WAEC Physics 2017 Objective — Question 1
Question 1 of 50 from the West African Examinations Council (WAEC) Physics 2017 Objective paper, with the correct answer and a full explanation.
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Which of the following properties of a long steel bar would alter if the bar were melted, recast into a cube and allowed to cool to its original temperature?
- A. A. Density
- B. B. Volume
- C. C. Specific heat capacity
- D. D. Electrical resistanceCorrect
Explanation
Recasting into a different shape changes the length and cross-sectional area, altering electrical resistance (R=ρl/A), even though density, volume and specific heat capacity remain the same.
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