Soil Mechanics and Foundation
With the increase in the amount of compaction energy

optimum water content decreases but maximum dry density increases
both optimum water content and maximum dry density increase
both optimum water content and maximum dry density decrease[ES 93]
optimum water content increases but maximum dry density decreases

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Soil Mechanics and Foundation
The major principal stress in an element of cohesion-less soil within the backfill of a retaining wall is

Vertical if the soil is in an active state of plastic equilibrium
Vertical if the soil is in a passive state of plastic equilibrium
Inclined at 45° to the vertical plane
None of these

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Soil Mechanics and Foundation
Sensitivity of a soil can be defined as

ratio of volume of voids to volume of solids
percentage of volume change of soil under saturated condition
ratio of compressive strength of unconfined undisturbed soil to that of soil in a remoulded state
None of these

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