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

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

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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 drained test
consolidated undrained test
unconsolidated drained test

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