If a material has identical properties in all directions, it is said to be:
Try it first: pick an option, then read the explanation.
Correct answer: C. isotropic
Asked in SSC JE 25/01/2018 (Morning)
Detailed Explanation
Two words are often confused: homogeneous (same properties at every point) and isotropic (same properties in every direction at a point).
Why “isotropic” Is Correct
‘Identical properties in all directions’ is the definition of isotropic. Steel is close to isotropic; timber is not — it is much stronger along the grain.
Why the Other Options Are Wrong
- A. homogeneous: Homogeneous means the same at every point, not in every direction.
- B. elastic: Elastic means it recovers its shape after unloading.
- D. None of these: Isotropic is listed.
Key Point
Isotropic: same in all directions. Homogeneous: same at all points.
Key Concepts for Students
- Timber and composites are anisotropic (orthotropic).
- Rolled steel plates are nearly isotropic.
- Concrete is treated as homogeneous and isotropic in design.
Practice more: this is question 30 in Stress and Strain MCQs – Part 2. Try the whole set and check every answer instantly.