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

decrease 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
increase in both liquid limit and plasticity index

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Soil Mechanics and Foundation
If the water table rises upto ground surface, then the

total stress is increased due to decrease in pore water pressure but effective stress does not change
effective stress is reduced due to increase in pore water pressure only but total stress does not change
effective stress is reduced due to decrease in total stress only but pore water pressure does not change
total stress is reduced due to increase in pore water pressure only but effective stress does not change

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