The supersonic jets cause pollution by thinning of:

Related Mcqs:

1. Crown thinning or high thinning is:

   A. Trees are removed from the upper crown classes in order to open up the canopy
   B. It favour the development of the most promising trees of the same classes
   C. Both (a) & (b)
   D. None of these

2. Low thinning or ordinary thinning is:

   A. Trees are removed from the lower crown classes
   B. In the highest grade of low thinnings only the suppressed trees would be removed
   C. Both (a) & (b)
   D. None of these

3. 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

4. Which of the following does not cause pollution?

   A. CO2
   B. SO2
   C. H2
   D. CO

5. The main cause of pollution in metro cities is due to:

   A. Industries
   B. Automobiles
   C. Home fuel
   D. Trees

6. The major cause of pollution is:

   A. Man
   B. Plants
   C. Animals
   D. Man and animals

7. The cause of water pollution?

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

8. The major types of thinning are:

   A. Mechanical
   B. Selection
   C. Ordinary/low
   D. Crown
   E. All of the above

9. The major types of thinning in mixed plantation are:

   A. Selection
   B. Trees to be felled
   C. Improvement felling
   D. All of the above

10. Free thinning is:

    A. The attention is concentrated still further on the selection of the stems evenly spaced over the ground
    B. Which are to be retained to maturity or till the last thinning or two
    C. Both (a) & (b)
    D. None of these