# 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

r/2
r/3
r/6
r/8

`Answer`