Q1: Which of the following materials has the least scrap value ?

ANS:B - Stainless steel

Stainless steel is a type of steel alloy that contains a minimum of 10.5% chromium by mass. It is known for its exceptional corrosion resistance, which is achieved through the formation of a passive chromium oxide layer on its surface. This oxide layer prevents rusting and staining of the steel, making stainless steel suitable for a wide range of applications where corrosion resistance is required. The chromium content in stainless steel forms a protective oxide layer when exposed to oxygen, which makes it highly resistant to rust and corrosion in various environments, including harsh chemical and marine environments. Additionally, stainless steel alloys may contain other alloying elements such as nickel, molybdenum, and titanium to enhance specific properties such as strength, formability, and resistance to extreme temperatures. Stainless steel is widely used in industries such as construction, architecture, automotive, aerospace, food processing, medical equipment, and household appliances due to its durability, hygiene, and aesthetic appeal. It comes in various grades and finishes to meet specific requirements, and its recyclability makes it an environmentally friendly material choice. Overall, stainless steel is valued for its combination of corrosion resistance, strength, and versatility.