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

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Soil Mechanics and Foundation
In a deposit of normally consolidated clay

effective stress increases with depth but water content of soil and un-drained strength decrease with depth
effective stress and water content increase with depth but undrained strength decreases with depth
effective stress, water content and undrained strength decrease with depth
effective stress and undrained strength increase with depth but water content decreases with depth

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