Soil Mechanics and Foundation
A tri-axial shear test is preferred to direct shear test, because

None of these
Precise measurement of pore pressure and change in volume during test, is not possible
It can be performed under all three drainage conditions with complete control
Stress distribution on the failure plane, is non uniform

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Soil Mechanics and Foundation
In hydrometer analysis for a soil mass

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

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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 drained test
unconsolidated undrained test
consolidated drained test
consolidated undrained test

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Soil Mechanics and Foundation
The ultimate consolidation settlement of a structure resting on a soil

Decreases with the increase in the initial voids ratio
Increases with the decrease in the porosity of the soil
Decreases with the decrease in the plastic limit
Increases with the increase in the initial voids ratio

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