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

None of these
It can be performed under all three drainage conditions with complete control
Precise measurement of pore pressure and change in volume during test, is not possible
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
meniscus correction is additive and dispersing agent correction is subtractive
meniscus correction is subtractive and dispersing agent correction is additive
both meniscus correction and dispersing agent correction are subtractive

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