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JAMB Physics 1985 Question 23

Question 23

Heat Transfer

Two thermos flasks of volume Vx and Vy are filled with liquid water at an initial temperature of 0°C. After some time the temperature were found to be θx, θy respectively. Given that Vx/Vy = 2 and θx/θy = ½, the ratio of the heat flow into the flasks is

  1. A.¼
  2. B.½
  3. C.4
  4. D.1
  5. E.2
Show the answer and explanation

Answer: D (1)

Explanation

Heat = mass × c × temperature rise, and mass is proportional to volume. The ratio is 2 × ½ = 1.