Which of the following is a category used to classify metals?

• A. Alloy
• B. Ferrous
• C. Non-ferrous
• D. Composite

Answer: (B)

Classifying metals by whether they contain iron is a fundamental way to group them. Ferrous metals are those that include iron, which gives them common characteristics such as magnetic properties and a tendency to rust. This broad category helps designers predict behavior like strength, ductility, and durability in everyday applications, from steels to cast irons.

Non-ferrous metals, which don’t contain iron, are another important group, but the term ferrous specifically points to iron-containing metals, making it a widely used category for metal classification. Alloy and composite describe types of materials rather than a direct category of metals: an alloy is a substance made by combining elements (and many ferrous metals are alloys, like steel), while a composite blends different materials to achieve new properties.