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

Related Mcqs:

1. Presence of _____________ hardness is responsible for the temporary hardness in water?

   A. Carbonate
   B. Calcium
   C. Chloride
   D. Sulphate

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

   A. Chlorine
   B. Alkalis
   C. Benzene hexachloride
   D. Alkyl benzene sulphonate (ABS)

3. 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.

4. The amount of chemical coagulant added for treatment of polluted water ______________ with increase in temperature of the polluted water to be treated?

   A. Decreases
   B. Increases
   C. Remain constant
   D. May increase or decrease; depends on the chemical characteristics of polluted water

5. A gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from ______________ ppm?

   A. 1000 to 2000
   B. 3000 to 6000
   C. 6000 to 9000
   D. 10000 to 100000

6. Color test of water is done with an instrument called__________________?

   A. Tintometer
   B. Colorimeter
   C. Electro-chemical cell
   D. Turbidimeter

7. In water treatment plant, zeolite process is used to remove the _____________ of water?

   A. Acidity
   B. Alkalinity
   C. Hardness
   D. Iron & zinc

8. The detrimental effect on organism and water quality with temperature rise of aquatic system is the reduction of _____________ of water?

   A. Dissolved oxygen content
   B. Biological oxygen demand
   C. Vapor pressure
   D. All A., B. and C.

9. Thermal pollution of water increases its toxicity and oxidation of oxygen demanding waste besides favouring bacterial growth. A rise in water temperature by 10°C, doubles the toxic effects of _____________ present in it?

   A. Coal ash
   B. Potassium cyanide
   C. Ortho-xylene
   D. None of these

10. 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