Soil Mechanics and Foundation
Due to a rise in temperature, the viscosity and the unit weight of the percolating fluid are reduced to 60% and 90% respectively. If other things remain constant, the coefficient of permeability

increases by 50%
increases by 33.3%
decreases by 33.3%
increases by 25%

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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
None of these
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
The admixture of coarser particles like sand or silt to clay causes

decrease in liquid limit and increase in plasticity index
decrease in liquid limit and no change in plasticity index
decrease in both liquid limit and plasticity index
increase in both liquid limit and plasticity index

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Soil Mechanics and Foundation
Effective stress on soil

Decreases voids ratio and increases permeability
Increases both voids ratio and permeability
Increases voids ratio and decreases permeability
Decreases both voids ratio and permeability

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