Civil Engineering: Mechanics of Solid (MOS) MCQs

1. Question

The Poisson’s ratio is defined as

 |axial stress/lateral stress|
 |lateral strain/axial strain|
 |lateral stress/axial stress|
 |axial strain/lateral strain|

Answer
2. Question

Two people weighing W each are sitting on a plank of length L floating on water at L/4 from either end. Neglecting the weight of  the plank, the bending moment at the centre of the plank is

 WL/4
 WL/16
 WL/32
 zero

Answer
3. Question

The major and minor principal stresses at a point are 3MPa and -3MPa respectively. The maximum shear stress at the point is

 Zero
 3MPa
 6MPa
 9MPa

Answer
4. Question

The number of independent elastic constants for a linear elastic isotropic and homogeneous material is

 4
 3
 2
 1

Answer
5. Question

The effective length of a column of length L fixed against rotation and translation at one end and free at the other end is

 0.5 L
 0.7 L
 1.414 L
 2 L

Answer
6. Question

A solid circular shaft of diameter d and length L is fixed at one end and free at the other end. A torque t is applied at the free end. The shear modulus of the material is G. The angle of twist at three free ends is

 16TL/ π d^4 G
 32TL/ π d^4 G
 64TL/ π d^4 G
 128TL/ π d^4 G

Answer
7. Question

A disc of radius r has a hole of radius r/2 cut-out as shown. The centroid of the remaining disc (shaded portion) at a radial distance from the centre “O” is

Untitled

 r/2
 r/3
 r/6
 r/8

Answer

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