Soil Mechanics and Foundation
A cylindrical specimen of saturated soil failed under an axial vertical stress of 100kN/m2 when it was laterally unconfmed. The failure plane was inclined to the horizontal plane at an angle of 45°. The values of cohesion and angle of internal friction for the soil are respectively

0.5 N/mm² and 30°
0.2 N/mm² and 0°
0.05 N/mm² and 0°
0.05 N/mm² and 45°

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Soil Mechanics and Foundation
A tri-axial shear test is preferred to direct shear test, because

Stress distribution on the failure plane, is non uniform
None of these
It can be performed under all three drainage conditions with complete control
Precise measurement of pore pressure and change in volume during test, is not possible

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