Soil Mechanics and Foundation
Hydrometer readings are corrected for:

Dispersing agent correction
Temperature correction
Temperature, meniscus and dispersing agent corrections
Meniscus correction

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Soil Mechanics and Foundation
Coefficient of compressibility is

independent of type of soil but depends on the stress history of soil
different for different types of soils but same for a soil under different states of consolidation
different for different types of soils and also different for a soil under different states of consolidation
constant for any type of soil

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

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