Which of the following elements are included in stainless steel?

Which one of the following metal is NOT an essential component in stainless steel?

Which among the following are constituents of brass?

Which of the following elements is added to iron to produce steel which can resist high temperature, have high hardness and abrasion resistance?

Which one of the following alloys contains a non-metal as one of its constituent?

Which of the following alloys has a maximum percentage of Copper?