Technician exam question T7D08
Subelement T7, PRACTICAL CIRCUITS· Group T7D
Which of the following types of solder should not be used for radio and electronic applications?
- A.Acid-core solder (correct answer)
- B.Lead-tin solder
- C.Rosin-core solder
- D.Tin-copper solder
WhyAcid-core solder should not be used for radio and electronic applications. Acid-core solder contains a corrosive flux meant for plumbing and sheet-metal work, and that acid residue corrodes fine electronic conductors over time, so it should never be used in radio or electronic work, answer A. Lead-tin (B) and tin-copper (D) solders are common, appropriate alloys for electronics, and rosin-core (C) solder is specifically the non-corrosive flux type meant for this kind of work.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2026-2030 NCVEC Element 2 pool (public domain); the explanation above is original writing, see our methodology.
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