Chemistry Questions

Which of the following is the best definition of elasticity?

• The rate at which a sample can distort its size and shape under a range of forces.

• Internal resistance/counterforce of a material to a distorting force.

• The intensity/degree of a distortion.

• Unit of measurement of an object’s resistance to being deformed elastically under a stress.

Which of the following best describes the measure of tensile strength?

• The rate at which a sample can distort its size and shape under a range of forces.

• Internal resistance/counterforce of a material to a distorting force.

• The intensity/degree of a distortion.

• Amount of stress that will cause permanent deformation or fracture.

What does it mean if the stress or strain is greater than the modulus of elasticity?

• The metal will be elastically deformed and will return to its original shape.

• The metal will be permanently deformed and will not return to its original shape.

• The modulus of elasticity must be increased by changing bonds in metal.

• Either the metal will be elastically deformed and return to its orignal shape OR permanently deformed and not return to its original shape depending on the type of metal.

Which of the following is the best definition of stress?

• The rate at which a sample can distort its size and shape under a range of forces.

• Internal resistance/counterforce of a material to a distorting force.

• The intensity/degree of a distortion.

• Unit of measurement of an object’s resistance to being deformed elastically under a stress.

Stress equals the ratio of ___ to ___.

• strain / elasticity

• elasticity / strain

• applied force / cross-sectional area

• cross-sectional area / applied force

Which type of stress occurs when the force pulls on two ends of the material?

• tensile stress

• compressive stress

• shear stress

• strain

Which type of stress occurs when the force pushes on two ends of the material?

• tensile stress

• compressive stress

• shear stress

• strain

Strain is the ratio of ___ to ___.

• deformation / original length

• original length / deformation

• elongation / original length

• original length / elongation

Which of the following best describes the modulus of elasticity?

• The rate at which a sample can distort its size and shape under a range of forces.

• Internal resistance/counterforce of a material to a distorting force.

• The intensity/degree of a distortion.

• Unit of measurement of an object’s resistance to being deformed elastically under a stress.

Elongation of a bar is directly proportional to ___ and inversely proportional to ___. 

• cross-sectional area / tensile force

• tensile force / cross-sectional area

• modulus of elasticity / stress

• stress / modulus of elasticity