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
The major principal stress in an element of cohesion-less soil within the backfill of a retaining wall is

None of these
Vertical if the soil is in an active state of plastic equilibrium
Inclined at 45° to the vertical plane
Vertical if the soil is in a passive state of plastic equilibrium

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

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

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