Soil Mechanics and Foundation
In the triaxial compression test, the application of additional axial stress (i.e. deviator stress) on the soil specimen produces shear stress on

vertical plane only
both horizontal and vertical planes
horizontal plane only
all planes except horizontal and vertical planes

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

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

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