JEE Main 24 Feb 2021 Shift 1 Solved Paper

'Gun metal' also called as red brass (in USA). It is greyish in colour and originally used for making guns. The major components of 'Gun metal' are
Cu=87%
Zn=3%
Sn=10%
It is also used in manufacturing of gears and bearing that are to be subjected to heavy loads and low speeds.