21. What is the term used to describe the process of transforming iron ore into iron in a blast furnace?
a) Smelting
b) Refining
c) Alloying
d) Galvanizing
22. Which of the following is a common method of steel forming that involves bending and shaping steel sheets or plates?
a) Hot rolling
b) Cold rolling
c) Pressing
d) Extrusion
23. What is the term used to describe the process of coating steel with a layer of zinc to prevent corrosion?
a) Galvanization
b) Oxidation
c) Rusting
d) Passivation
24. Which of the following is a common application of high-strength steel?
a) Automotive manufacturing
b) Cutlery and kitchenware
c) Shipbuilding
d) Construction
25. What is the term used to describe the process of cooling hot steel rapidly to increase its hardness?
a) Tempering
b) Annealing
c) Quenching
d) Normalizing
