Hardness of Water MCQ Multiple Choice Questions Answers

Q: 2. Biological oxidation processes usually referred as biological treatment, are the most common form of

Correct Answer is: all of the above

Q: 3. Blow – down operation cause the removal of

Correct Answer is: sodium chloride

Q: 6. Calgon is the trade name given to

Correct Answer is: Calcium phosphate

Q: 7. Calgon is used for the removal of

Correct Answer is: none of these

Q: 8. Caustic embrittlement can be avoided by using

Correct Answer is: sodium sulphate

Q: 9. Caustic embrittlement is a type of

Correct Answer is: sludge formation.

Q: 11. Estimation of hardness of water by EDTA method is used to determine

Correct Answer is: Permanent hardness only

Q: 12. Hard water can be softened by passing it through

Correct Answer is: sodium silicate

Q: 13. Hard water is unfit for use in boilers for generating steam because

Correct Answer is: Water decomposes into O2 and H2

Q: 14. Hardness in water is caused due to the presence of

Correct Answer is: Undissolved CaCO 3

Hardness of Water MCQs are essential for students and exam aspirants to test and enhance their understanding of water quality and treatment. Practice these questions to improve your knowledge and prepare effectively for exams and interviews.

About Hardness of Water MCQ Questions

Hardness of Water MCQs cover key concepts such as the types of hardness (temporary and permanent), methods of measuring water hardness, and the impact of hard water on various household and industrial processes. These questions also delve into the chemical reactions and treatments used to reduce water hardness.

Why Practice Hardness of Water Objective Questions?

Practicing Hardness of Water MCQs is crucial for exam preparation, as it helps reinforce your understanding of the subject. These questions are beneficial for both formative and summative assessments. They also prepare you for competitive exams and job interviews by enhancing your problem-solving skills and knowledge retention.

Who Should Use These MCQs?

Hardness of Water MCQ Questions for Practice

1. A water sample found to possess 16.2 mg/L of Ca(HCO₃)₂. Its hardness in terms of CaCO₃ equivalents is

100
10
16.2
1000

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

Primary treatment
secondary treatment
Tertiary treatment
all of the above

3. Blow – down operation cause the removal of

Scales
sludges
acidity
sodium chloride

4. Boiler corrosion caused by using high alkaline water in a boiler is called

Corrosion
boiler corrosion
caustic embrittlement
erosion

5. Brackish water mainly contains

Calcium salts
Magnesium salts
Turbidity
sodium chloride

6. Calgon is the trade name given to

Sodium silicate
Sodium hexa meta phosphate
Sodium meta phosphate
Calcium phosphate

7. Calgon is used for the removal of

Sodium carbonate
permanent hardness of water
Hardness of water
none of these

8. Caustic embrittlement can be avoided by using

Sodium phosphate
hydrogen
ammonium hydroxide
sodium sulphate

9. Caustic embrittlement is a type of

Boiler corrosion
conditioning
scale formation
sludge formation.

10. Disinfection by ozone is due to liberation of

Oxygen
nascent Oxygen
Molecular Oxygen
oxide

11. Estimation of hardness of water by EDTA method is used to determine

Alkaline hardness
temporary hardness only
Permanent hardness only
all the above

12. Hard water can be softened by passing it through

Lime stone
sodium hexa meta phosphate
Ion â€“ exchange resin
sodium silicate

13. Hard water is unfit for use in boilers for generating steam because

Its boiling point is high
Hard water does not produce lather inside boiler
Water decomposes into O2 and H2
It produces scales inside the boiler

14. Hardness in water is caused due to the presence of

Undissolved salts of Ca²⁺ and Mg²⁺
Dissolved sulfates of Potassium
Dissolved salts of Ca²⁺ and Mg²⁺
Undissolved CaCO₃

15. Hardness of water does not

Have any bad effect in boiler
make cooking of food difficult
Make it unfit for drinking
cause difficulty in washing clothes with soaps.

16. Hardness of water is expressed in equivalents of

CaCO₃
MgCO₃
Ca(HCO₃)₂
Mg(HCO³)²

17. Hardness of water is measured in

Degree Clarke
ppm
degree French
mg /L

18. Liquid chlorine is a most effective

Disinfectant
coagulant
floculant
sterilizing agent

19. One of the following chemical acts as both coagulant and softening agent

Lime
soda
soda
sodium aluminate

20. One of the following is an example for cation exchanging resin

Copolymer of phenol formaldehyde â€“ amine formaldehyde
Copolymer of styrene â€“ divinyl benzene
Copolymer of phenol formaldehyde and styrene
Copolymer of amine formaldehyde and divinely benzene

21. One part of CaCO₃ equivalent hardness per 10⁵ parts of water is called

Degree Clarke
ppm
degree French
mg /L

22. Permanent hardness in water is caused by the presence of

Bicarbonates of calcium and magnesium
Carbonates of sodium and potassium
Chlorides of sulfates and calcium and magnesium
Phosphates of sodium and potassium

23. Solubility of calcium sulphate in water is

Increase with rise of temperature
Decreases with rise of temperature
Remains unaltered with rise of temperature
Does not adopt any definite pattern with rise of temperature.

