Question

Which property of solder makes it suitable for welding electrical wires?

• A. It's a low melting solid.
• B. It's a high melting solid.
• C. It's a bad thermal conductivity.
• D. None of these.

Answer 1

The correct option is A

It's a low melting solid.

The constituents of solder are lead (Pb) and tin (Sn). It contains 50% lead and 50% tin.
Being a low melting solid and has excellent electrical conductivity, it is used for soldering electrical wires together.