The pollutants like phenol, Na and Hg can be removed from water by technique/s such as:

Related Mcqs:

1. What are the chief pollutants of the atmosphere which are most likely to deplete the ozone layer?

   A. Sulphur di-oxide
   B. Carbon di-oxide
   C. Nitrogen oxides and fluoro-carbons
   D. Carbon monoxide

2. Some reliable indicators of air pollutants (SO2 and noxious gases) are:

   A. Ferns and Cycas
   B. Green algae and aquatic liverworts
   C. Lichens and mosses
   D. Neem’ tree and Eichhornia

3. What is Pollutants:

   A. Agents that pollute; these may be gaseous (vapours) or particulate (solid and liquid particles)
   B. On the basis of the amount and their relative harmfulness or toxicity
   C. Both (a) & (b)
   D. None of these

4. Gullies are removed by:

   A. Pan breaking
   B. Levelling
   C. Ridge terracing
   D. All of these

5. The classes of trees are removed in selection thinning:

   A. They are restricting the development of their neighbours on all sides
   B. They are less valuable than their neighbours
   C. They are of no special importance with regard to desirable species mixture
   D. All of the above

6. The major types of vegetation removed is:

   A. There is no need to eliminate any plant that is not going to suppress, endanger
   B. Or hamper the growth of a distinctly desirable member of the new stand
   C. Both (a) & (b)
   D. None of these

7. BOD value of sewage water than that of tap water is:

   A. More
   B. Less
   C. Equal
   D. Somewhere more somewhere less

8. As compared to tap water the BOD of sewage polluted water shall be:

   A. High
   B. Low
   C. Same
   D. None of these

9. When a big fish eats a small fish, which easts water-fleas supported by phytoplankton, the water leas are:

   A. Primary consumers
   B. Producers
   C. Secondary consumers
   D. Top consumers in this food chain

10. The importance of watershed management was realized when Pakistan signed Indus Water Treaty with India through which right of water of ______ was given to India while Pakistan has the right on river Indus and Jhelum:

    A. Chenab
    B. Ravi
    C. Sutlij
    D. All of the above