Soil Mechanics and Foundation
Toughness index is defined as the ratio of

liquidity index to flow index
consistency index to liquidity index
plasticity index to flow index
plasticity index to consistency index

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

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Soil Mechanics and Foundation
The shear strength of a soil

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

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