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

Equal increase in pore water pressure and total stress
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

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Soil Mechanics and Foundation
A tri-axial shear test is preferred to direct shear test, because

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

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