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

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

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Soil Mechanics and Foundation
The admixture of coarser particles like sand or silt to clay causes

decrease in liquid limit and increase in plasticity index
increase in both liquid limit and plasticity index
decrease in liquid limit and no change in plasticity index
decrease in both liquid limit and plasticity index

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Soil Mechanics and Foundation
The shear strength of a soil

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

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