The stress-strain graph for a glass rod, up to the point at which it breaks, is shown below. [Figure 20.1] Which statement about the glass rod is correct?
✓ Correct Answer
The correct answer is A: Hooke's law is obeyed for all values of stress up to the breaking point.
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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