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

both particle size composition and plasticity characteristics
particle size composition
plasticity characteristics
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 different but peak strength is same
ultimate strength is same but peak strength of dense sand is greater than that of loose sand
ultimate strength is same and also peak strength is same
ultimate strength is same but peak

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