Multiple choice general knowledge math & puzzles

Which of the following is not a good heat insulator?

  1. Wood

  2. Wool

  3. Feathers

  4. Iron
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Iron is a metal, and metals are generally excellent conductors of heat due to the presence of free electrons. Wood, wool, and feathers are poor conductors (good insulators) because they trap air or lack mobile charge/energy carriers.

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