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

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

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

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

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