Soil Mechanics and Foundation
Clay layer A with single drainage and coefficient of consolidation Cv takes 6 months to achieve 50% consolidation. The time taken by clay layer B of the same thickness with double drainage and coefficient of consolidation Cv/2 to achieve the same degree of consolidation is

12 months
24 months
3 months
6 months

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

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