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Free Practice Quiz Question List

4 Mechanical Behavior of Materials Online Quiz Questions

Use this free practice quiz with 20 questions to review 4 Mechanical Behavior of Materials, test your knowledge, and prepare for your next test or exam.

20 questions
01
True or false
1 point

After a specimen is unloaded, elastic deformation is recoverable, whereas plastic deformation leaves some residual strain. True or false?

  1. A

    True

  2. B

    False

02
Choose one
1 point

A tensile-test curve has an initial linear elastic region. Which property is represented by the slope of that region?

  1. A

    The maximum engineering stress reached during a tensile test

  2. B

    The slope of the linear elastic portion of a stress–strain curve

  3. C

    The amount of plastic deformation before fracture

  4. D

    Resistance to localized indentation of a surface

03
Fill in the blank
1 point

When stress is held approximately constant, the gradual increase in over time is called creep.

04
Choose all
1 point

Select all statements that correctly distinguish material stiffness from the stiffness of a particular component.

  1. A

    Young’s modulus describes a material’s resistance to elastic deformation.

  2. B

    Two rods made of the same material must stretch the same amount under the same force, regardless of their dimensions.

  3. C

    A longer or thinner rod can stretch more than a shorter or thicker rod made of the same material under the same force.

  4. D

    Young’s modulus alone specifies a component’s strength against every type of failure.

05
True or false
1 point

Ductility describes the extent of plastic deformation a material can undergo before it fractures. True or false?

  1. A

    True

  2. B

    False

06
Choose one
1 point

A tensile specimen has undergone substantial deformation and begun to neck. Which area is used to calculate its engineering stress?

  1. A

    The area at the narrowest point after necking

  2. B

    The specimen’s current area at the time of measurement

  3. C

    The specimen’s original cross-sectional area

  4. D

    The area change caused by plastic deformation

07
Fill in the blank
1 point

When a viscoelastic material is held at a fixed deformation and the stress it sustains decreases, the response is called .

08
Choose all
1 point

Select all statements that accurately describe hardness and its measurement.

  1. A

    Hardness can be assessed by pressing an indenter into a surface.

  2. B

    A high hardness value by itself establishes that a material is tough.

  3. C

    Brinell, Vickers, and Rockwell are common indentation methods.

  4. D

    Hardness is not interchangeable with strength, toughness, or ductility.

09
Choose one
1 point

A tensile-test curve reaches a peak before the specimen fractures. What does that peak represent?

  1. A

    The stress at which all elastic behavior ends

  2. B

    The maximum engineering stress reached in the tensile test

  3. C

    The stress at which a specimen first returns to its original shape

  4. D

    The energy absorbed per unit volume up to fracture

10
Choose one
1 point

A material’s tensile curve has no sharp yield point. Which approach is commonly used to report its yield strength?

  1. A

    Use the hardness value as a substitute for yield strength.

  2. B

    Report the ultimate tensile strength as the yield strength.

  3. C

    Use a specified offset method, such as the 0.2% offset method.

  4. D

    Assume the material has no yield strength.

11
Open ended
1 point

A designer chooses a material because its Young’s modulus is higher than that of another candidate. Explain what this comparison tells the designer about elastic deformation and why it does not, by itself, establish which material is stronger.

12
True or false
1 point

True or false: A material that resists indentation must also be tough and absorb substantial energy before fracture.

  1. A

    True

  2. B

    False

13
Choose one
1 point

A component is held under approximately constant tensile stress, and its strain gradually increases over time. Which term describes this behavior?

  1. A

    Stress relaxation

  2. B

    Creep

  3. C

    Elastic recovery

  4. D

    Hardness

14
Written response
1 point

What property describes the extent of plastic deformation a material can undergo before it fractures?

15
Choose one
1 point

Two rods made of the same material carry the same axial tensile force. Rod A is longer and thinner than rod B. Which statement best predicts their relative stretching?

  1. A

    Rod A stretches less because it is longer and thinner.

  2. B

    Both rods stretch by the same amount because they are made from the same material.

  3. C

    Rod A stretches more because it is longer and thinner.

  4. D

    Neither rod stretches because the force is the same.

16
Choose one
1 point

On a tensile stress–strain curve, what property is indicated by the peak engineering stress?

  1. A

    Yield strength

  2. B

    Ultimate tensile strength

  3. C

    Young’s modulus

  4. D

    Hardness

17
Written response
1 point

A specimen’s initial length is 250 mm250\,\mathrm{mm}. Under tension, its length increases to 251.25 mm251.25\,\mathrm{mm}. What is its axial engineering strain?

18
Choose one
1 point

A polymer is held at a fixed deformation, and the stress it sustains decreases over time. What behavior does this illustrate?

  1. A

    Stress relaxation

  2. B

    Creep

  3. C

    Plastic deformation

  4. D

    Ultimate tensile strength

19
Written response
1 point

A specimen with an original cross-sectional area of 400 mm2400\,\mathrm{mm}^2 is loaded with an axial tensile force of 24 kN24\,\mathrm{kN}. Calculate its average engineering stress in MPa.

20
Written response
1 point

What combined category of effects should be considered when predicting a material’s performance over years at elevated temperature?