Biological treatment of water pollution is done with the help of:

Related Mcqs:

1. The air pollution caused by phosphate fertilizer factories is due to:The air pollution caused by phosphate fertilizer factories is due to:

   A. Phosphene
   B. SiF4
   C. Dust
   D. Halogens

2. Escherichia coli is used as an indicator organism to determine pollution of water with:

   A. Heavy metals
   B. Faecal matter
   C. Industrial effluents
   D. Pollen of aquatic plants

3. Water pollution:

   A. Increases oxygenation
   B. Decreases turbidity
   C. Increases turbidity deoxygenation
   D. Increases photosynthesis

4. Most harmful heavy metals causing water pollution:

   A. Pb, Hg, Cr, Cd
   B. P,Mn,B,Mg
   C. N,K,Mo
   D. Zn,Mo,Mg,Ag

5. The sea water gets pollution mainly due to:

   A. Industrial waste
   B. Oil spills
   C. Death of marine fauna
   D. None of these

6. With the increase in water pollution, the BOD:

   A. Decreases
   B. Increases
   C. Remains the same
   D. Is no measure of pollution

7. The ground water pollution is due to excess of:

   A. DDT is a growth retardant
   B. Pesticides
   C. Minerals
   D. Carbon deposit

8. Thermal pollution in water bodies is caused due to discharge of:

   A. Hot water from power plants
   B. Hot chemicals from industries
   C. Waste from mines
   D. Waste from agricultural fields

9. The cause of water pollution?

   A. Smoke
   B. 2, 4-D and pesticides
   C. Automobile exhaust
   D. Aeroplanes

10. If water pollution continues at its present rate, it will eventually:

    A. Make oxygen molecules unavailable to aquatic life
    B. Make nitrates unavailable to aquatic life
    C. Prevent precipitation
    D. Stop the water cycle