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

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

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Soil Mechanics and Foundation
The shear strength of a soil

Decreases with decrease in normal stress
Decreases with increase in normal stress
Is directly proportional to the angle of internal friction of the soil
Is inversely proportional to the angle of internal friction of the soil

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