Question

Consider the following salient points in a stress-strain curve of mild steel bar: (A) Yield point
(B) Breaking point
(C) Proportionality limit
(D) Ultimate point
The correct sequence in which they occur while testing the mild steel bar in tension from initial zero strain to failure is:

• A. (A), (B), (C), (D)
• B. (A), (B), (C) only
• C. (C), (A), (D), (B)
• D. (B), (C) and (D) only

Hint:

In a stress-strain curve, the yield point comes first, followed by the proportional limit, ultimate point, and finally the breaking point.

Answer 1

The Correct Option is A

Step 1: Key Points of the Stress-Strain Curve
- (A) Yield Point: The point at which the material begins plastic deformation.
- (B) Breaking Point: The point at which the material fails.
- (C) Proportionality Limit: The point where stress and strain are proportional before yielding.
- (D) Ultimate Point: The maximum stress the material can withstand.

Step 2: Conclusion
The correct sequence of events when testing a mild steel bar is: (A) Yield Point, (B) Breaking Point, (C) Proportionality Limit, and (D) Ultimate Point. Thus, option (1) is the correct answer.

Final Answer:
\[ \boxed{1. \, (A), (B), (C), (D)} \]