Soil Mechanics and Foundation
The rise of water table below the foundation influences the bearing capacity of soil mainly by reducing

effective angle of shearing resistance
cohesion and effective angle of shearing resistance
effective unit weight of soil and effective angle of shearing resistance
cohesion and effective unit weight of soil

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Soil Mechanics and Foundation
If the material of the base of the Casagrande liquid limit device on which the cup containing soil paste drops is softer than the standard hard rubber, then

The liquid limit of soil may decrease
The liquid limit of soil always increases
The liquid limit of soil always decreases
The liquid limit of soil may increase

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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
None of these
Stress distribution on the failure plane, is non uniform
Precise measurement of pore pressure and change in volume during test, is not possible

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