Soil Mechanics and Foundation
Effective stress is

a physical parameter that can be measured
the stress at particles contact
All of these
important because it is a function of engineering properties of soil

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

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Soil Mechanics and Foundation
Which of the following statements is correct?

Uniformity coefficient represents the shape of the particle size distribution curve.
For a well graded soil, both uniformity coefficient and coefficient of curvature are nearly unity.
None of these
A soil is said to be well graded if it has most of the particles of about the same size

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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

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

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Soil Mechanics and Foundation
The shear strength of a soil

Is inversely proportional to the angle of internal friction of the soil
Decreases with decrease in normal stress
Is directly proportional to the angle of internal friction of the soil
Decreases with increase in normal stress

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