This quiz works best with JavaScript enabled. Home > Water > Water Technology – Quiz 2 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Water Technology Quiz 2 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The exhausted cation exchange column is regenerated by passing a solution of ..... A) Conc. NaCl. B) Conc. HCl. C) Dil. HCl. D) Dil. NaCl. Show Answer Correct Answer: C) Dil. HCl. 2. Water softened by Deionisation process has residual hardness as -- A) >50 ppm. B) > 10 ppm. C) < 2 ppm. D) 100 ppm. Show Answer Correct Answer: C) < 2 ppm. 3. The amount of pressure to be applied in RO system is depends on ..... A) Organic content. B) Salt concentration. C) Bacteria. D) Membrane strenghth. Show Answer Correct Answer: B) Salt concentration. 4. When the impure water is passed through cation exchange resin, cation of impure water gets exchanged with A) OH- of anion. B) OH- of Cation. C) H+ of anion. D) H+ of cation. Show Answer Correct Answer: D) H+ of cation. 5. Ion exchange process is also called as ..... A) ) Lime soda process. B) Zeolite process. C) Demineralization. D) Permutit's process. Show Answer Correct Answer: C) Demineralization. 6. Which reagent is added in COD to combine with the chloride ions A) Magnesium sulphate. B) Mercuric sulphate. C) Lead sulphate. D) None of above. Show Answer Correct Answer: B) Mercuric sulphate. 7. In regeneration of cation exchange resin ----is used A) HCl, H2SO4 etc. B) NaOH, KOH etc. C) NaCl, Na2SO4 etc. D) Alcohols. Show Answer Correct Answer: A) HCl, H2SO4 etc. 8. Permanent hardness in water is caused by the presence of: A) Calcium bicarbonate. B) Magnesium sulfate. C) Both of them. D) None of them. Show Answer Correct Answer: B) Magnesium sulfate. 9. Resins after exhaustion can be regenerated by the addition of A) Water. B) Cations. C) HCl and NaOH solutions. D) Anions. Show Answer Correct Answer: C) HCl and NaOH solutions. 10. Boiler water is treated to prevent..... A) Scale. B) Oxygen pitting. C) Caustic embrittlement. D) All of the above. Show Answer Correct Answer: D) All of the above. 11. Hardness is a measure of scale forming ..... dissolved in water A) Minerals. B) Pollutants. C) Gases. D) None of the above. Show Answer Correct Answer: A) Minerals. 12. Water is hard when it contains: A) Acid solution. B) Precipitate in suspension. C) Dissolved sodium salts. D) Dissolved Ca and Mg salts. Show Answer Correct Answer: D) Dissolved Ca and Mg salts. 13. Scale formation in boilers causes A) No loss of heat. B) Wastage of heat. C) Increase in efficiency. D) None of the above. Show Answer Correct Answer: B) Wastage of heat. 14. Ion-free water coming out from the exchanger is known as ..... A) Demineralised water. B) Potable water. C) Disinfected water. D) Coagulated water. Show Answer Correct Answer: A) Demineralised water. 15. The role of silver sulphate in COD is A) Reducing agent. B) Oxidising agent. C) Catalyst. D) None of above. Show Answer Correct Answer: C) Catalyst. 16. Water treatment process (seawater desalination) is opposite to natural osmosis is A) Reverse Osmosis. B) Ultrafiltration. C) Nanofiltration. D) Microfiltration. Show Answer Correct Answer: A) Reverse Osmosis. 17. What is the membrane that selectively allows certain species to pass through called? A) Permeable membrane. B) Semi-permeable membrane. C) Impermeable membrane. D) Membrane. Show Answer Correct Answer: B) Semi-permeable membrane. 18. When the impure water is passed through anion exchange resin the anion of the impure water gets exchanged with A) H+ of anion. B) OH- of Cation. C) OH- of anion. D) H+ of cation. Show Answer Correct Answer: C) OH- of anion. 19. Which of the following does not cause the permanent hardness in water? A) Nitrates. B) Sulphates. C) Chlorides. D) Bicarbonates. Show Answer Correct Answer: D) Bicarbonates. 20. Problems associated with scale and sludge formation A) Loss of fuel. B) Boiler explosion. C) Less boiler efficiency. D) All of these. Show Answer Correct Answer: D) All of these. ← PreviousNext →Related QuizzesWater Technology Quiz 1Water Technology Quiz 3 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books