What is the smallest repeating structure in a crystal?

• Atom

• Grain

• Unit Cell

• Lattice

Which metal has BCC structure at room temperature?

• Aluminum

• Copper

• Iron

• Silver

What is the coordination number of FCC?

• 6

• 8

• 10

• 12

Which microscope uses visible light for observation?

• SEM

• TEM

• Optical microscope

• X-ray microscope

What is the unit of Brinell Hardness Number (BHN)?

• N/mm²

• Kgf/mm²

• No unit

• mm

What is a phase in the context of engineering materials?

• A mixture of gases

• A region with uniform physical and chemical characteristics

• A type of alloy

• A non-metallic compound

What is the primary element in ferrous alloys?

• Copper

• Aluminum

• Iron

• Zinc

Why is FCC more ductile than BCC?

• Fewer atoms

• Higher packing efficiency

• Lower density

• Higher melting point

What does the term 'space lattice' refer to?

• Shape of grain boundaries

• 3D arrangement of unit cells

• Atomic weight

• Crystal defects

What is the function of etching in metallography?

• Clean the surface

• Cut the sample

• Reveal microstructure

• Melt the sample