaOCl2

c)

NaCl

d)

Ca(OH)2

21.

The very fine suspended impurities in water can be removed by-------method.

a)

Screening

b)

Sedimentation

c)

Coagulation

d)

Filtration

22.

The metallic constituent of hard water are -------

a)

magnesium, tin and iron

b)

calcium ,magnesium and iron

c)

Iron , tin and Calcium

d)

magnesium calcium and tin

23.

Ca and Mg salts in hard water increases the------- of water.

a)

Melting point

b)

Boiling point

c)

Freezing point

d)

None of these

24.

In Ion exchange process cation exchange resin is regenerated by using -------

a)

HCl

b)

Brine solution

c)

zeolite

d)

NaOH

25.

In Ion exchange process anion exchange resin is regenerated by using -------

a)

HCl

b)

Brine solution

c)

zeolite

d)

NaOH

26.

Ion exchange process is -------

a)

cheaper

b)

costly

c)

Time taking

d)

hard process

27.

In ion exchange process, formula of anion exchange resins is -------

a)

\R(OH)_{2}\N

b)

RMg

c)

RCa

d)

\RH_{2}\N

28.

In chlorination process germs are killed by -------

a)

chlorine gas

b)

chloramine

c)

bleaching powder

d)

all of these

29.

In ion exchange process, formula of cation exchange resins is -------

a)

\R(OH)_{2}\N

b)

RMg

c)

RCa

d)

\RH_{2}\N

30.

The removal of salts present in water by ion exchange process is known as -------

a)

dehydration

b)

dehydrogenation

c)

demineralisation

d)

none of above

31.

Softened water obtained by process of cold lime soda continuous process having hardness -------

a)

25 - 30 ppm

b)

70 - 80 ppm

c)

50 - 60 ppm

d)

30 - 40 ppm

32.

Softened water obtained by process of hot lime soda continuous process having hardness -------

a)

35 ppm

b)

50 ppm

c)

60 ppm

d)

25 ppm

33.

In soda lime process, precipitate formed is known as -------

a)

slag

b)

sludge or flock

c)

flux

d)

gangue

34.

Permanent hardness is also known as -------

a)

carbonate hardness

b)

non carbonate hardness

c)

both A and B

d)

none of these

35.

In ozonization-------is used to sterilize water.

a)

Oxygen gas

b)

ozone gas

c)

solid Ozone

d)

chlorine gas

36.

Permanent hardness of water is caused by the presence of -------

a)

bicarbonates of calcium and magnesium

b)

chlorides and sulphates of calcium and magnesium

c)

carbonate of sodium and potassium

d)

phosphate of sodium and potassium

37.

Permanent hardwater contains impurities of -------

a)

Magnesium sulphate

b)

Magnesium bicarbonate

c)

calcium bicarbonate

d)

Calcium carbonate

38.

Ozone acts as -------

a)

demineralising agents

b)

deodourising agents

c)

clearing agent

d)

sterilizing agent.

39.

Among the following salts which salt does not causes permanent hardness in water?

a)

Bicarbonates of Ca and Mg.

b)

Magnesium sulphate

c)

Magnesium chloride

d)

Calcium chloride

40.

In permutit process, when the permutits are exhausted these can be regenerated by addition of -------

a)

Aniline

b)

saline

c)

brine solution

d)

alum solution

41.

For domestic use, water must be -------

a)

sparkling

b)

free from salts

c)

hygienically pure

d)

free from chlorine

42.

At a water treatment plant one of the stages in which water is passing through a bed of sand and gravel this treatment is called as -------

a)

coagulation

b)

filtration

c)

sedimentation

d)

sterilization

43.

------- is the process in which small particles allow to settle at the bottom of the tank.

a)

filtration

b)

sterilization

c)

sedimentation

d)

coagulation

44.

The floating material present in water is removed by -------

a)

sedimentation

b)

screening

c)

coagulation

d)

filtration

45.

The organic polymeric compound which has tendency to exchange ions if used for removal of hardness of water is called -------

a)

Resin

b)

Complex

c)

Element

d)

Solute

46.

A hard precipitate is formed on inner surface of boiler is called -------

a)

Matrix

b)

scales

c)

Sludge

d)

slag

47.

Screening is the process of removing-------from water.

a)

scale and sludge

b)

floating material

c)

suspended particles

d)

hardness

48.

