# 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