Question

Electric joints in electric circuits of radios, televisions, tape-recorders and related equipment are soldered, using solder which is made of:

• A. lead and aluminium
• B. tin and lead
• C. iron and copper
• D. aluminium and copper

Answer 1

Answer: (B)

tin and lead

Soldering is the use of a conductive substance with a low melting point (solder) to electrically connect components together. The alloy solder can be made by heating together the metals lead and tin used to create electrical joints. The composition of tin and lead in solder is $63\%$ and $37\%$ respectively.