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

None of these
Stress distribution on the failure plane, is non uniform
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

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Soil Mechanics and Foundation
The effect of cohesion on a soil is to

increase the active earth pressure in-tensity but to reduce the passive earth pressure intensity [GATE 99]
reduce the active earth pressure in-tensity but to increase the passive earth pressure intensity
increase both the active earth pressure intensity and passive earth pressure intensity
reduce both the active earth pressure intensity and passive earth pressure intensity

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