Materials Final Review Summer

Materials Final Review (TESTS I, II, & III)
Part I : Multiple Choice

1) As the temperature of a polymer increases, its density
a. Increases
b. Decreases
c. Remains fairly constant

2) Which one of the three polymer types does not involve cross-linking:
a. Elastomers
b. Thermoplastics
c. Thermosets

3) Degree of polymerization is which of the following:
a. Average number of mers in the molecule chain
b. Proportion of the monomer that has been polymerized
c. Sum of the molecule weights of the mers in the molecule
d. None of the above

4) A branched molecular structure is stronger in the solid state and more viscous in the molten state than a linear structure for the same polymer
a. True
b. False

5) Copolymers are best described by which one of the following
a. Mixtures of two different polymer types
b. Polymers consisting of a mixture of crystallized and amorphous phases
c. Polymers whose molecules are made of repeating units of two different types
d. Two parallel linear polymer chains that are cross-linked

6) As the degree of crystallinity in a given polymer increases, the polymer becomes denser and stiffer, and its melting temperature decreases:
a. True
b. False

7) As the temperature of a polymer increases, its density:
a. Increases
b. Decreases
c. Remains fairly constant

8) How many atoms are there in the BCC unit cell
a. 8
b. 9
c. 10
d. 12
e. 14
f. 17

9) How many atoms are there in the FCC unit cell:
a. 8
b. 9
c. 10
d. 12
e. 14
f. 17

10) How many atoms are there in the HCP unit cell:
a. 8
b. 9
c. 10
d. 12
e. 14
f. 17

11) 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

12) 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

13) Polymers are characterized by which two of the following bonding types:
a. Adhesive
b. Covalent