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

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

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Soil Mechanics and Foundation
With the increase in the amount of compaction energy

optimum water content decreases but maximum dry density increases
both optimum water content and maximum dry density decrease[ES 93]
optimum water content increases but maximum dry density decreases
both optimum water content and maximum dry density increase

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