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
If the material of the base of the Casagrande liquid limit device on which the cup containing soil paste drops is softer than the standard hard rubber, then

The liquid limit of soil may decrease
The liquid limit of soil always decreases
The liquid limit of soil always increases
The liquid limit of soil may increase

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