What should never be used in a microwave?

• A. Glass
• B. Metal
• C. Plastic wrap
• D. Paper towels

Answer: (B)

Microwaves heat food by making water molecules move, and metal doesn’t let those waves pass. Instead, metal reflects the microwaves, which can cause arcing (sparks) that may start a fire or damage the oven and its power source. That’s why metal items should not be placed in a microwave.

Glass is safe because it doesn’t conduct electricity and won’t interfere with the microwaves. Plastic wrap can be used if it’s labeled microwave-safe and is positioned to vent steam, so it doesn’t trap heat. Paper towels are fine for covering food to retain moisture, as long as they’re plain and not overly dry or used near a heat source.