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

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
None of these

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

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

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Soil Mechanics and Foundation
Coefficient of earth pressure at rest is

greater than active earth pressure but less than passive earth pressure
greater than both the active earth pressure and passive earth pressure
less than active earth pressure but greater than passive earth pressure
less than both the active and passive earth pressures

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