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

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

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

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

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

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