Soil Mechanics and Foundation
Coefficient of compressibility is

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
independent of type of soil but depends on the stress history of soil

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Soil Mechanics and Foundation
In a triaxial compression test when drainage is allowed during the first stage (i. e. application of cell pressure) only and not during the second stage (i.e. application of deviator stress at constant cell pressure), the test is known as

unconsolidated undrained test
unconsolidated drained test
consolidated drained test
consolidated undrained test

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Soil Mechanics and Foundation
In hydrometer analysis for a soil mass

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

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