__________ particles range in diameter between 0.02 to 0.002 mm:

Related Mcqs:

1. The clay fraction of the soil contains particles less than 0.002 mm. Particles <0.001 mm size:

   A. Soil Silt
   B. Soil colloids
   C. Soil loam
   D. Soil sand

   Submitted by: Shafiq Rehman

2. Soil particles having diameter greater than 2 mm are called___________________?

   A. Clay
   B. Silt
   C. Sand
   D. Gravel

3. Attraction between similar particles is called____________________?

   A. Adhesion
   B. Cohesion
   C. Vander wall
   D. All the above

4. The aggregation of individual particles is called___________________?

   A. Granulation
   B. Texture
   C. Flocculation
   D. Structure

5. Soil particles as individuals such as sand and do not form aggregates. These are usually found in parent material or C horizon is:_________?

   A. Massive
   B. Single-grained
   C. Aggregated
   D. All of the above

   Submitted by: Shafiq Rehman

6. ______________ consist of particles that are produced by disintegration of pre-existing rocks through the process of weathering:

   A. Clastics
   B. Non-clastics
   C. both A & B
   D. None of the above

   Submitted by: Shafiq Rehman

7. Clay and humus particles are referred to as colloids and are less than 0.002mm. Due to their small size, colloids have ________________ surface area which provides surface for adsorption, catalysis, precipitation and microbial colonization:

   A. Extremely low
   B. Extremely high
   C. Very little
   D. None of these

   Submitted by: Shafiq Rehman

8. Inorganic constituents vary in size from fine clay particles _________ mm to large _________ mm gravel and rock:

   A. < 0.002 mm- >2 mm
   B. 0.5 mm – 1.0 mm
   C. 0.02 mm- 0.2 mm
   D. None of the above

   Submitted by: Shafiq Rehman

9. Silt stones consists of grains whose size range from____________________?

   A. 0.625 mm
   B. 0.004 mm
   C. 0.0625 mm
   D. Both b & c

10. According to a latest research, Pakistan is predominantly a dryland country; 80% of its land area is arid and semi arid, 12% sub-humid and 8% under humid climate. Thus , soils of arid & semi-arid regions are vulnerable to a wide range of degradation process. As the case in arid and semi-arid climates elsewhere in south-central/southern Asia and Sub-Saharan Africa; _________________ are among the major causes of soil degradation and desertification?

    A. Drought stress
    B. Accelerated erosion & salinization
    C. Depletion of soil fertility and SOM
    D. All of the above

    Submitted by: Shafiq Rehman