Soil Mechanics and Foundation
Coefficient of compressibility is

different for different types of soils and also different for a soil under different states of consolidation
constant for any type of soil
different for different types of soils but same for a soil under different states of consolidation
independent of type of soil but depends on the stress history of soil

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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]
optimum water content increases but maximum dry density decreases
both optimum water content and maximum dry density increase
optimum water content decreases but maximum dry density increases

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Soil Mechanics and Foundation
A cylindrical specimen of saturated soil failed under an axial vertical stress of 100kN/m2 when it was laterally unconfmed. The failure plane was inclined to the horizontal plane at an angle of 45°. The values of cohesion and angle of internal friction for the soil are respectively

0.5 N/mm² and 30°
0.2 N/mm² and 0°
0.05 N/mm² and 45°
0.05 N/mm² and 0°

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