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
Effective stress on soil

Increases voids ratio and decreases permeability
Increases both voids ratio and permeability
Decreases voids ratio and increases permeability
Decreases both voids ratio and permeability

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