Soil Mechanics and Foundation
The admixture of coarser particles like sand or silt to clay causes

decrease in liquid limit and no change in plasticity index
decrease in both liquid limit and plasticity index
increase in both liquid limit and plasticity index
decrease in liquid limit and increase in plasticity index

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Soil Mechanics and Foundation
The major principal stress in an element of cohesion-less soil within the backfill of a retaining wall is

Inclined at 45° to the vertical plane
Vertical if the soil is in an active state of plastic equilibrium
None of these
Vertical if the soil is in a passive state of plastic equilibrium

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

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