Monel metal is an alloy composed mainly of __________.

Correct Answer: Option A — nickel and copper

Monel is a high-strength, corrosion-resistant alloy consisting primarily of nickel (approximately 65-70%) and copper (approximately 20-30%), with small amounts of iron and manganese. Its superior resistance to seawater and steam makes it a standard material for marine pump shafts, valve trim, and various high-stress, corrosive-environment components.