Soil Mechanics and Foundation
When the degree of saturation is zero, the soil mass under consideration represents

one phase system
three phase system
two phase system with soil and water
two phase system with soil and air

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

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