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

None of these
Stress distribution on the failure plane, is non uniform
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

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Soil Mechanics and Foundation
The shear strength of a soil

Decreases with increase in normal stress
Is inversely proportional to the angle of internal friction of the soil
Decreases with decrease in normal stress
Is directly proportional to the angle of internal friction of the soil

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

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