Soil Mechanics and Foundation
Select the incorrect statement. Effective angle of shearing resistance

increases as the soil gradation im-proves
is limited to a maximum value of 45°
increases as the size of particles increases
is rarely more than 30° for fine grained soil

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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
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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