Answer: Change in dimension to original dimension.
- A Applied force to the cross-sectional area over which it acts
- B Change in dimension to original dimension
- C Applied stress to the material's Youngs modulus value
- D Total mass of the body to its occupied volume
Correct answer: B. Change in dimension to original dimension
Explanation: Strain is the fractional change in dimension (length, shape, or volume) and is dimensionless.
A typical stress-strain curve: the initial straight line (Hooke's Law region, slope = Young's modulus) ends at the elastic limit; beyond the yield point, deformation becomes permanent, peaking at the ultimate tensile strength before the wire finally fractures.
Concept context
Stress, strain, Hookes law, and the elastic moduli that describe how solids deform and recover under load.