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

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

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

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Soil Mechanics and Foundation
In a triaxial compression test when drainage is allowed during the first stage (i. e. application of cell pressure) only and not during the second stage (i.e. application of deviator stress at constant cell pressure), the test is known as

unconsolidated undrained test
consolidated undrained test
consolidated drained test
unconsolidated drained test

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

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