Wiring and componentsQuestion 459 of 1506

A solder is marked 60/40. What does this mean?

  1. 60% lead and 40% tin by weight
  2. 60% tin and 40% lead by weight
  3. 60% flux and 40% tin
  4. 60 W and 40 W heating
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Correct answer: 60% tin and 40% lead by weight

The tin content is always stated first.

Source: Electrical Fundamentals Competency (Industry Training Authority of BC), 10.1: Solder Bonding

Practice wiring and components

Questions last reviewed: 18 October 2026