Which is the best and the most effective method for the removal of organic contaminant present in the polluted water in very small quantity (say < 200 mg/litre) ?

Related Mcqs:

1. 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

2. Which is the most practical and economical method for removal of suspended solid matter from polluted water ?

   A. Sedimentation
   B. Skimming off
   C. Chlorination
   D. Biological oxidation

3. Biological oxidation ponds remove organic matters present in the polluted water by _______________?

   A. Using the activities of bacteria and other micro organisms
   B. Aerobic oxidation
   C. Both A. & B.
   D. Neither A. nor B.

4. Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted water stream ?

   A. Sedimentation tank
   B. Circular clarifier
   C. Mechanical flocculation
   D. Chemical coagulation

5. Radioactive substances present in the polluted water stream can be removed by_________________?

   A. Biological oxygen treatment
   B. Coagulation and filtration
   C. Adsorption in ion exchange materials
   D. None of these

6. Iron & manganese present in the polluted water is removed by __________________?

   A. Simple filtration
   B. Oxidation followed by settling & filtration
   C. Chemical coagulation
   D. Chlorination only

7. Which is the most efficient dust removal equipment for removal of submicronic dust particles from blast furnace gas ?

   A. Packed scrubber
   B. Gravity settling chamber
   C. Electrostatic precipitator
   D. Hydrocyclone

8. Most efficient and suitable dust removal equipment for removal of fly-ash from flue gas in a thermal power plant is the__________________?

   A. Gravity settling chamber
   B. Cyclone separator
   C. Electrostatic precipitator
   D. Bag filter

9. Maximum permissible concentration (i.e. TLV) of DDT in public water supply system is _______________ micro gram (μ g)/litre?

   A. 22
   B. 42
   C. 332
   D. 1050

10. Maximum permissible residual chlorine in treated water should be ____________ mg/litre?

    A. 0.001 to 0.01
    B. 0.2 to 0.3
    C. 2 to 3
    D. 5 to 10