Permanent hardness cannot be removed by-------method.

a)

boiling

b)

ion exchange process

c)

Permutit Process

d)

Soda and Lime

49.

Hard water produces curd like precipitate is known as -------

a)

Salt

b)

Gas

c)

Scum

d)

None of these

50.

The suspended impurities present in water is removed by -------

a)

coagulation

b)

filtration

c)

sedimentation

d)

sterilization

51.

The chemical name of slake lime is-------

a)

Calcium carbonate

b)

Calcium oxide

c)

calcium bicarbonate.

d)

Calcium hydroxide

52.

A soft, loose and slimy precipitates formed with in the boiler known as ----

a)

Sludge

b)

slag

c)

flux

d)

gangue

53.

The chemical formula of soda ash is -------

a)

NaOH

b)

Na_{2}CO_{3}

c)

NaCl

d)

CA(OH)_{2}

54.

Water which produces lather with soap solution is known as -------

a)

Hard water

b)

Basic water

c)

Soft water

d)

acidic water

55.

Permanent hardness of water can be removed by the addition of-------

a)

citric acid

b)

soda lime

c)

potassium permanganate

d)

Sodium Bicarbonate

56.

The process of removing calcium and magnesium salts from hard water is known as ________.

a)

filtration

b)

flocculation

c)

sedimentation

d)

water softening

e)

water softening

57.

_______ is use for softening hard water?

a)

Ion exchange method

b)

Zeolite method

c)

Lime soda method

d)

All of above

e)

All of above

58.

_______ methods does not removes hardness of water?

a)

Clarks method

b)

Washing soda method

c)

Zeolite method

d)

Filtration

e)

Filtration

59.

The disadvantage of hard water is ________.

a)

More soap consumption and demineralisation

b)

Scale formation in boiler and water purification

c)

Scale formation in boiler and corrosion of pipes

d)

Lather formation and more soap consumption

e)

Scale formation in boiler and corrosion of pipes

60.

Dissolved bicarbonates in water can be removed by ------- method.

a)

Boiling

b)

UV rays

c)

Coagulation

d)

Sedimentation

e)

Boiling

61.

Temporary hard water contains impurities of ________.

a)

Calcium chloride

b)

Magnesium chloride

c)

Calcium sulphate

d)

Magnesium bicarbonate

e)

Magnesium bicarbonate

62.

_______ salts are present in temporary hard water?

a)

Bicarbonates of Ca and Mg.

b)

Carbonates of Ca and Mg.

c)

Sulphates of Ca and Mg.

d)

Chlorides of Ca and Mg.

e)

Bicarbonates of Ca and Mg.

63.

The modern system used to express the hardness of water is ________.

a)

degree clark

b)

degree french

c)

milligrams per litre

d)

parts per million

e)

parts per million

64.

_______ method is used as a sterilization method for swimming pool water.

a)

chlorination

b)

UV radiation

c)

treating with potassium permanganate

d)

heating with bleaching powder

e)

UV radiation

65.

Sterilization of water can be done by ________.

a)

chlorination and sedimentation

b)

aeration and fermentation

c)

using UV rays and adding lime

d)

chlorination and boiling

e)

chlorination and boiling

66.

Which of the following impurity present in water.

a)

Suspended impurity

b)

Dissolved impurity

c)

Colloidal impurity

d)

All of the above

e)

All of the above

67.

Temporary hardness of water can by removed by ________.

a)

Cooling

b)

boiling

c)

Filtering

d)

Sedimentation (or decanting)

e)

boiling

68.

Corrosion of boiler due to dissolved oxygen is removed by addition of ________.

a)

hydrazine

b)

sodium chloride

c)

sodium hydroxide

d)

potassium hydroxide

e)

hydrazine

69.

Sludges are formed due to presence of impurities of ________.

a)

MgCO3

b)

MgCl2

c)

MgSO4

d)

all of the above

e)

all of the above

70.

In soda-lime process, lime used having chemical formula ________.

a)

CaCO3

b)

CaO

c)

Ca(OH)2

d)

Ca(OH)2

e)

Ca(OH)2

71.

In soda-lime process, the substance used to collect the precipitate is ________.

a)

alum

b)

resin

c)

hydrazine

d)

saline

e)

alum

72.

