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Leaving Certificate Technology – Materials Practice Test

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Solder is a metallic alloy used to join two metal surfaces. Which option describes solder?
Correct Answer:
Metallic alloy of tin and lead that is used to join two metal surfaces.
Explanation:
Solder is a filler metal chosen to join metal parts by melting, flowing into the gap between surfaces, and then solidifying to form a bond. It’s typically a tin-based alloy, often with lead, which gives it a low melting point so it can melt without warping the pieces being joined. This makes it ideal for creating a strong, conductive joint between metal surfaces. So, describing solder as a metallic alloy of tin and lead used to join two metal surfaces exactly captures its composition and purpose. The other options aren’t correct because natural fibre and plastic are non-metal materials, and brass is a copper-zinc alloy that isn’t used as a low-m melting filler metal for joining surfaces.

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