Name two finishes used on metal surfaces and their purposes.

• A. Sanding for aesthetic and buffing for conductivity.
• B. Polishing to reduce cost and plating to degrade hardness.
• C. Anodising (improves hardness and corrosion resistance) and electroplating (improves appearance and wear resistance).
• D. Painting to increase magnetic properties and anodising to change color only.

Answer: (C)