Rise of water table in cohesionless soils upto ground surface reduces the net ultimate bearing capacity approximately by________________?

Related Mcqs:

1. If the water table rises upto ground surface, then the___________________?

   A. effective stress is reduced due to decrease in total stress only but pore water pressure does not change
   B. effective stress is reduced due to increase in pore water pressure only but total stress does not change
   C. total stress is reduced due to increase in pore water pressure only but effec-tive stress does not change
   D. total stress is increased due to de-crease in pore water pressure but effective stress does not change

2. The rise of water table below the foundation influences the bearing capacity of soil mainly by reducing_______________?

   A. cohesion and effective angle of shearing resistance
   B. cohesion and effective unit weight of soil
   C. effective unit weight of soil and effective angle of shearing resistance
   D. effective angle of shearing resistance

3. Rise of water table above the ground surface causes________________?

   A. equal increase in pore water pressure and total stress
   B. equal decrease in pore water pressure and total stress
   C. increase in pore water pressure but decrease in total stress
   D. decrease in pore water pressure but increase in total stress

4. A 600 mm square bearing plate settles by 15 mm in plate load test on a cohesionless soil under an intensity of loading of 0.2 N/ram2. The settlement of a prototype shallow footing 1 m square under the same intensity of loading is_______________?

   A. 15 mm
   B. between 15 mm and 25 mm
   C. 25 mm
   D. greater than 25 mm

5. In the plate loading test for determining the bearing capacity of soil, the size of square bearing plate should be_________________?

   A. less than 300 mm
   B. between 300 mm and 750 mm
   C. between 750 mm and 1 m
   D. greater than 1 m

6. The major principal stress in an element of cohesionless soil within the backfill of a retaining wall is________________?

   A. vertical if the soil is in an active state of plastic equilibrium
   B. vertical if the soil is in a passive state of plastic equilibrium
   C. inclined at 45° to the vertical plane
   D. none of the above

7. For better strength and stability, the fine grained soils and coarse grained soils are compacted respectively as____________________?

   A. dry of OMC and wet of OMC
   B. wet of OMC and dry of OMC
   C. wet of OMC and wet of OMC
   D. dry of OMC and dry of OMC where OMC is optimum moisture content

8. Terzaghi’s bearing capacity factors Nc, Nq and Nr are functions of______________?

   A. cohesion only
   B. angle of internal friction only
   C. both cohesion and angle of internal friction
   D. none of the above

9. Terzaghi’s general bearing capacity formula for a strip footing (C Nc + y D Nq + 0.5 Y NTB. gives______________?

   A. safe bearing capacity
   B. net safe bearing capacity
   C. ultimate bearing capacity
   D. net ultimate bearing capacity where C = unit cohesion

   Y =unit weight of soil D = depth of foundation B = width of foundation N„ Nq, NY = bearing capacity factors

10. The maximum dry density upto which any soil can be compacted depends upon____________?

    A. moisture content only
    B. amount of compaction energy only
    C. both moisture content and amount of compaction energy
    D. none of the above