JAMB Physics 2011 Objective — Question 15
Question 15 of 49 from the Joint Admissions and Matriculation Board (JAMB) Physics 2011 Objective paper, with the correct answer and a full explanation.
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A block of aluminium is heated electrically by a 30W heater. If the temperature rises by 10°C in 5 minutes, the heat capacity of the aluminium is
- A. A. 100 JK⁻¹
- B. B. 200 JK⁻¹
- C. C. 9003K⁻¹Correct
- D. D. 90JK⁻¹
Explanation
The heat energy supplied electrically equals the heat energy that raised the block's temperature: CΔθ = Power x time. Cx10 = 30x5x60. C = (30x5x60)/10 = 900JK⁻¹.
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