The minimum possible void ratio of uniformly graded spherical grains is _______ - Soil Mechanics Quiz

Civil Engineering : Soil Mechanics - Quiz(MCQ)

The minimum possible void ratio of uniformly graded spherical grains is _______

A)

0.20

B)

0.25

C)

0.30

D)

0.35

Correct Answer : 0.35

Explanation : Consider a unit cube of soil having spherical particles of diameter d.
Volume of the solids Vs= (π/6)=0.5236
The total volume V=(1-cosα)*(√(1+2cosα))
Minimum void ratio is possible in densest state with α=60°
∴ V=(1-cos60°)*(√(1+2cos60°))
V=0.7071
Volume of the voids Vv=V-Vs=0.7071-0.5236
Vv=0.1835
Voids ratio e= Vv/ Vs=0.1835/0.5236
∴ e=0.35.

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A)

ductility

B)

porosity

C)

permeability

D)

plasticity

Correct Answer : Option (D) : plasticity

During seepage through a soil, direction of seepage is always_______.

A)

perpendicular to stream lines

B)

parallel to equipotential lines

C)

perpendicular to equipotential lines

D)

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The ratio of the weight of water to the weight of solids in a given mass of soil, is known_______.

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