Soil Mechanics and Foundation
Coefficient of earth pressure at rest is

greater than active earth pressure but less than passive earth pressure
less than both the active and passive earth pressures
less than active earth pressure but greater than passive earth pressure
greater than both the active earth pressure and passive earth pressure

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Soil Mechanics and Foundation
Effective stress on soil

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

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Soil Mechanics and Foundation
Coefficient of compressibility is

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
different for different types of soils but same for a soil under different states of consolidation

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