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.
A soil is said to be well graded if it has most of the particles of about the same size
Uniformity coefficient represents the shape of the particle size distribution curve.
None of these

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Soil Mechanics and Foundation
For a loose sand sample and a dense sand sample consolidated to the same effective stress

ultimate strength is same and also peak strength is same
ultimate strength is same but peak
ultimate strength is different but peak strength is same
ultimate strength is same but peak strength of dense sand is greater than that of loose sand

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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
Stress distribution on the failure plane, is non uniform
It can be performed under all three drainage conditions with complete control
None of these

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