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

plasticity characteristics
both particle size composition and plasticity characteristics
None of these
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
Stress distribution on the failure plane, is non uniform
None of these
Precise measurement of pore pressure and change in volume during test, is not possible

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Soil Mechanics and Foundation
The shear strength of a soil

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

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