NCIDQ IDFX Practice Exam

What is a notable property of brass and bronze?

1. They are entirely made of aluminum

2. Predominantly copper

3. They are completely waterproof

4. They are lighter than steel

The correct answer is: Predominantly copper

Brass and bronze are both alloys primarily made from copper, which gives them notable properties and uses. Brass typically consists of copper and zinc, while bronze is primarily composed of copper and tin, although other elements may also be added to enhance specific characteristics. This predominance of copper is a key factor in the physical and aesthetic qualities of both materials, such as their corrosion resistance, durability, and malleability. The unique properties attributed to copper in these alloys make them favored for various applications, from construction to artistic endeavors. While aluminum is referenced in one of the choices, it does not relate to the composition of brass or bronze. The claim that these metals are waterproof is misleading, as while they are resistant to corrosion, they are not impermeable to water. Additionally, while they are lighter than some metals like steel, that is not a defining characteristic nor as significant as their copper content in terms of their properties. Thus, the emphasis on the predominance of copper truly encapsulates the essence of what makes brass and bronze distinct among metal alloys.