1. MULTIPLE CHOICE QUESTIONS
CHAPTER NO. 01 WATER
MULTIPLE CHOICE QUESTIONS

2. Hardness in water is caused by the presence of:
a) sodium chloride
b) sodium carbonate
c) calcium chloride
d) potassium nitrate .

3. Permanent hardness in water is caused by the presence of:
a) calcium chloride
b) magnesium sulphate
c) both of them
d) none of them

4. Temporary hardness in water can be removed by:
a) adding soda
b) distillation
c) boiling
d) adding lime-soda

5. Permanent hardness of water cannot be removed by:
a) adding soda
b) distillation
c) boiling
d) adding lime-soda

6. The exhausted permutit (zeolite) is regenerated by percolating through it a solution of:
a) calcium chloride
b) zinc chloride
c) magnesium chloride
d) sodium chloride

7. Hard water may be softened by passing it through:
a) limestone
b) ion-exchange resin
c) calgon
d) rock salt

8. pH of acidic solution is:
b) 7
c) less than 7
d) more than 7

9. Water containing magnesium bicarbonate and calcium chloride is:
a) soft only
b) temporary hard only
c) permanent hard only
d) both temporary and permanent hard

10. EDTA method of determining hardness of water can be used to determine :
a) all types of hardness
b) temporary hardness only
c) permanent hardness only
d) alkaline hardness only

11. Water is hard when it contains:
a) acid solution
b) precipitate in suspension
c) dissolved sodium salts
d) dissolved Ca and Mg salts

12. Brackish water mostly contains dissolved:
a) Ca salts
b) Mg salts
c) NaCl
d) suspended impurities

13. Brackish water can be purified using:
a) lime-soda method
b) permuit process
c) reverse osmosis method
d) none of these

14. Coagulants help in the settling of:
a) suspended impurities only
b) fine suspended matter only
c) colloidal particles only
d) both (b) and (c)

15. Most popular and ideal disinfectant in water works is:
a) soda
b) ozone
c) chlorine
d) lime

16. Alkalinity in water cannot be due to the presence of:
a) OH- only
b) OH- and CO3--
c) OH- and HCO3-
d) CO3 -- and HCO3-

17. pH of neutral water is:
a) 0
b) 7
c) 14
d) 10-7

18. During reverse osmosis:
a) dissolved salts are pushed out through semipermeable membrane
b) only dissolved ionic salts are pushed out through the semipermeable membrane
c) pure water is pushed out through semipermeable membrane
d) both water and dissolved salts are pushed out through the semipermeable membrane

19. Sea water usually contains about :
a) 1% dissolved salts
b) 4% dissolved salts, of which NaCl is about 3.6%
c) 10% of dissolved salts
d) 1000 ppm of dissolved salts

20. Water containing dissolved salts with a peculiar salty taste is called:
a) soft water
b) brackish water
c) hard water
d) desalinated water

21. The process of removing extra common salt from water is called:
a) deionization
b) softening
c) disinfections
d) desalination

22. Osmosis is a process in which :
a) solute molecules moves from a solution of higher concentration to lower concentration through a semi-permeable membrane
b) solute molecules move from a solution of lower concentration to higher one through semipermeable membrane
c) solvent molecules moves from solution of lower concentration to higher one through semipermeable membrane
d) solvent molecules moves from solution of higher concentration to lower one through semipermeable membrane

23. A semipermeable membrane allows the flow of:
a) solvent molecules
b) solute molecules
c) both solute and solvent molecules
d) neither solute nor solvent molecules

24. Hard water is water containing:
a) Ca2+, Mg2+ or Fe2+
b) NO3- and PO43-
c) Na+, k+
d) dissolved gases

25. A sample of water contains sodium chloride. It is :
a) hard water
b) soft water
c) moderately hard
d) none

26. Chlorine is used in purification of drinking water for:
a) disinfection
b) coagulation
c) desalination
d) none of these

27. Purest form of natural water is :
a) river water
b) sea water
c) rain water
d) lake water

28. Scale formation in boiler causes :
a) no loss of heat
b) wastage of heat
c) increase in efficiency
d) none of the above

29. Blow down operation causes the removal of :
a) scales
b) sludges
c) both of these
d) hot water only

30. Internal treatment of boiler feed water means:
a) treating water during evaporation itself
b) treating water before boiler-feeding it
c) treating chemically the steam formed
d) treating after some internal change in boiler designs.

