Which term denotes a material made from two or more constituents with differing properties?

• A. Composite
• B. Alloy
• C. Mixture
• D. Solution

Answer: (A)

A material formed from two or more constituents that keep their distinct identities inside a single structure is a composite. The defining idea is that the different components contribute different properties, and the combination yields a material with characteristics that differ from its individual parts—often with improved strength, stiffness, or toughness. Think of reinforced concrete, where steel adds strength to concrete, or fiberglass, where glass fibers boost stiffness in a polymer matrix.

A mixture and a solution don’t fit this idea because they don’t create a new material with distinct phases that work together; their components can blend or separate and don’t form a single, unified material with new properties. An alloy is a related concept, especially for metals, but it typically results in a homogeneous material at the atomic level, where the original constituents don’t remain as separate, identifiable phases within the final product.