Soil Mechanics and Foundation
The maximum dry density upto which any soil can be compacted depends upon

both moisture content and amount of compaction energy
moisture content only
None of these
amount of compaction energy only

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

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

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