Which one of the following physical quantity does not have the dimension of force per unit area:
Correct answer: B. Strain
- A. Stress
- B. Strain
- C. Young modulus
- D. Pressure
Explanation
The strain unit is dimensionless. It is the ratio between the length shift and the initial length, so it is unit-less. Thus B, strain, is the correct option
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About Young's Modulus and Stress-Strain
Stress and strain describe how a solid deforms under an applied force, while Young's modulus is the ratio of tensile stress to tensile strain within the elastic limit. The topic includes elastic and plastic behaviour, Hooke's law, the stress strain graph and the difference between stiffness, strength and breaking stress.
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