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

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

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

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Soil Mechanics and Foundation
Coefficient of earth pressure at rest is

greater than both the active earth pressure and passive earth pressure
greater than active earth pressure but less than passive earth pressure
less than both the active and passive earth pressures
less than active earth pressure but greater than passive earth pressure

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