Soil Mechanics and Foundation
The average coefficient of permeability of natural deposits

Is always same in both directions
Parallel to stratification may or may not be greater than that perpendicular to stratification
Parallel to stratification is always less than that perpendicular to stratification
Parallel to stratification is always greater than that perpendicular to stratification

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

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