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Alloys (copper-based): Which metals constitute gunmetal (traditional composition)? Think of the bronze used historically for guns/valves/bearings. Choose the correct ingredient set.

Difficulty: Easy

Copper, Tin
Iron, Zinc, Titanium
Iron, Tin
Iron, Brass, Tin

Correct Answer: Copper, Tin

Explanation:

Given data

Alloy: Gunmetal (a bronze).

Concept/Approach
Traditional gunmetal is a copper–tin bronze (often with a small percentage of zinc/lead in modern specs). Among the options given, the correct core constituents are copper and tin.

Final Answer
Copper, Tin

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