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

6 months
12 months
24 months
3 months

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

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

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Soil Mechanics and Foundation
The ultimate consolidation settlement of a structure resting on a soil

Increases with the decrease in the porosity of the soil
Increases with the increase in the initial voids ratio
Decreases with the increase in the initial voids ratio
Decreases with the decrease in the plastic limit

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