In zeolite process, for softening of water the zeolite having chemical formula ________.

a)

CaP

b)

Na2P

c)

MgP

d)

None of these

e)

Na2P

73.

In permutit process, permutits are regenerated by addition of ________.

a)

Analine

b)

Saline

c)

brine solution

d)

alum

e)

Brine solution

74.

The colloidal impurities present in water are removed by ________.

a)

sedimentation

b)

filtration

c)

coagulation

d)

sterilization

e)

coagulation

75.

The process of destroying the disease producing bacteria and microorganism is known as ________.

a)

Iodization

b)

sterilization

c)

dissociation

d)

ionisation

e)

sterilization

76.

During ozonisation of water, ozone decomposes to form ________.

a)

oxygen molecules

b)

nascent oxygen

c)

oxygen molecule and nascent oxygen

d)

nascent oxygen and nascent hydrogen

e)

oxygen molecule and nascent oxygen

77.

The process of removal of fine suspended particle by adding alum is known as ________.

a)

filtration

b)

sterilization

c)

sedimentation

d)

coagulation

e)

coagulation

78.

Zeolite process removes ________.

a)

only temporary hardness of water

b)

both temporary and permanent hardness of water

c)

only permanent hardness of water

d)

dissolved gases in permanent hard water

e)

both temporary and permanent hardness of water

79.

In Zeolite process, Zeolite bed is regenerated by adding ________.

a)

10% calcium chloride

b)

10% magnesium chloride

c)

10% magnesium sulphate

d)

10% NaCl

e)

10% NaCl

80.

Which of the following chemical is added in the process of coagulation?

a)

aluminium sulphate

b)

aluminium oxide

c)

calcium chloride

d)

none of these

81.

Which of the following methods are used for sterilization of water?

a)

chlorination

b)

UV radiation

c)

bleaching powder

d)

all of the above

82.

Sedimentation is used to remove -------

a)

colloidal particles

b)

suspended particles

c)

microorganisms

d)

all of these

83.

Permanent hardness of water can be removed by -------

a)

Ion exchange process

b)

Boiling

c)

Filtration

d)

Sedimentation

84.

The purest form of naturally occurring water is -------

a)

rain water

b)

river water

c)

sea water

d)

lake water

85.

Water which does not produce lather with soap is called -------

a)

hard water

b)

soft water

c)

distilled water

d)

mineral water

86.

Permanent hardness is the hardness that cannot be removed by -------

a)

boiling

b)

filtration

c)

distillation

d)

sedimentation

87.

In ion-exchange process, cation exchange resin is regenerated by using -------

a)

dilute acid

b)

dilute base

c)

concentrated salt solution

d)

distilled water

88.

In ion-exchange process, anion exchange resin is regenerated by using -------

a)

Base

b)

Acid

c)

Salt

d)

Water

89.

When soap is added to hard water, a white precipitate formed is known as -------

a)

scum

b)

salt

c)

lather

d)

foam

90.

Boilers do not face the trouble of ------- while using hard water to generate steam.

a)

lubrication

b)

scale formation

c)

corrosion

d)

priming

91.

Coagulation process removes -------

a)

colloidal particles

b)

dissolved gases

c)

heavy metals

d)

suspended solids

92.

Colloidal particles are responsible for -------

a)

turbidity of water

b)

hardness of water

c)

color of water

d)

boiling point of water

93.

Calculate carbonate hardness of water sample containing: Calcium bi-carbonate = 162 mg/lt (Mol.Wt : Calcium bi-carbonate = 162)

a)

0.15 ppm

b)

1.5 ppm

c)

15 ppm

d)

100 ppm

94.

Calculate non-carbonate hardness of water sample containing Magnesium chloride = 95 mg/lt (Mol.Wt : Magnesium chloride = 95 )

a)

2 ppm

b)

20 ppm

c)

100 ppm

d)

120 ppm

95.

A water sample contains 204 mg of calcium sulphate per litre. Calculate the hardness (Mol.wt. of calcium sulphate = 136)

a)

150 ppm

b)

15 ppm

c)

1.5 ppm

d)

0.15 ppm

96.

A water sample contains 168 mg of magnesium carbonate per litre. Calculate the hardness (Mol.wt. of magnesium carbonate = 84 )

a)

2 ppm

b)

20 ppm

c)

200 ppm

d)

120 ppm

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