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

plasticity characteristics
both particle size composition and plasticity characteristics
particle size composition
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

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

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