Quiz on Elasticity

What is stress?

• Force per unit volume

• Force per unit area

• Force per unit length

• Force per unit displacement

The unit of stress in the SI system is ________

• Pascal (Pa)

• Newton (N)

• Joule (J)

• Watt (W)

Which of the following describes strain?

• Change in length divided by original length

• Change in volume divided by original volume

• Change in area divided by original area

• All of the above

Strain is a_______________

• Quantity with dimensions of pressure

• Quantity with dimensions of length

• Quantity with dimensions of force

• Dimensionless quantity

Which of the following is true for Hooke’s Law?

• Stress is directly proportional to strain within elastic limit

• Stress is inversely proportional to strain

• Stress and strain are not related

• Stress is directly proportional to strain beyond elastic limit

Young's modulus is defined as ___________

• Ratio of stress to strain

• Ratio of strain to stress

• Ratio of stress to displacement

• Ratio of force to strain

The unit of Young’s modulus is __________

• N/m² (Pascal)

• N/m

• N/s

• J/m²

What type of stress is associated with stretching?

• Tensile stress

• Compressive stress

• Shear stress

• Thermal stress

In the equation for Young’s modulus (Y = σ/ε), what does σ represent?

• Strain

• Stress

• Displacement

• Elasticity

Compressive stress results in ____________

• Elongation of material

• Shortening of material

• Change in temperature

• Increase in density