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

Increase in pore water pressure but decrease in total stress
Decrease in pore water pressure but increase in total stress
Equal decrease in pore water pressure and total stress
Equal increase in pore water pressure and 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
A tri-axial shear test is preferred to direct shear test, because

None of these
It can be performed under all three drainage conditions with complete control
Precise measurement of pore pressure and change in volume during test, is not possible
Stress distribution on the failure plane, is non uniform

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