Q1.The water which does not produce lather with soap is.a) Soft water. b) Hard waterc) Distilled water. d) all of theseQ2. Temporary hardness of water can be removed by —---- processa) Lime. b)Soda. c c) lime and soda d) boilingQ3. Salt that causes temporary hardness in water is—a ) sodium chloride. b) calcium bicarbonate c) sodium sulphate d) all of theseQ4. Permanent hardness is caused due to —--salta )sodium chloride. b) sodium bicarbonate. c) calcium sulphate d) all of theseQ5. The purest form of naturally occurring water is —--a) ponds b) river. c) well. d) rainQ6. Permanent hardness is also called asa) Carbonate hardness. b) non carbonate. c) sludge d) all of these.Q7. Highly alkaline water causes —--a ) Scales. b ) sludge. c)Scum. d). Caustic embrittlementQ8. Coagulant used to remove colloidal impurities isa)Ozone. b) UV rays. c) alum. d )all of these)Q9. Coagulation process removes —a ) germs. b). Suspensed particles. c) colloidal particles d) none of theseQ10. A soft slimy deposits formed inside the boiler is called asa )Scales. b ) sludge. c)Scum. d). Caustic embrittlementQ 11. In ion exchange process, exhausted anionexchanger resin is regenerated by using ______________a) lime b)alkali c) acid d) sandQ12. Chlorine and ammonia are mixed in a ratio 2:1 to produce __________.a) Zeolite b) chloramine c) coagulant d) scaleQ13. Sedimentation is a physical process used to remove ______________.a) colloidal particles b) micro organisms particle c) suspended particles d) dissolved particlesQ14. . In ion exchange process, exhausted cation exchanger resin is regenerated by using______________a) lime b)alkali c) acid d) sandQ15. Temporary hardness of water is caused by _____________.a) CaCl2 b) Ca(HCO3)2 c) CaSO4 d) MgSO4.Q16. The exhausted zeolite is regenerated by using ______________a) lime b)alkali c) acid d)10% brine