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 increases but maximum dry density decreases
optimum water content decreases but maximum dry density increases

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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
None of these
Inclined at 45° to the vertical plane

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Soil Mechanics and Foundation
For a loose sand sample and a dense sand sample consolidated to the same effective stress

ultimate strength is same but peak strength of dense sand is greater than that of loose sand
ultimate strength is different but peak strength is same
ultimate strength is same but peak
ultimate strength is same and also peak strength is same

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