31. Hard water is unfit for use in boilers for “steam raising” because:
a) its boiling point is higher
b) steam is generated at a high pressure
c) it leads to scale formation inside boiler
d) water undergoes decomposition into oxygen and hydrogen.

32. Water matching distilled water is obtained by using :
a) Zeolite process
b) Ion exchange process
c) lime soda process
d) boiling

33. Hard water may be softened by passing it through :
a) sodium silicate
b) limestone
c) Ion exchange resin
d) sodium hexa meta phosphate (Calgon)

34. Pure water can be obtained by using:
a) permutit (Zeolite) process
b) demineralization method
c) lime soda process
d) none of these

35. For maximum efficiency, disinfection of water by chlorination should be carried out:
a) below break point
b) at pH above 7
c) at pH of 5 to 6.5
d) in cold

36. a) Osmosis b) Dialysis c) Electrodialysis d) Coagulation
Swimming for a long time in salt water makes the skin of ones fingertips wrinkled. Which one of the following properties is responsible for this observation?
a) Osmosis
b) Dialysis
c) Electrodialysis
d) Coagulation

37. Sterilization of water can be done by using:
a) oxygen
b) ozone
c) caustic soda
d) hydrogen peroxide

38. A chemical which can simultaneously act as coagulant and softening agent is :
a) alum
b) soda
c) sodium aluminate
d) lime

39. Internal treatment of boiler feed water involves:
a) to precipitate the scale forming substances in the form of sludge
b) to convert them into soluble substances
c) both of the above
d) none of the above

40. a) higher than osmotic pressure b) lower than osmotic pressure
The flow of water through a membrane from saline water into fresh water takes place when the applied pressure on saline water is
a) higher than osmotic pressure
b) lower than osmotic pressure
c) equal to osmotic pressure
d) zero

41. Chlorine is used in purification of drinking water for:
a) sterilization
b) coagulation
c) disinfection
d) none of these

42. Ultra violet rays are used in water treatment for:
a) illumination
b) sterilization
c) coagulation
d) sedimentation

43. Ultra violet rays are used in water treatment for:
a) illumination
b) sterilization
c) coagulation
d) sedimentation

44. a) KI b) Na2S2O3 c) Mn(OH)2 d) KOH
In the determination of dissolved oxygen by Winkler’s method , is used as oxygen carrier.
a) KI
b) Na2S2O3
c) Mn(OH)2
d) KOH

45. a) KI b) Na2S2O3 c) Mn(OH)2 d) KOH
In the determination of dissolved oxygen by Winkler’s method , is used as oxygen carrier.
a) KI
b) Na2S2O3
c) Mn(OH)2
d) KOH

46. Which one of the following is not used as disinfectant?
a) Chlorine Gas
b) Bleaching powder
c) Chloramine
d) Hydrochloric acid

47. Which one of the following is not used as disinfectant?
a) Chlorine Gas
b) Bleaching powder
c) Chloramine
d) Hydrochloric acid

48. Which method is used to determined chloride from water sample?
a) Winkler’s method
b) Mohr’s method
c) Dulong’s method
d) Boy’s method

49. Which method is used to determined chloride from water sample?
a) Winkler’s method
b) Mohr’s method
c) Dulong’s method
d) Boy’s method

50. In the determination of chlorides by Mohr’s method which indicator is used?
a) Starch
b)Phenolphthlein
c) Methyl Orange
d) Potassium Chromate

51. In the determination of chlorides by Mohr’s method which indicator is used?
a) Starch
b)Phenolphthlein
c) Methyl Orange
d) Potassium Chromate