Soil Mechanics and Foundation
The shear strength of a soil

Is inversely proportional to the angle of internal friction of the soil
Is directly proportional to the angle of internal friction of the soil
Decreases with increase in normal stress
Decreases with decrease in normal stress

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

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

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