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

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

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Soil Mechanics and Foundation
With the increase in the amount of compaction energy

optimum water content decreases but maximum dry density increases
both optimum water content and maximum dry density increase
optimum water content increases but maximum dry density decreases
both optimum water content and maximum dry density decrease[ES 93]

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

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

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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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