Question detail

What is the primary advantage of using alloys over pure metals?

Try the question, check the answer, then read the explanation to understand the curriculum point.

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At a glance

MCQ

Type

practice

Style

Topic

Using materials

Question

A. Alloys are always lighter
B. Alloys have improved strength and resistance to corrosion
C. Alloys are cheaper to produce
D. Alloys are always more malleable

Answer

The correct option is Alloys have improved strength and resistance to corrosion. This answer is correct because it matches the approved learning objective to explain how material properties are related to uses and select suitable materials from given information. (Chemistry only) in the subtopic Ceramics, polymers and composites.

Explanation

The correct option is Alloys have improved strength and resistance to corrosion. Alloys have improved strength and resistance to corrosion is correct because it directly supports the approved learning objective to explain how material properties are related to uses and select suitable materials from given information. (Chemistry only). This belongs to the subtopic Ceramics, polymers and composites within Using materials, so the explanation must stay tied to that curriculum context. The other options are incorrect because they either do not answer this learning objective, use a vague statement, or move away from Ceramics, polymers and composites.

Common mistake

Misinterpreting density as the sole factor for material selection

Students often think that a material’s density alone determines its suitability for a particular use, ignoring other properties such as strength, thermal conductivity or corrosion resistance.

Explain that while density is important, other properties like mechanical strength, hardness, thermal expansion, electrical conductivity and resistance to corrosion must also be considered when matching a material to a specific application. Use examples such as aluminium alloys being chosen for aircraft parts because of their low density combined with adequate strength, not just because they are light.

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