WAEC Physics 2021 Objective — Question 12
Question 12 of 50 from the West African Examinations Council (WAEC) Physics 2021 Objective paper, with the correct answer and a full explanation.
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12. A metallic sphere is heated from 27°C to 200°C without change of state. Which of the following changes would have resulted from the heating?
- A. No changes occur in its volume and density
- B. Its volume increases and its density decreasesCorrect
- C. Its volume increases and its density increases
- D. Its volume increases without a change in density
Explanation
Heating expands the metal (volume increases). Since density=mass/volume and mass stays constant, density decreases.
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