Multiple choice

Which one of the following does not contain cooper as its constituent?

  1. Phosphor bronze

  2. Solder wire

  3. German silver

  4. Gun metal

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Solder wire is an alloy of tin and lead (or tin with other metals like silver, copper, antimony in lead-free solder). It does not contain copper. The other three alloys - phosphor bronze (Cu + Sn + P), german silver (Cu + Ni + Zn), and gun metal (Cu + Sn + Zn) all contain copper.