The dimension of Young's Modulus is:
Correct answer: C. ML-1T-2
- A. M2L-1T2
- B. ML-1T-1
- C. ML-1T-2
- D. ML-2T-2
Explanation
Young's modulus is the slope of the initial section of the curve (i.e. m in y = mx + b). When a material reaches a certain stress, the material will begin to deform. It is up to a point where the structure of the material is stretching and not deforming. Unit of Young's Modulus =N/m2=kgm/s2m2=ms2kg=ML−1T−2.
This question appeared on the HEC Phase I 2017 paper, which you can sit online with every answer explained.
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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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