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JAMB Physics 2008 Question 22

Question 22

Quantity of Heat

A block of aluminium is heated electrically by a 25 W heater. If the temperature rises by 10°C in 5 minutes, the heat capacity of the aluminium is

  1. A.850JK−1.
  2. B.750JK−1.
  3. C.650JK−1.
  4. D.500JK−1.
Show the answer and explanation

Answer: B (750JK−1.)

Explanation

Heat supplied = Pt = 25 × 300 = 7500 J. Heat capacity = heat ÷ temperature rise = 7500 ÷ 10 = 750 J K−1.