Question

Copper, a metal known from ancient times, has many uses, some of which are mentioned here. Can you pick the false one?

• A. As an alloy in high-speed drills
• B. In brass utensils and bronze statues
• C. In electric motor coils
• D. In tapes and water connections

Answer 1

The correct option is A As an alloy in high-speed drills

Copper is a good conductor of heat. When it is used in speed drills, because of friction, heat develops and it melts. Therefore, it is not used in speed drills.