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

None of these
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
Stress distribution on the failure plane, is non uniform

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Soil Mechanics and Foundation
Quick sand is a

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

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Soil Mechanics and Foundation
Rise of water table above the ground surface causes

Decrease in pore water pressure but increase in total stress
Equal decrease in pore water pressure and total stress
Increase in pore water pressure but decrease in total stress
Equal increase in pore water pressure and total stress

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