Multiple choice general knowledge

Which of the following substances is a badconductor of electricity but a good conductor of heat?

  1. Asbestos

  2. Celluloid

  3. Purspecks

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

Mica is an excellent thermal conductor but a poor electrical conductor, making it ideal for electrical insulation applications that require heat dissipation. It has a layered structure with high thermal conductivity along the planes but resists electrical flow. This unique property combination makes mica valuable in electrical equipment like capacitors, heating elements, and insulators. Asbestos and celluloid are insulators for both heat and electricity, while Perspecks (likely Perspex/acrylic) is an electrical insulator.

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