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

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

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

both optimum water content and maximum dry density decrease[ES 93]
both optimum water content and maximum dry density increase
optimum water content decreases but maximum dry density increases
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
Inclined at 45° to the vertical plane
None of these
Vertical if the soil is in a passive state of plastic equilibrium

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