Question

Gun-metal contains around _______________ copper.

(a) 9-11%

(b) 0.2%

(c) 86-89%

(d) 5-10%

This question was posed to me in an interview for job.

This intriguing question originated from Properties of Copper and its Alloys-2 in chapter Copper and its Alloys of Aerospace Materials & Processes

Answer 1

Right answer is (c) 86-89%

For explanation: Gun-metal includes around 86-89 per-cent of copper. It is also made of various elements like zinc, tin, lead, copper, etc. Gun-metal contains around 86-89% per-cent of copper and a maximum of 2 per-cent of lead.