The destruction of water-borne pathogens is termed as disinfection of water. Which of the following is a water disinfectant ?

Related Mcqs:

1. Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of_________________?

   A. Ozone and iodine
   B. Chlorine or its compounds
   C. Ultraviolet light for irradiation of water
   D. All A., B. & C.

2. Which of the following is the most widely used disinfectant in water treatment ?

   A. Chlorine
   B. Irradiation of water by ultraviolet light
   C. Cation exchanger
   D. Coagulation

3. Irradiation of water by ultraviolet light of suitable wavelength is commonly used for disinfection of water in___________________?

   A. Food industry
   B. Municipal sewage treatment
   C. Petroleum refinery
   D. Iron & steel plant

4. Disinfection of water is done to remove ______________________?

   A. Color
   B. Bad taste
   C. Foul odour
   D. Bacteria

5. Removal of ______________ results from the disinfection of water?

   A. Turbidity
   B. Odour
   C. Hardness
   D. Bacteria

6. The materials which fracture even at small strains are termed as brittle, while those materials which exhibit an appreciable deformation before failure are termed as__________________?

   A. Rigid
   B. Tough
   C. Ductile
   D. Plastic

7. A polymer is termed as an ‘elastomer’, if its percentage elongation is more than 100%. An elastomer is termed as ‘rubber’ if its percentage elongation is more than _______________ percent ?

   A. 150
   B. 200
   C. 300
   D. 400

8. For water at 300°C, it has a vapour pressure 8592.7 kPa and fugacity 6738.9 kPa Under these conditions, one mole of water in liquid phase has a volume of 25.28 cm3 and that in vapour phase in 391.1 cm3.Fugacity of water (in kPa) at 9000 kPa will be__________________?

   A. 6738.9
   B. 6753.5
   C. 7058.3
   D. 9000

9. Saturated solution of benzene in water is in equilibrium with a mixture of air and vapours of benzene and water at room temperature and pressure. Mole fraction of benzene in liquid is xB and the vapour pressures of benzene and water at these conditions are pv B and pv w respectively. The partial pressure of benzene in air-vapour mixture is_________________?

   A. PvB
   B. xB.PvB
   C. (Patm – Pvw)xB
   D. xB.Patm

10. A standard test for determination of hardness in water is termed as ______________ test?

    A. EDTA
    B. Electometric
    C. Total count
    D. Presumptive