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

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

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Soil Mechanics and Foundation
A tri-axial shear test is preferred to direct shear test, because

It can be performed under all three drainage conditions with complete control
Precise measurement of pore pressure and change in volume during test, is not possible
None of these
Stress distribution on the failure plane, is non uniform

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