WAEC Physics 2020 Objective — Question 43
Question 43 of 50 from the West African Examinations Council (WAEC) Physics 2020 Objective paper, with the correct answer and a full explanation.
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Which of the following statements about the process of melting of a solid are true? I. The temperature of the solid will remain steady until melting starts. II. keep rising until melting starts. III. Remain steady as melting proceeds. IV. Keep rising as melting proceeds.
- A. II and III onlyCorrect
- B. III and IV only
- C. I, II and III only
- D. II, III and IV only
Explanation
During melting of a pure solid, the temperature keeps rising until melting starts (II), then remains steady (constant) as melting proceeds (III), matching the melting curve of a pure solid.
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