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.
None of these
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
The major principal stress in an element of cohesion-less soil within the backfill of a retaining wall is

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
Inclined at 45° to the vertical plane

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