Soil Mechanics and Foundation Engineering - Civil Engineering Questions and Answers

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According to Coulomb's wedge theory, the active earth pressure slides the wedge

down and outwards on a slip surface

up and inwards on a slip surface

horizontal upward and parallel to base

horizontal inward and parallel to base.

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The coefficient of curvature is defined

\(\frac { D60 } { D10 }\)

\(\frac { D 10 } { D60}\)

\(\frac { D30^2} { D60 D10}\)

\(\frac { D10^2} { D30 D60}\)

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The effective size of particles of soil is denoted by

D₁₀

D₂₀

D₃₀

D₆₀

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Degree of saturation of a natural soil deposit having water content 15%, specific gravity 2.50 and void ratio 0.5, is

50%

60%

75%

80%

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The coefficient of compressibility of soil, is the ratio of

stress to strain

strain to stress

stress to settlement

rate of loading to that of settlement.

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If the failure of a finite slope occurs through the toe, it is known as

slope failure

face failure

toe failure.

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Rankine's theory of active earth pressure assumes

soil mass is homogeneous, dry and cohesionless

ground surface is a plane which may be horizontal or inclined

back of the wall is vertical and smooth

wall yields about the base

all the above.

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The water content of soil is defined as the ratio of

volume of water to volume of given soil

volume of water to volume of voids in soil

weight of water to weight of air in voids

weight of water to weight of solids of given mass of soil.

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Accurate determination of water content, is made by

calcium carbide method

sand bath method

alcohol method

oven-drying method.