Test: Mohr Coulomb's Failure Theory - Civil Engineering (CE) MCQ

# Test: Mohr Coulomb's Failure Theory - Civil Engineering (CE) MCQ

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## 10 Questions MCQ Test Soil Mechanics - Test: Mohr Coulomb's Failure Theory

Test: Mohr Coulomb's Failure Theory for Civil Engineering (CE) 2024 is part of Soil Mechanics preparation. The Test: Mohr Coulomb's Failure Theory questions and answers have been prepared according to the Civil Engineering (CE) exam syllabus.The Test: Mohr Coulomb's Failure Theory MCQs are made for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Mohr Coulomb's Failure Theory below.
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Test: Mohr Coulomb's Failure Theory - Question 1

### The curve obtained by plotting the normal and shear stress is called as ___________

Detailed Solution for Test: Mohr Coulomb's Failure Theory - Question 1

If the normal and shear stress corresponding to failure are plotted, then a curve is obtained. The plot or curve is called the strength envelope.

Test: Mohr Coulomb's Failure Theory - Question 2

### The critical shear stress causing failure of material depends upon ____________

Detailed Solution for Test: Mohr Coulomb's Failure Theory - Question 2

According to Mohr’s strength theory, the critical shear stress causing failure depends upon the properties of the materials as well as on normal stress on the failure plane.

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Test: Mohr Coulomb's Failure Theory - Question 3

### The Mohr-Coulomb theory can be expressed algebraically by, which of the following equation.

Detailed Solution for Test: Mohr Coulomb's Failure Theory - Question 3

The Mohr-Coulomb failure theory can be expressed algebraically by the equation:τf = s = F (σ)
Where, τf = s=shear stress on failure plane, at failure=shear resistance of material
F (σ) = function of normal stress.

Test: Mohr Coulomb's Failure Theory - Question 4

The Mohr-Coulomb failure criterion, which is defined by shear strength (s) consisting of effective normal stress (σ’), cohesion (c’) and effective angle of friction (ϕ’), is given by,

Detailed Solution for Test: Mohr Coulomb's Failure Theory - Question 4

Concept:
Shear strength of soil is the capacity of soil to resist shearing stresses.  It can be defined as the maximum value of shear stress that can be mobilized within a soil mass.

Note:
If this value exceeded by the shear stress on any plane or a surface at a point, failure will occur in soil because of the movement of a portion of the soil mass along that particular plane. The soil is then said to fail in shear. Therefore, shear strength generally represented the strength of the soil.
As per Mohr-Coulomb criteria, Shear strength (s) of soil is given as:
s = c' + σ' tanϕ'
Where,
c' = effective cohesion
σ' = effective normal stress
ϕ' = effective angle of friction

Test: Mohr Coulomb's Failure Theory - Question 5

Mohr envelope can be considered to be straight if the angle of internal friction φ is assumed to be __________

Detailed Solution for Test: Mohr Coulomb's Failure Theory - Question 5

Mohr envelope can be considered straight if the angle of internal friction φ is assumed to be a constant.

Test: Mohr Coulomb's Failure Theory - Question 6

The parameter φ in coulomb’s equation “S = c + σ tan φ”, represents ___________

Detailed Solution for Test: Mohr Coulomb's Failure Theory - Question 6

The empirical constant φ in coulomb’s equation represents angle of internal friction or shearing resistance respectively.

Test: Mohr Coulomb's Failure Theory - Question 7

Which of the following is coulomb’s strength equation?

Detailed Solution for Test: Mohr Coulomb's Failure Theory - Question 7

Coulomb defined the function F (σ) as a linear function of σ and gave the following strength equation:
S = c + σ tan φ.

Test: Mohr Coulomb's Failure Theory - Question 8

Theory of failure, was first proposed by ____________

Detailed Solution for Test: Mohr Coulomb's Failure Theory - Question 8

The theory of failures was first expressed by coulomb in 1776 and later generalized by Mohr.

Test: Mohr Coulomb's Failure Theory - Question 9

According to Coulomb, the relationship between shear strength and normal stress could be represented by _________

Detailed Solution for Test: Mohr Coulomb's Failure Theory - Question 9

Coulomb considered that the relationship between shear strength and normal stress could be adequately represented by the straight line.

Test: Mohr Coulomb's Failure Theory - Question 10

Which of the following stresses does not have any influence on strength of a material?

Detailed Solution for Test: Mohr Coulomb's Failure Theory - Question 10

When a material is subjected to three dimensional stresses, the intermediate principal stress does not have any influence on the strength of material.

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## Soil Mechanics

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