Soil Mechanics and Foundation
The hydrometer method of sedimentation analysis differs from the pipette analysis mainly in

All of these
the method of taking observations
the method of preparation of soil suspension
the principle of test

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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
Vertical if the soil is in a passive state of plastic equilibrium
None of these
Vertical if the soil is in an active state of plastic equilibrium

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