What are the two types of metal classes?

The correct answer identifies the two broad categories of metals based on their iron content: ferrous and non-ferrous.

Ferrous metals contain iron and are known for their strength and magnetic properties. Common examples include steel and cast iron, which are widely used in construction and manufacturing due to their durability and ability to withstand high stresses. Non-ferrous metals, on the other hand, contain little to no iron, making them resistant to corrosion and lighter in weight. Examples include aluminum, copper, and lead. These non-ferrous metals are essential in various applications, especially when lightweight and resistance to rust are critical.

The other options, while relating to characteristics or types of materials, do not accurately represent the primary classification of metals. Physical and chemical refer to the properties of materials rather than their classification. Hard and soft represent variations in hardness as a property and do not define metal types. Brass and iron are specific types of metals rather than classifications; brass is a non-ferrous alloy, while iron falls under ferrous metals. Understanding these classifications is essential for material selection in engineering, manufacturing, and other fields.