Red Seal Metal Fabricator (Fitter) Practice Exam

Which of the following is a characteristic of non-ferrous metals?

1. They rust more easily

2. They are magnetic

3. They do not contain iron

4. They are less malleable

The correct answer is: They do not contain iron

Non-ferrous metals are defined specifically by the absence of iron in their composition. This characteristic is crucial because it directly affects their properties and applications. Non-ferrous metals such as aluminum, copper, lead, and zinc do not rust, unlike ferrous metals that contain iron and are prone to rusting when exposed to moisture and air. Additionally, many non-ferrous metals are valued for their lightweight, corrosion resistance, and conductivity, making them ideal for various engineering and manufacturing processes. The other options highlight common misconceptions about non-ferrous metals. While non-ferrous metals are not magnetic in most cases, there are some exceptions (such as certain types of stainless steel); however, the defining characteristic remains their lack of iron. Regarding malleability, non-ferrous metals are often more malleable than ferrous metals, allowing for greater flexibility in shaping and forming during fabrication. Lastly, the assertion that they rust more easily does not apply to non-ferrous metals; rather, they typically exhibit better resistance to corrosion compared to their ferrous counterparts. Therefore, the absence of iron is the key defining feature of non-ferrous metals.