Soil Mechanics and Foundation
Highway Research Board (HRB) classification of soils is based on

particle size composition
plasticity characteristics
both particle size composition and plasticity characteristics
None of these

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Soil Mechanics and Foundation
Effective stress on soil

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

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