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Practice Exercise: Stress & Strain

Total questions: 15

Worksheet time: 1hrs 15mins

Name
Class
Date
1.

A cylindrical rod of cross-sectional area A experienced pressure p due to a compressive force F. If the force applied is reduced to one-third what happens to pressure?

a)

also reduced to one-third

b)

tripled

c)

remains the same

2.

What relationship exists between applied force and strain?

a)

direct

b)

indirect

c)

none at all

3.

This refers to the ratio of tensile stress to tensile strain.

a)

Bulk Modulus of elasticity

b)

Shear Modulus of Rigidity

c)

Young's Modulus of elasticity

4.

Given the Young's modulus of elasticity below rank the metals according to the magnitude of tensile stress it can hold from highest to lowest.

Aluminum 69 GPa

Brass 125 GPa

Steel 200 GPa

a)

Aluminum, Brass, Steel

b)

Brass, Aluminum, Steel

c)

Steel, Brass, Aluminum

5.

What is the correct label for A and B shown in the figure below?

a)

A - Tension; B- Compression

b)

A - Compression; B - Tension

c)

A - Torsion; B - Tension

6.

The bulk modulus of three materials are listed below. Arrange them from highest to lowest compressibility.

A : 2 x 1010 N/m2

B : 4 x 1010 N/m2

C : 10 x 1010 N/m2

a)

A, B, C

b)

B, C, A

c)

C, B, A

7.

Compressibility is the inverse of bulk modulus.

a)

True

b)

False

8.

How much force is required to shear off a metal sheet whose thickness is 2mm and width of 40cm? The shear stress is 5 x 107 N/m2.

a)

400 kN

b)

40 kN

c)

4 kN

9.

A 5cm cube of substance has its upperface displaced by 0.65cm by a tangential force of 0.25N. Calculate the modulus of rigidity.

a)

769 Pa

b)

7.69 Kpa

c)

769 MPa

10.

A nylon string, has a diameter of 2mm, is pulled by a force of 100N. Determine the stress.

a)

315 MPa

b)

31.5 MPa

c)

3.15 MPa

11.

A 1-m long cord is pulled by a force causing its length to change by 2mm. Determine the strain.

a)

0.2

b)

0.02

c)

0.002

12.

A concrete has a height and unit area of 5 m and 3sq.m., respectively. If it supports a mass of 30,000 kg and its height changes by 0.025mm, what is its modulus of elasticity of this concrete?

a)

2.00 GPa

b)

19.6 GPa

c)

2.00 MPa

13.

Which of the following does NOT determine shear modulus?

a)

Force

b)

Area

c)

Shear strain

d)

Volume

14.

Increasing shearing force on a steel metal sheet results to lesser shear strain.

a)

True

b)

False

15.

Which is the correct equation to find the change in length of a cylindrical metal rod the experience a tensile stress?

a)

A

b)

B

c)

C