Question 1

For a given substance that exhibits liquid- crystalline properties, the transition from solid to liquid- crystal state occurs .

Accepted Answer

A)   over a range of temperatures between the melting point of the solid and the boiling point of the liquid
B)   at a well defined temperature above the melting point of the solid
C)   at a well defined temperature below the melting point of the solid
D)   at the melting point of the solid
E)   over a range of temperatures that includes the melting point of the solid

Question 2

There are different amino acids present in most proteins.

Accepted Answer

A)   1
B)   2
C)   99
D)   16
E)   20

Question 3

Superconductivity means that .

Accepted Answer

A)   electrons move faster
B)   electrons move through a shorter path
C)   electrons move without resistance
D)   super expensive materials were used
E)   diamagnetic atoms become elongated

Question 4

In the smectic A liquid- crystalline phase, _ .

Accepted Answer

A)   the molecules are oriented in a totally random fashion
B)   the molecules are aligned with their long axes tilted with respect to a line perpendicular to the plane in which the molecules are stacked
C)   disk- shaped molecules are aligned through a stacking of the disks in layers
D)   the molecules are aligned along their long axes, with no ordering with respect to the ends of the molecules
E)   the molecules are arranged in sheets, with their long axes parallel and their ends aligned as well

Question 5

A _ _ liquid crystal has the least order and is the most liquid- like.

Accepted Answer

A)   smectic B
B)   cholesteric
C)   nematic
D)   smectic C
E)   smectic

Question 6

Cholesteric liquid crystals are colored because .

Accepted Answer

A)   of the slight twist between layers
B)   All of the molecules contain multiple benzene rings.
C)   of the large spacing between layers
D)   each molecule is a chromophore
E)   of the large number of conjugated bonds

Question 7

Nylon is formed by the reaction of a with a .

Accepted Answer

diamine, diacid

Question 8

The formation of a condensation polymer generally involves _ .

Accepted Answer

A)   the addition of a plasticizer
B)   the formation of significant crosslinking
C)   the elimination of a small molecule
D)   the mixing of sulfur with an addition polymer
E)   the vaporization of a plasticizer

Question 9

A biomaterial intended for use as a long- term replacement of a bone must .

Accepted Answer

A)   have sufficient rigidity
B)   be chemically inert
C)   possess all of these qualities
D)   not degrade over time
E)   not cause an immune response

Question 10

MRI stands for .

Accepted Answer

A)   Magnetic Resonance Imaging
B)   Meissner Resonance Inductance
C)   Material Research Instrument
D)   Material Resistive Impedance
E)   Me Really Imaginative A

Question 11

For a given substance that exhibits liquid- crystalline properties, the liquid- crystalline state exists
)

Accepted Answer

A)   in a range of temperatures above the melting point of the solid
B)   in a range of temperatures from below the melting point to above the melting point
C)   at one particular temperature below the melting point of the solid
D)   in a range of temperatures below the melting point of the solid
E)   at one particular temperature above the melting point of the solid

Question 12

Cholesteric liquid crystals have not been used for monitoring of .

Accepted Answer

A)   skin temperature
B)   all of the above
C)   hot spots in microelectronic circuits
D)   temperature of light
E)   temperature of cookware

Question 13

In the context of biopolymers, the opposite of the polymerization process is .

Accepted Answer

A)   addition
B)   condensation
C)   cross- linking
D)   hydrolysis
E)   sublimation

Question 14

A category plastic container will generally be the most easily recycled.

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   22

Question 15

Materials that eventually break down in the body .

Accepted Answer

A)   are always toxic
B)   cannot be used as biomaterials
C)   can be used to construct "scaffoldings" on which natural cells grow
D)   can be used to construct bone- replacements
E)   can be used to construct long- term replacements for heart valves

Question 16

The process of adding controlled amounts of impurity atoms to a material is known as
.

Accepted Answer

The answer of The process of adding controlled amounts of...

Question 17

Advantages to replacement of metal parts used in high- temperature applications with ceramics include:
1)  Ceramics are easily manufactured free of defects.
2)  Ceramics are less dense than metals.
3)  Ceramics are less brittle than metals.
4)  Ceramics are more resistant to corrosion than metals.

Accepted Answer

A)   2, 3, 4
B)   1, 2, 4
C)   2, 4
D)   1, 2, 3, 4
E)   1, 3, 4

Question 18

A plasticizer makes a polymer more pliable by reducing the interactions between polymer chains.

Accepted Answer

A) True 
 B)False

Question 19

The empirical formula of an addition polymer .

Accepted Answer

A)   is the same as that of the monomer from which it is formed except that 2 H and 1 C have been added
B)   is the same as that of the monomer from which it is formed except that 2 H and 1 O have been subtracted
C)   is the same as that of the monomer from which it is formed except that 2 H and 1 C have been subtracted
D)   is the same as that of the monomer from which it is formed
E)   is the same as that of the monomer from which it is formed except that 2 H and 1 O have been added

Question 20

Polyethylene is formed by a condensation reaction.

Accepted Answer

A) True 
 B)False  False

Exam 12: Modern Materials

For a given substance that exhibits liquid- crystalline properties, the transition from solid to liquid- crystal state occurs .

Correct AnswerverifiedShow Answer

There are different amino acids present in most proteins.

Correct AnswerverifiedShow Answer

Superconductivity means that .

Correct AnswerverifiedShow Answer

In the smectic A liquid- crystalline phase, _ .

Correct AnswerverifiedShow Answer

A _ _ liquid crystal has the least order and is the most liquid- like.

Correct AnswerverifiedShow Answer

Cholesteric liquid crystals are colored because .

Correct AnswerverifiedShow Answer

Nylon is formed by the reaction of a with a .

Correct Answerverifieddiamine, diacid

The formation of a condensation polymer generally involves _ .

Correct AnswerverifiedShow Answer

A biomaterial intended for use as a long- term replacement of a bone must .

Correct AnswerverifiedShow Answer

MRI stands for .

Correct AnswerverifiedA

For a given substance that exhibits liquid- crystalline properties, the liquid- crystalline state exists )

Correct AnswerverifiedShow Answer

Cholesteric liquid crystals have not been used for monitoring of .

Correct AnswerverifiedShow Answer

In the context of biopolymers, the opposite of the polymerization process is .

Correct AnswerverifiedShow Answer

A category plastic container will generally be the most easily recycled.

Correct AnswerverifiedShow Answer

Materials that eventually break down in the body .

Correct AnswerverifiedShow Answer

The process of adding controlled amounts of impurity atoms to a material is known as .

Correct AnswerverifiedShow Answer

Advantages to replacement of metal parts used in high- temperature applications with ceramics include: 1) Ceramics are easily manufactured free of defects. 2) Ceramics are less dense than metals. 3) Ceramics are less brittle than metals. 4) Ceramics are more resistant to corrosion than metals.

Correct AnswerverifiedShow Answer

A plasticizer makes a polymer more pliable by reducing the interactions between polymer chains.

Correct AnswerverifiedShow Answer

The empirical formula of an addition polymer .

Correct AnswerverifiedShow Answer

Polyethylene is formed by a condensation reaction.

Correct AnswerverifiedFalse

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diamine, diacid

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A

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