Material Properties Quiz

What is the definition of stress in the context of materials science?

• The ability of a material to return to its original shape after deformation

• The resistance of a material to deformation

• The force applied per unit area within materials causing deformation

• The change in length of a material under load

What does strain represent in materials science?

• The resistance of a material to deformation

• The deformation of a material under stress

• The force applied per unit area within materials

• The ability of a material to return to its original shape after being stretched or compressed

How is Young's modulus calculated?

• Strain divided by stress

• Stress divided by strain

• Stress plus strain

• Stress times strain

On a stress-strain curve, what does the slope of the elastic region represent?

• Plastic deformation

• Young's modulus

• Ultimate tensile strength

• Yield strength

What is elastic deformation?

• Permanent deformation of a material when the stress is removed

• Temporary deformation that disappears when the stress is removed

• The maximum stress a material can withstand before failing

• The deformation that occurs at high temperatures

What characterizes plastic deformation?

• The deformation is fully reversible

• It occurs when the material is heated above its melting point

• The material returns to its original shape after the stress is removed

• The deformation is permanent and not reversible

What is the unit of stress?

• Newton

• Pascal

• Joule

• Meter

What is the unit of strain?

• Newton

• Pascal

• No unit (it's a ratio)

• Meter

Which of the following is NOT a characteristic of the stress-strain curve?

• The curve can show the point of fracture

• The curve always remains linear

• The curve can indicate the elastic limit

• The curve can show the yield point

What happens at the yield point on a stress-strain curve?

• The material fractures

• The material returns to its original shape

• The material begins to deform plastically

• The material no longer deforms