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
Inclined at 45° to the vertical plane
Vertical if the soil is in a passive state of plastic equilibrium
Vertical if the soil is in an active state of plastic equilibrium

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Soil Mechanics and Foundation
Quick sand is a

flow condition occurring in both cohesive and cohesionless soils
flow condition occurring in cohesionless soils
flow condition occurring in cohesive soils
type of sand

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