UK Clinical Aptitude Test (UKCAT) Practice Test

What is "electroplating" primarily used for?

1. To mold metals into shapes

2. To cover metal with a thin layer of another metal

3. To join metals together

4. To extract metal from ores

The correct answer is: To cover metal with a thin layer of another metal

Electroplating is a process used to deposit a layer of metal onto a surface, usually a base metal, to provide several benefits such as enhanced appearance, corrosion resistance, and reduced wear. The technique involves using electrical current to enable the movement of metal cations from a solution to the surface being plated. The purpose of electroplating primarily revolves around its ability to cover a substrate with a thin layer of another metal, which can improve the material's properties. For example, silver can be electroplated onto jewelry to improve its shine and appearance without the expense of using solid silver. Nickel is often used for corrosion resistance, while gold plating can be employed in electronic components to enhance conductivity. The other options are related to metalworking but do not accurately describe the specific function of electroplating. Molding metals into shapes involves casting or forging processes, joining metals together pertains to welding or soldering methods, and extracting metals from ores refers to metallurgy techniques rather than electroplating.