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

24 months
6 months
12 months
3 months

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Soil Mechanics and Foundation
For a loose sand sample and a dense sand sample consolidated to the same effective stress

ultimate strength is same but peak strength of dense sand is greater than that of loose sand
ultimate strength is same and also peak strength is same
ultimate strength is same but peak
ultimate strength is different but peak strength is same

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

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

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