Deck 2: The Nature of Materials

Question 1

The basic structural unit of matter is which one of the following:

A)atom
B)electron
C)element
D)molecule
E)nucleus

Answer 1

atom

Question 2

Approximately how many different elements have been identified (one best answer):

A)10
B)50
C)100
D)200
E)500

Answer 2

100

Question 3

In the Periodic Table, the elements can be divided into which of the following categories (three best answers):

A)ceramics
B)gases
C)liquids
D)metals
E)nonmetals
F)polymers
G)Semi-metals
H)solids

Answer 3

metals
nonmetals
Semi-metals

Question 4

The element with the lowest density and smallest atomic weight is which one of the following:

A)aluminum
B)argon
C)helium
D)hydrogen
E)magnesium

Question 5

Which of the following bond types are classified as primary bonds (three correct answers):

A)covalent bonding
B)hydrogen bonding
C)ionic bonding
D)metallic bonding
E)van der Waals forces

Question 6

How many atoms are there in the body-centered cubic (BCC) unit cell (one correct answer):

A)8
B)9
C)10
D)12
E)14
F)17

Question 7

How many atoms are there in the face-centered cubic (FCC) unit cell (one correct answer):

A)8
B)9
C)10
D)12
E)14
F)17

Question 8

How many atoms are there in the hexagonal close-packed (HCP) unit cell (one correct answer):

A)8
B)9
C)10
D)12
E)14
F)17

Question 9

Which of the following are point defects in a crystal lattice structure (three correct answers):

A)edge dislocation
B)grain boundaries
C)interstitialcy
D)Schottky defect
E)screw dislocation
F)Vacancy

Question 10

Which one of the following crystal structures has the fewest slip directions and therefore the metals with this structure are generally more difficult to deform at room temperature:

A)BCC
B)FCC
C)HCP

Question 11

Grain boundaries are an example of which one of the following types of crystal structure defects:

A)dislocation
B)Frenkel defect
C)line defects
D)point defects
E)surface defects

Question 12

Twinning is which of the following (three best answers):

A)elastic deformation
B)mechanism of plastic deformation
C)more likely at high deformation rates
D)more likely in metals with HCP structure
E)slip mechanism
F)type of dislocation

Question 13

Metals are characterized by which one of the following bonding types:

A)adhesive
B)covalent
C)hydrogen
D)ionic
E)metallic
F)van der Waals

Question 14

Ceramics are characterized by which two of the following bonding types:

A)adhesive
B)covalent
C)hydrogen
D)ionic
E)metallic
F)van der Waals

Question 15

Polymers are characterized by which two of the following bonding types:

A)adhesive
B)covalent
C)hydrogen
D)ionic
E)metallic
F)van der Waals

Question 16

In general, metals are characterized by which of the following properties (three best answers):

A)brittleness
B)chemical inertness
C)electrically insulating
D)high electrical conductivity
E)high hardness
F)high thermal conductivity
G)low density
H)low thermal conductivity

Question 17

In general, ceramics are characterized by which of the following properties (four best answers):

A)brittleness
B)chemical inertness
C)electrically insulating
D)high electrical conductivity
E)high hardness
F)high thermal conductivity
G)low density
H)low thermal conductivity

Question 18

In general, polymers are characterized by which of the following properties (three best answers):

A)brittleness
B)chemical inertness
C)electrically insulating
D)high electrical conductivity
E)high hardness
F)high thermal conductivity
G)low density
H)low thermal conductivity