Which metals are less ductile at room temperature?

• Aluminium, copper, gold

• Zinc, magnesium, cadmium

• Chromium, tungsten, steel

• Beryllium, titanium

Which structure has less slip planes and thus less ductility than FCC?

• Body-centred cubic (BCC)

• Face-centred cubic (FCC)

• Close-packed hexagonal (CPH)

• Simple cubic

What is the main feature of the close-packed hexagonal (CPH) structure?

• Open structure with 2 atoms per lattice

• More dense structure with 4 atoms per lattice

• Close packed structure with 6 atoms per lattice

• Simple cubic structure

Which structure is less dense and has more resistance to slip?

• Face-centred cubic (FCC)

• Body-centred cubic (BCC)

• Close-packed hexagonal (CPH)

• Simple cubic

What is the initial state of metal before solidification begins?

• Solid

• Liquid

• Gas

• Plasma

What are dendrites in the context of metal solidification?

• Crystals that dissolve

• Structures that grow from nucleations

• Bubbles formed in liquid

• Impurities in metal

Where do columnar grains typically grow?

• Towards the hot center

• Towards the cold edges

• Randomly throughout the metal

• At the surface

Where do planes of weakness occur in solidified metal?

• At the surface

• Where columnar grains meet

• In the center

• At the edges

What does the term "plastic deformation" refer to?

• Temporary shape change

• Permanent shape change

• No shape change

• Elastic shape change

What does waste reuse involve?

• Disposing of products

• Using a product only once

• Using a product more than once

• Increasing waste