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

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

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Soil Mechanics and Foundation
With the increase in the amount of compaction energy

optimum water content decreases but maximum dry density increases
both optimum water content and maximum dry density increase
both optimum water content and maximum dry density decrease[ES 93]
optimum water content increases but maximum dry density decreases

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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 always increases
The liquid limit of soil may decrease

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