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
6 months
3 months
24 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
Parallel to stratification may or may not be greater than that perpendicular to stratification
Is always same in both directions

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Soil Mechanics and Foundation
In hydrometer analysis for a soil mass

meniscus correction is additive and dispersing agent correction is subtractive
both meniscus correction and dispersing agent correction are additive
both meniscus correction and dispersing agent correction are subtractive
meniscus correction is subtractive and dispersing agent correction is additive

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