Correct option is B
Correct Option: A) Ultimate
The stress corresponding to the maximum load carried by a material before failure is known as the ultimate stress. This is taken as the standard measure of unit failure stress in strength of materials.
Ultimate stress represents the highest stress attained by the material in a tensile test before the load starts decreasing due to necking (in ductile materials) and finally leads to failure.
Analysis of Options
| Option | Explanation |
| A. Ultimate | Stress corresponding to maximum load before failure. Correct |
| B. Failure | General term, not a defined stress value. |
| C. Rapture | Incorrect spelling of rupture; refers to breaking stress, not standard for unit failure stress. |
| D. Fracture | Stress at breaking point, occurs after ultimate stress in ductile materials. |
Final Answer:
A) Ultimate
