Soil Mechanics and Foundation
Highway Research Board (HRB) classification of soils is based on

None of these
plasticity characteristics
particle size composition
both particle size composition and plasticity characteristics

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

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

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