Soil Mechanics and Foundation
The admixture of coarser particles like sand or silt to clay causes

decrease in liquid limit and increase in plasticity index
increase in both liquid limit and plasticity index
decrease in both liquid limit and plasticity index
decrease in liquid limit and no change in plasticity index

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Soil Mechanics and Foundation
Coefficient of compressibility is

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

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Soil Mechanics and Foundation
Coefficient of earth pressure at rest is

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

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Soil Mechanics and Foundation
Effective stress on soil

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

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