MULTIPLE CHOICE QUESTIONS CHAPTER NO. 01 WATER MULTIPLE CHOICE QUESTIONS

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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-

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

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

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

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

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

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

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

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

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

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

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

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

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

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.

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.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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