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

None of these
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

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Soil Mechanics and Foundation
Coefficient of compressibility is

different for different types of soils and also different for a soil under different states of consolidation
different for different types of soils but same for a soil under different states of consolidation
independent of type of soil but depends on the stress history of soil
constant for any type of soil

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Soil Mechanics and Foundation
Sensitivity of a soil can be defined as

percentage of volume change of soil under saturated condition
None of these
ratio of volume of voids to volume of solids
ratio of compressive strength of unconfined undisturbed soil to that of soil in a remoulded state

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