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JAMB Physics 1984 Question 27

Question 27

Quantity of Heat

Heat is supplied uniformly at the rate of 100 W to 1.0 × 10−2 kg of a liquid for 20 seconds. If the temperature of the liquid rises by 5°C, then the specific heat capacity of the liquid is

  1. A.2.0 × 102 J kg−1 K−1
  2. B.2.0 × 102 J kg−1
  3. C.4.0 × 104 J kg−1 K−1
  4. D.4.0 × 104 J kg−1
  5. E.8.4 × 103 J kg−1 K−1.
Show the answer and explanation

Answer: C (4.0 × 104 J kg−1 K−1)

Explanation

Heat = 100 × 20 = 2000 J. c = 2000/(0.01 × 5) = 4.0 × 104 J kg−1 K−1.