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
3 months
24 months
6 months

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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 always decreases
The liquid limit of soil may decrease

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

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

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