Q1. A teacher presents this situation: 'Two identical iron nails are kept for a week, one in dry air and one partly dipped in salt water. Why does one rust faster?' Students list possible causes, choose what evidence is needed, plan a comparison, and revise their answer after results. Which method is most precisely represented?
Explanation
The problem solving method begins with a felt difficulty or puzzling situation and proceeds through analysis, hypothesis formation, collection or use of relevant evidence, and testing or revision. The nail-rusting task is not merely an illustration of a known law; it requires learners to identify variables such as moisture and salts, design a comparison, and defend a conclusion. That makes the method more exact than simply calling it a demonstration.
