Soil Mechanics and Foundation
Highway Research Board (HRB) classification of soils is based on

both particle size composition and plasticity characteristics
particle size composition
plasticity characteristics
None of these

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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

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

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