Q1: Austenite is not

ANS:C - magnetic

Austenite is not magnetic. Austenite is a solid solution phase of iron and carbon that exists at high temperatures, typically above 723°C (1333°F). It is non-magnetic in its pure form and exhibits face-centered cubic (FCC) crystal structure. Austenite is stable at elevated temperatures and is characterized by its high ductility and malleability. It is commonly found in stainless steels and certain types of tool steels after undergoing appropriate heat treatment processes. While austenite is ductile, malleable, and soft at high temperatures, it does not exhibit magnetic properties. This distinguishes it from other phases of iron and steel, such as ferrite and martensite, which can be magnetic under certain conditions.