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

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

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Soil Mechanics and Foundation
The average coefficient of permeability of natural deposits

Parallel to stratification is always greater than that perpendicular to stratification
Parallel to stratification is always less than that perpendicular to stratification
Parallel to stratification may or may not be greater than that perpendicular to stratification
Is always same in both directions

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Soil Mechanics and Foundation
A cylindrical specimen of saturated soil failed under an axial vertical stress of 100kN/m2 when it was laterally unconfmed. The failure plane was inclined to the horizontal plane at an angle of 45°. The values of cohesion and angle of internal friction for the soil are respectively

0.2 N/mm² and 0°
0.05 N/mm² and 45°
0.5 N/mm² and 30°
0.05 N/mm² and 0°

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

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

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