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

Equal increase in pore water pressure and total stress
Equal decrease in pore water pressure and total stress
Decrease in pore water pressure but increase in 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
Inclined at 45° to the vertical plane
None of these

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Soil Mechanics and Foundation
The admixture of coarser particles like sand or silt to clay causes

decrease in both liquid limit and plasticity index
decrease in liquid limit and no change in plasticity index
increase in both liquid limit and plasticity index
decrease in liquid limit and increase in plasticity index

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