MCQ quiz on Hardness of Water multiple choice questions and answers on Hardness of Water MCQ questions on Hardness of Water objectives questions with answer test pdf for interview preparations, freshers jobs and competitive exams. Professionals, Teachers, Students and Kids Trivia Quizzes to test your knowledge on the subject.

Hardness of Water Question and Answer

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

  1. 100
  2. 10
  3. 16.2
  4. 1000

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

  1. Primary treatment
  2. secondary treatment
  3. Tertiary treatment
  4. all of the above

3. Blow – down operation cause the removal of

  1. Scales
  2. sludges
  3. acidity
  4. sodium chloride

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

  1. Corrosion
  2. boiler corrosion
  3. caustic embrittlement
  4. erosion

5. Brackish water mainly contains

  1. Calcium salts
  2. Magnesium salts
  3. Turbidity
  4. sodium chloride

6. Calgon is the trade name given to

  1. Sodium silicate
  2. Sodium hexa meta phosphate
  3. Sodium meta phosphate
  4. Calcium phosphate

7. Calgon is used for the removal of

  1. Sodium carbonate
  2. permanent hardness of water
  3. Hardness of water
  4. none of these

8. Caustic embrittlement can be avoided by using

  1. Sodium phosphate
  2. hydrogen
  3. ammonium hydroxide
  4. sodium sulphate

9. Caustic embrittlement is a type of

  1. Boiler corrosion
  2. conditioning
  3. scale formation
  4. sludge formation.

10. Disinfection by ozone is due to liberation of

  1. Oxygen
  2. nascent Oxygen
  3. Molecular Oxygen
  4. oxide

MCQ Multiple Choice Questions and Answers on Hardness of Water

Hardness of Water Trivia Questions and Answers PDF Online

Hardness of Water Question and Answer

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