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
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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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 both the active earth pressure intensity and passive earth pressure intensity
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

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Soil Mechanics and Foundation
The total discharge from two wells situated near to each other is

sum of the discharges from individual wells
less than the sum of the discharges from individual wells
equal to larger of the two discharges from individual wells
greater than the sum of the discharges from individual wells

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