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
Sensitivity of a soil can be defined as

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

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