Why does a metal doorknob feel cooler to your hand than a carpet feels to your bare feet?

Because the metal doesn't hold heat as well as the carpet. The metal is a conductor and the carpet is an insulator.

Which of the following did you identify correctly

Non metal is an element or substance that is not a metal metal is a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivitymetalloid is an element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. they are electrical semiconductors.