Question

The diagram shows a stress-strain graph for a rubber band. Consider of the following statements. I. It will be easier to compress this rubber than expand it. II. Rubber does not return to its original length after it is stretched. III. The rubber band will get heated if it is stretched and released. Which of these can be deduced from the graph

• A. III only
• B. II and III
• C. I and III
• D. I only

Answer 1

Answer: (B)

II and III

Answer 2

The stress-strain graph shows a hysteresis loop. Statement II is true because the loop does not close at the origin, indicating residual strain. Statement III is true because the area of the hysteresis loop represents energy dissipated as heat. Statement I cannot be deduced as the graph only shows expansion, not compression.