Soil Mechanics and Foundation
Coefficient of compressibility is

different for different types of soils but same for a soil under different states of consolidation
independent of type of soil but depends on the stress history of soil
different for different types of soils and also different for a soil under different states of consolidation
constant for any type of soil

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Soil Mechanics and Foundation
Sensitivity of a soil can be defined as

percentage of volume change of soil under saturated condition
ratio of volume of voids to volume of solids
ratio of compressive strength of unconfined undisturbed soil to that of soil in a remoulded state
None of these

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Soil Mechanics and Foundation
Effective stress on soil

Decreases both voids ratio and permeability
Decreases voids ratio and increases permeability
Increases voids ratio and decreases permeability
Increases both voids ratio and permeability

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