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

increase in both liquid limit and plasticity index
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

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Soil Mechanics and Foundation
Quick sand is a

type of sand
flow condition occurring in cohesive soils
flow condition occurring in both cohesive and cohesionless soils
flow condition occurring in cohesionless soils

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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
unconsolidated drained test
consolidated undrained test

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