PST472 T T

What is the primary purpose of a tensile test?

• • To measure the thermal properties of a polymer

• • To determine the strength and ductility of a material

• • To assess the color stability of a polymer

• • To evaluate the electrical conductivity of a polymer

In a tensile test, what is the term used to describe the maximum stress a material can withstand before breaking?

• • Yield strength

• • Ultimate tensile strength

• • Elastic limit

• • Modulus of elasticity

During a tensile test, what does the term "elongation" refer to?

• • The change in temperature during the test

• • The amount of stretch a material undergoes before breaking

• • The width of the material before the test

• • The thickness of the material after the test

Choose polymer property that can be measured in a tensile test.

• • Tensile strength

• • Elongation at break

• • Toughness

• • Stiffness

Which of the following terms refers to the point at which polymer undergoes permanent deformation during a tensile test?

• Yield strength

• Ultimate tensile strength

• Fracture point

• Initial point

What property is calculated by dividing the maximum force by the original cross-sectional area during a tensile test?

• Toughness

• Stress

• Strain

• Modulus

What is the name of the region in a stress-strain curve where the material deforms elastically?

• Plastic region

• Ductile region

• Elastic region

• Brittle region

Which polymer would typically show significant elongation before breaking in tensile strength?

• Polystyrene

• Polycarbonate

• Epoxy

• Polypropylene

What is the main objective of a tear test for polymers?

• • To determine the elasticity of a polymer

• • To measure the resistance of a material to propagation of a tear

• • To evaluate compression strength

• • To assess the material thickness

Which of the following factors can influence the tear resistance of a polymer?

• • Molecular weight

• • Processing conditions

• • Additives used in formulation

• • All of the above