Hardness of Water MCQs Quiz Multiple Choice Questions & Answers

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Dive into the crucial topic of water hardness with our comprehensive collection of multiple-choice questions and answers! Explore the factors influencing water hardness, the effects on water quality, and methods of water treatment. Whether you're a student of environmental science, a water treatment professional, or simply interested in understanding the impact of water quality on daily life, our Hardness of Water MCQs page offers an engaging and educational experience. Test your knowledge, deepen your understanding, and unravel the mysteries of water hardness through our carefully crafted quizzes. Visit ObjectiveQuiz.com now to embark on a journey through the fascinating world of water chemistry!

Hardness of Water Questions with Answers

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.

31. The ion – exchange resins used for softening water are

32. The maximum desirable limits (as per BIS) of total hardness (as CaCO3) in drinking water is

33. The method by which ions are pulled out of salt water by direct current, and employing thin and rigid membrane is called

34. The process of allowing water to stand undisturbed in big tanks for settling of the suspended particles due to force of gravity

35. The process of wet steam formation is called

36. The purification of brackish water y reverse osmosis is also called as

37. The soft, loose and slimy precipitate formed within the boiler is called

38. Ultraviolet rays are used in the treatment of water for

39. Uneven deposition of turbines causes

40. When temporary hard water is boiled, one of the substance formed is

41. Which of the following chemical is sometimes added in the process of coagulation and flocculation.

42. Which of the following methods separates ionic and non – ionic impurities from water?

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

44. Which of the following salts cause least hardness to water when converted to CaCO3 equivalents?

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

46. Zeolite softening process removes

47. 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


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