Which of the following are examples of ferrous metals?

• A. Cold rolled steel, iron and stainless steel
• B. Aluminum, titanium and copper
• C. Brass, bronze and tin
• D. Magnesium and silicon

Answer: (A)

Ferrous metals are metals that contain iron. This group includes iron itself, as well as steels and stainless steel, which are iron-based alloys. Cold rolled steel, iron, and stainless steel fit this category because each contains iron in some form, giving them typical ferrous properties like strength and, in many cases, magnetic behavior.

The other options do not fit because they are built from metals that do not contain iron: aluminum, titanium, and copper are non-ferrous; brass and bronze are copper alloys without iron; magnesium is a light metal and silicon is a metalloid, neither of which are ferrous.