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 25%
decreases by 33.3%
increases by 33.3%

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

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
It can be performed under all three drainage conditions with complete control

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Soil Mechanics and Foundation
Which of the following statements is correct?

For a well graded soil, both uniformity coefficient and coefficient of curvature are nearly unity.
Uniformity coefficient represents the shape of the particle size distribution curve.
A soil is said to be well graded if it has most of the particles of about the same size
None of these

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Soil Mechanics and Foundation
Effective stress on soil

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

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Soil Mechanics and Foundation
The major principal stress in an element of cohesion-less soil within the backfill of a retaining wall is

Inclined at 45° to the vertical plane
Vertical if the soil is in an active state of plastic equilibrium
None of these
Vertical if the soil is in a passive state of plastic equilibrium

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