Geotechnical Engineering

Mohrs Stress Circle

Question 1
Marks : +2 | -2
Pass Ratio : 100%
The shear strength in cohesion less soil is due to ___________
Internal friction
Cohesion
Inter granular friction
Inter particle force
Explanation:
The shear strength in cohesion less soils from inter granular friction, while in other soils it results both from internal friction as well as cohesion.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
The circle obtained from two dimensional stress system is known as ________
Principal stress circle
Mohr circle
Shearing stress circle
None of the mentioned
Explanation:
The circle drawn from two dimensional stress systems is known as Mohr’s circle of stress (Mohr, 1870).
Question 3
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Pass Ratio : 100%
The planes that exist in soil mass is ______________
Principal plane
Principal stress
Stress plane
None of the mentioned
Explanation:
In a loaded soil mass, there exist three typical planes, mutually orthogonal to each other. These planes are called the principal planes.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
Stress component on planes of a loaded soil mass depends upon ____________
Stress acting on plane
Direction of plane
Shearing resistance
All of the mentioned
Explanation:
Through a point in a loaded soil mass, innumerable planes passes and stress component on each plane depends upon the direction of the plane.
Question 5
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Pass Ratio : 100%
The maximum shear stress Ï„max, for a soil mass is equal to ___________
(σ1 – σ3 )/2
(σ1 + σ3 )/2
(σ1×σ3 )/2
(σ3 – σ1 )/2
Explanation:
The maximum shear stress τmax is equal to (σ1 – σ3)/2 which occurs on planes with α= 45°.
Question 6
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Pass Ratio : 100%
The failure condition for a soil can be expressed in terms of limiting shear stress, called __________
Principal stresses and Shear strength
Shearing resistances
None of the mentioned
All of the mentioned
Explanation:
The failure conditions for a soil may be expressed in terms of limiting stress, called shear strength or as a function of the principal stresses.
Question 7
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Pass Ratio : 100%
The shear deformation of soil in a building can cause ___________ of the following?
Sinking of footing
Slide in an earth embankment
Movement of wedge
All of the mentioned
Explanation:
Shearing deformation of soil may be in the form of the sinking of a footing, or movement of a wedge of soil particles or on masses upon the action of shear stress.
Question 8
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Pass Ratio : 100%
The shearing resistance of a soil is constituted by ___________
Structural resistance and Frictional resistance
Shearing strength
None of the mentioned
All of the mentioned
Explanation:
The shearing resistance of soil is constituted by
Question 9
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The normal stresses acting on planes of the soil are known as _____________
Major principal stresses
Principal stresses
Minor principal stresses
Principal planes
Explanation:
The normal stresses acting on principal planes are called the principal stresses.
Question 10
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Pass Ratio : 100%
Major principal stress in a soil is represented by the symbol ________________
σ1
σ2
σ3
σ4
Explanation:
Major, intermediate and minor principal stresses are represented by the corresponding symbols σ1, σ2, and σ3.