Soil Mechanics and Foundation
In the triaxial compression test, the application of additional axial stress (i.e. deviator stress) on the soil specimen produces shear stress on

vertical plane only
all planes except horizontal and vertical planes
both horizontal and vertical planes
horizontal plane only

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

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Soil Mechanics and Foundation
For a loose sand sample and a dense sand sample consolidated to the same effective stress

ultimate strength is same but peak strength of dense sand is greater than that of loose sand
ultimate strength is same and also peak strength is same
ultimate strength is same but peak
ultimate strength is different but peak strength is same

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