Soil Mechanics and Foundation
In a deposit of normally consolidated clay

effective stress and undrained strength increase with depth but water content decreases with depth
effective stress and water content increase with depth but undrained strength decreases with depth
effective stress increases with depth but water content of soil and un-drained strength decrease with depth
effective stress, water content and undrained strength decrease with depth

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

None of these
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
For a well graded soil, both uniformity coefficient and coefficient of curvature are nearly unity.

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

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

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Soil Mechanics and Foundation
A cylindrical specimen of saturated soil failed under an axial vertical stress of 100kN/m2 when it was laterally unconfmed. The failure plane was inclined to the horizontal plane at an angle of 45°. The values of cohesion and angle of internal friction for the soil are respectively

0.2 N/mm² and 0°
0.05 N/mm² and 0°
0.05 N/mm² and 45°
0.5 N/mm² and 30°

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Soil Mechanics and Foundation
The admixture of coarser particles like sand or silt to clay causes

increase in both liquid limit and plasticity index
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

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