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

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

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Soil Mechanics and Foundation
In hydrometer analysis for a soil mass

both meniscus correction and dispersing agent correction are additive
meniscus correction is additive and dispersing agent correction is subtractive
both meniscus correction and dispersing agent correction are subtractive
meniscus correction is subtractive and dispersing agent correction is additive

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