Oilers/Plant Tenders (HHC) Civil Service Practice Exam

Which of the following metals is considered non-ferrous?

1. Iron

2. Lead

3. Copper

4. Steel

The correct answer is: Copper

A metal is categorized as non-ferrous if it does not contain significant amounts of iron. Non-ferrous metals are valued for their unique properties, such as resistance to rust and corrosion, lighter weight, and better electrical conductivity. Copper is a classic example of a non-ferrous metal. It does not rust and is an excellent conductor of heat and electricity, making it widely used in electrical wiring, plumbing, and roofing. Additionally, copper's malleability allows it to be shaped into various forms without breaking, adding to its versatility in manufacturing and construction. In contrast, iron is ferrous due to its significant iron content, making it prone to rust. Steel, which is an alloy primarily made from iron and carbon, also falls into the ferrous category. Although lead is not iron-based, it is less commonly grouped with other non-ferrous metals for certain industrial uses and safety considerations. Understanding the classification of metals as ferrous or non-ferrous is essential for selecting materials in various applications, particularly in construction, electrical work, and manufacturing.