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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Soil Mechanics and Foundation
Effective stress on soil

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

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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

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

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