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JAMB Physics 2006 Question 42

Question 42

Heat Transfer

The thermos flask is designed to

  1. A.prevent heat gain by conduction, convection and radiation.
  2. B.prevent heat loss by conduction, convection and radiation.
  3. C.prevent heat loss or gain by conduction, convection and radiation.
  4. D.store hot tea or water.
Show the answer and explanation

Answer: C (prevent heat loss or gain by conduction, convection and radiation.)

Explanation

The vacuum, silvered walls and stopper cut down heat transfer in both directions, so a flask keeps hot things hot and cold things cold.