The amount of soil lost to sea each year due to rainfall is around:

Related Mcqs:

1. Removal of top soil by soil erosion result in the loss of soil:

   A. Nitrites
   B. Nitrates
   C. Nitrogen
   D. Nitric and nitrous acids

2. Tarbela dam is being silted at ______ acre feet per year while Mangla is being silted at a rate of _____ acre feet per year due to misuse of their watershed area:

   A. 109000, 42,000
   B. 110000, 43000
   C. 115000, 44,000
   D. None of these

3. A slopy land on account of continued rainfall initially under goes:

   A. Rill erosion
   B. Gully erosion
   C. Sheet erosion
   D. All of these

4. In water logged soil plants cannot grow properly because the soil is:

   A. Physiologically wet
   B. Physiologically dry
   C. Physically dry
   D. None of the above

5. When a plant first begins to wilts permanently in a pot, its 54.5 gms of soil has 4.5 gms of water. The PWP of this soil is:

   A. 4.50%
   B. 9%
   C. 8.25%
   D. 16.50%

6. The ration of volume of pores in the soil to the total soil volume is referred to as:

   A. Pore frequency ratio
   B. Pore density ration
   C. Pore abundance ratio
   D. Pore space ratio

7. When a soil has been thoroughly wetted and then allowed to drain until capillary movement of the water has stopped, the water content of the soil will give an estimate of it’s:

   A. Gravitational water
   B. Capillary water
   C. Field capacity
   D. Storage capacity

8. The sea water gets pollution mainly due to:

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

9. The soil permeability can be decreased due to blockers called:

   A. Pans
   B. Peds
   C. Clods
   D. None of these

10. Over-all mineral level of soil recedes due to:

    A. Leaching only
    B. Utilization by plants
    C. Both (a) & (b)
    D. Chemical reactions