24. Temporary hardness in water is removed by

Filtration
Sedimentation
Boiling
coagulation.

25. Temporary hardness of water is caused by the presence of

Chlorides of calcium and magnesium
Sulfates of calcium and magnesium
Bicarbonates of calcium and magnesium
Carbonates of calcium and magnesium.

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

Chlorination
UV light
Both a & b
Phenolic solvent

27. The external treatment of boiler feed water is done by

Lime â€“ soda process
sodium sulphate treatment
Calgon process
sodium aluminate treatment.

28. The formula of chloramine is

ClNH₂
NHCl₂
NCl₃
NH₂Cl₂

29. The hardness of water in CaCO₃ equivalents containing MgSO₄ (Mol. Wt = 120) with concentration of 12 mg/ L is

100 mg/L
10 mg/L
5 mg/L
1 mg/L

Hardness of Water MCQ Multiple Choice Questions Answers | Quiz for Practice

About Hardness of Water MCQ Questions

Why Practice Hardness of Water Objective Questions?

Who Should Use These MCQs?

Hardness of Water MCQ Questions for Practice

1. A water sample found to possess 16.2 mg/L of Ca(HCO₃)₂. Its hardness in terms of CaCO₃ equivalents is

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

3. Blow – down operation cause the removal of

4. Boiler corrosion caused by using high alkaline water in a boiler is called

5. Brackish water mainly contains

6. Calgon is the trade name given to

7. Calgon is used for the removal of

8. Caustic embrittlement can be avoided by using

9. Caustic embrittlement is a type of

10. Disinfection by ozone is due to liberation of

11. Estimation of hardness of water by EDTA method is used to determine

12. Hard water can be softened by passing it through

13. Hard water is unfit for use in boilers for generating steam because

14. Hardness in water is caused due to the presence of

15. Hardness of water does not

16. Hardness of water is expressed in equivalents of

17. Hardness of water is measured in

18. Liquid chlorine is a most effective

19. One of the following chemical acts as both coagulant and softening agent

20. One of the following is an example for cation exchanging resin

21. One part of CaCO₃ equivalent hardness per 10⁵ parts of water is called

22. Permanent hardness in water is caused by the presence of

23. Solubility of calcium sulphate in water is

24. Temporary hardness in water is removed by

25. Temporary hardness of water is caused by the presence of

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

27. The external treatment of boiler feed water is done by

28. The formula of chloramine is

29. The hardness of water in CaCO₃ equivalents containing MgSO₄ (Mol. Wt = 120) with concentration of 12 mg/ L is

30. The hardness of water sample is 10 ppm, which can be expressed as.............degree Clarke.

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Hardness of Water MCQ Multiple Choice Questions Answers | Quiz for Practice

About Hardness of Water MCQ Questions

Why Practice Hardness of Water Objective Questions?

Who Should Use These MCQs?

Hardness of Water MCQ Questions for Practice

1. A water sample found to possess 16.2 mg/L of Ca(HCO3)2. Its hardness in terms of CaCO3 equivalents is

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

3. Blow – down operation cause the removal of

4. Boiler corrosion caused by using high alkaline water in a boiler is called

5. Brackish water mainly contains

6. Calgon is the trade name given to

7. Calgon is used for the removal of

8. Caustic embrittlement can be avoided by using

9. Caustic embrittlement is a type of

10. Disinfection by ozone is due to liberation of

11. Estimation of hardness of water by EDTA method is used to determine

12. Hard water can be softened by passing it through

13. Hard water is unfit for use in boilers for generating steam because

14. Hardness in water is caused due to the presence of

15. Hardness of water does not

16. Hardness of water is expressed in equivalents of

17. Hardness of water is measured in

18. Liquid chlorine is a most effective

19. One of the following chemical acts as both coagulant and softening agent

20. One of the following is an example for cation exchanging resin

21. One part of CaCO3 equivalent hardness per 105 parts of water is called

22. Permanent hardness in water is caused by the presence of

23. Solubility of calcium sulphate in water is

24. Temporary hardness in water is removed by

25. Temporary hardness of water is caused by the presence of

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

27. The external treatment of boiler feed water is done by

28. The formula of chloramine is

29. The hardness of water in CaCO3 equivalents containing MgSO4 (Mol. Wt = 120) with concentration of 12 mg/ L is

30. The hardness of water sample is 10 ppm, which can be expressed as.............degree Clarke.

Your Score

Related Quiz Topics

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1. A water sample found to possess 16.2 mg/L of Ca(HCO₃)₂. Its hardness in terms of CaCO₃ equivalents is

21. One part of CaCO₃ equivalent hardness per 10⁵ parts of water is called

29. The hardness of water in CaCO₃ equivalents containing MgSO₄ (Mol. Wt = 120) with concentration of 12 mg/ L is