Quiz on Stress and Strain

Stress is defined as:

• Force × Area

• Force / Volume

• Force / Area

• Area / Force

The SI unit of stress is:

• Pascal

• Newton

• Watt

• Meter

If a rod is stretched and its length increases, it experiences:

• Compressive strain

• Tensile strain

• Shear strain

• Torsional strain

Strain is:

• Ratio of force to area

• Change in volume

• Ratio of change in length to original length

• Force per unit volume

Shear stress acts:

• Perpendicular to the surface

• Parallel to the surface

• At 45° to the surface

• Vertically upward

Which of the following expresses shear stress?

• τ = F × A

• τ = F / A

• τ = A / F

• τ = F / V

The factor of safety is defined as:

• Working stress / Ultimate stress

• Yield stress / Working stress

• Ultimate or yield stress / Working stress

• Ultimate stress × Working stress

A high factor of safety indicates:

• Unsafe design

• Economical design

• Over-designed or conservative system

• Minimum material usage

In engineering design, working stress is:

• Equal to yield stress

• Greater than ultimate stress

• Less than yield stress

• More than factor of safety

If a force of 1000 N acts on a 0.01 m² area, the stress is:

• 10 Pa

• 1000 Pa

• 10,000 Pa

• 100 Pa