Soil Mechanics and Foundation
Degree of consolidation is

directly proportional to time and inversely proportional to square of drainage path
directly proportional to time and inversely proportional to drainage path
directly proportional to square of drainage path and inversely proportional to time
directly proportional to drainage path and inversely proportional to time

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

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

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

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