Soil Mechanics and Foundation
Rise of water table above the ground surface causes

Decrease in pore water pressure but increase in total stress
Equal increase in pore water pressure and total stress
Equal decrease in pore water pressure and total stress
Increase in pore water pressure but decrease in total stress

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Soil Mechanics and Foundation
The major principal stress in an element of cohesion-less soil within the backfill of a retaining wall is

Vertical if the soil is in an active state of plastic equilibrium
Vertical if the soil is in a passive state of plastic equilibrium
None of these
Inclined at 45° to the vertical plane

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Soil Mechanics and Foundation
If the water table rises upto ground surface, then the

total stress is reduced due to increase in pore water pressure only but effective stress does not change
total stress is increased due to decrease in pore water pressure but effective stress does not change
effective stress is reduced due to decrease in total stress only but pore water pressure does not change
effective stress is reduced due to increase in pore water pressure only but total stress does not change

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Soil Mechanics and Foundation
Effective stress on soil

Increases voids ratio and decreases permeability
Decreases both voids ratio and permeability
Increases both voids ratio and permeability
Decreases voids ratio and increases permeability

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