Mechanical Properties of Materials Quiz

What is the SI unit of force?

• Watt (W)

• Pascal (Pa)

• Newton (N)

• Joule (J)

What is the maximum occlusal force range for adult teeth?

• 400 to 5000 N

• 300 to 4000 N

• 200 to 3500 N

• 100 to 2000 N

What does stress represent in materials?

• Force per unit area

• Total force applied

• Energy absorbed

• Deformation of the material

What is the definition of strain?

• Fractional change in dimensions

• Change in force

• Total stress applied

• Energy per unit volume

What is the proportional limit?

• Maximum stress before fracture

• Maximum stress up to which stress is proportional to strain

• Stress at which material yields

• Stress at which permanent deformation begins

What does ductility refer to?

• Ability to return to original shape

• Resistance to fracture

• Ability to withstand stress

• Ability to deform under tensile stress

What is resilience in materials?

• Resistance to fracture

• Energy required to deform to proportional limit

• Total energy absorbed before failure

• Maximum stress before yielding

What does toughness indicate?

• Elastic limit of the material

• Maximum load before yielding

• Energy required to cause fracture

• Resistance to permanent deformation

What is the significance of yield stress?

• Indicates proportional limit

• Indicates elastic limit

• Indicates when permanent deformation begins

• Indicates maximum load before fracture

What is the relationship between stress and strain in elastic deformation?

• Directly proportional

• Inversely proportional

• Exponential relationship

• Not proportional