FREE Agricultural/Bioengineering Strength of Materials Questions and Answers

Question 1

What is a material's characteristic that allows it to be pulled into thin wires?

Accepted Answer

Ductility

Answer

Elasticity

Answer

Plasticity

Answer

Malleability

Question 2

It is referred to as ___________ if the material has the same elastic characteristics in all directions.

Accepted Answer

Isotropic

Answer

Homogeneous

Answer

Plastic

Answer

Elastic

Question 3

Why does stress not qualify as a fundamental feature yet strain does?

Accepted Answer

Because it’s value is calculated in the laboratory

Answer

No stress is the fundamental property

Answer

Because it is dimensionless

Answer

Because it is a ratio

Question 4

The term for a material in which significant deformation is feasible prior to complete failure by rupture is

Accepted Answer

Ductile

Answer

Brittle

Answer

Plastic

Answer

Elastic

Question 5

What is the elastic bulk modulus?

Accepted Answer

The ratio of direct stress to volumetric strain

Answer

The ratio of volumetric stress to volumetric strain

Answer

The ratio of direct stress to direct strain

Answer

The ratio of shear stress to shear strain

Question 6

How many elastic constants will there be in an isotropic, linear material?

Accepted Answer

2

Answer

3

Answer

4

Answer

4

Question 7

Materials with an orthotropic structure have layers, such plywood or wood. For these materials, there are 9 independent elastic constants. Materials that are anisotropic or non-isotropic have varied characteristics in each direction. They behave in a non-homogeneous way. There are 21 elastic constants. How many elastic constants will there be in a non-isotropic, non-homogeneous material?

Accepted Answer

21

Answer

15

Answer

9

Answer

20

Question 8

How can the bulk modulus (K) and rigidity modulus (G) be used to express the Poissons ratio?

Accepted Answer

(3K – 2G) / (6K + 2G)

Answer

(3K + 2G) / (6K – 2G)

Answer

(3K + 4G) /( 6K – 4G)

Answer

(3K – 4G) / (6K + 4G)

Question 9

If the Poissons ratio is equal to unity, the connection between Youngs modulus E and bulk modulus K will be .

Accepted Answer

E = -3K

Answer

K = 0

Answer

E = 0

Answer

K = -3E

Question 10

Which of the following answers is sufficient to compute the resulting change in diameter when a rod of length L and diameter D is subjected to a tensile load P?

Accepted Answer

Youngs modulus

Answer

Shear modulus

Answer

Both Youngs modulus and shear modulus

Answer

Poissons ratio