Questions and answers for exam Preparation

MCQs

Total Questions : 189 | Page 9 of 19 pages

Question 81. The component σz denotes __________

normal stress in x-direction
normal stress acting perpendicular to z-axis
shear stress acting perpendicular to z-axis
shear stress acting perpendicular to y-axis

Discuss Question

Answer: Option B. -> normal stress acting perpendicular to z-axis
Answer: (b).normal stress acting perpendicular to z-axis

Question 82. The component τₓᵧ denotes ___________

normal stress in x-direction
normal stress perpendicular to y-axis
shear stress acting perpendicular to x-axis
shear stress acting perpendicular to y-axis

Discuss Question

Answer: Option C. -> shear stress acting perpendicular to x-axis
Answer: (c).shear stress acting perpendicular to x-axis

Question 83. The component τyz denotes ________

normal stress in x-direction
normal stress perpendicular to y-axis
normal acting perpendicular to x-axis
shear stress acting perpendicular to y-axis

Discuss Question

Answer: Option D. -> shear stress acting perpendicular to y-axis
Answer: (d).shear stress acting perpendicular to y-axis

Question 84. At a point, there are/is _________ normal stress.

Discuss Question

Answer: Option C. -> 3
Answer: (c).3

Question 85. The stresses due to self weight of the soil are known as ______________

geostatic stresses
boundary stresses
external stresses
boundary strain

Discuss Question

Answer: Option A. -> geostatic stresses
Answer: (a).geostatic stresses

Question 86. From the symmetry and orthogonality of principal planes ____________

both horizontal and vertical planes will be devoid of shear stress
both horizontal and vertical planes will have shear stress
only vertical plane has shear stress
only horizontal plane has shear stress

Discuss Question

Answer: Option A. -> both horizontal and vertical planes will be devoid of shear stress
Answer: (a).both horizontal and vertical planes will be devoid of shear stress

Question 87. If XY pane is considered to be ground surface and the z-axis as depth, then this condition is known as _______

semi-infinite
infinite
finite
semi- finite

Discuss Question

Answer: Option A. -> semi-infinite
Answer: (a).semi-infinite

Question 88. When there is no eternal loading, the principal is _______

5m below ground plane
ground plane
10m below ground plane
at infinity

Discuss Question

Answer: Option B. -> ground plane
Answer: (b).ground plane

Question 89. The vertical stress at a point within soil mass at a depth z is ____________

σz=γ+z
σz=γ-z
σz=γ/z
σz=γz

Discuss Question

Answer: Option D. -> σz=γz
Answer: (d).σz=γz

Question 90. The matrix form of the boundary condition equations is _____________

\(\begin{bmatrix} \overline{X}\\ \overline{Y}\\ \overline{Z} \end{bmatrix} = \begin{bmatrix} σ_{xx} & τ_{xy} & τ_{xz} \\ τ_{yx} & σ_{yy} & τ_{yz} \\ τ_{zx} & τ_{zy} & σ_{zz} \end{bmatrix} \begin{bmatrix} l \\ m \\ n \end{bmatrix}\)
\(\begin{bmatrix} \overline{X}\\ \overline{Y}\\ \overline{Z} \end{bmatrix} = \begin{bmatrix} σ_{zz} & τ_{xy} & τ_{xz} \\ τ_{yx} & σ_{yy} & τ_{yz} \\ τ_{zx} & τ_{zy} & σ_{xx} \end{bmatrix} \begin{bmatrix} l \\ m \\ n \end{bmatrix}\)
\(\begin{bmatrix} \overline{X}\\ \overline{Y}\\ \overline{Z} \end{bmatrix} = \begin{bmatrix} σ_{xx} & τ_{zz} & τ_{xz} \\ τ_{yx} & σ_{yy} & τ_{yz} \\ τ_{zx} & τ_{zy} & σ_{zz} \end{bmatrix} \begin{bmatrix} l \\ m \\ n \end{bmatrix}\)
\(\begin{bmatrix} \overline{X}\\ \overline{Y}\\ \overline{Z} \end{bmatrix} = \begin{bmatrix} σ_{xx} & τ_{yy} & τ_{xz} \\ τ_{yx} & σ_{yy} & τ_{yz} \\ τ_{zx} & τ_{yy} & σ_{zz} \end{bmatrix} \begin{bmatrix} l \\ m \\ n \end{bmatrix}\)

Discuss Question

Answer: Option A. -> \(\begin{bmatrix} \overline{X}\\ \overline{Y}\\ \overline{Z} \end{bmatrix} = \begin{bmatrix} σ_{xx} & τ_{xy} & τ_{xz} \\ τ_{yx} & σ_{yy} & τ_{yz} \\ τ_{zx} & τ_{zy} & σ_{zz} \end{bmatrix} \begin{bmatrix} l \\ m \\ n \end{bmatrix}\)
Answer: (a).\(\begin{bmatrix} \overline{X}\\ \overline{Y}\\ \overline{Z} \end{bmatrix} = \begin{bmatrix} σ_{xx} & τ_{xy} & τ_{xz} \\ τ_{yx} & σ_{yy} & τ_{yz} \\ τ_{zx} & τ_{zy} & σ_{zz} \end{bmatrix} \begin{bmatrix} l \\ m \\ n \end{bmatrix}\)