Metals

Which metal has low melting point at 660 C?

• Iron

• Titanium

• Aluminum

• Magnesium

_ is the basic element of steel.

(a)  

Metal is a _ material because of its regular structure.

(a)  

This is an _ material since the atoms are arranged randomly.

(a)  

What is the atomic packing factor for FCC crystal stcucture?

• 64

• 68

• 74

• 78

What does low atomic packing factor mean?

• Low density, more spaces between atoms

• Low density, less spaces between atoms

• High density, more spaces between atoms

• High density, less spaces between atoms

State one type of defects in lattices.

'entire block of atom is shifted out of alignment' Which of the following term refers to this description?

• edge dislocation

• screw dislocation

• interstitial defect

• substitutional defect

Breaking and re-forming of atomic bonds is the underlying mechanism of _ deformations.

(a)  

Which of the following deformations is reversible?

• plastic deformation

• elastic deformation

• both plastic and elastic deformations

• none