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 ultimate consolidation settlement of a structure resting on a soil

Decreases with the decrease in the plastic limit
Decreases with the increase in the initial voids ratio
Increases with the increase in the initial voids ratio
Increases with the decrease in the porosity of the soil

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