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1. The breaking of chemical bonds by ____ is the cause for degradation of plastics.
a.
pyrolysis
b.
oxidation
c.
hydrolysis
d.
destabilization
ANSWER:
b
2. An important primary antioxidant is ____.
a.
polyethylene
b.
thioester
c.
phosphite
d.
phenolic
ANSWER:
d
3. The best choice for coloring a totally transparent product is a(n) ____.
a.
dye
b.
organic pigment
c.
inorganic pigment
d.
special-effect pigment
ANSWER:
a
4. Which coloring additive provides the most brilliant opaque color?
a.
inorganic pigments
b.
dyes
c.
organic pigments
d.
special-effect pigments
ANSWER:
c
5. When chemical, electrical, or light energy excites electrons, the radiation of light is called ____.
a.
phosphorescence
b.
luminescence
c.
iridescence
d.
fluorescence
ANSWER:
b
6. In 1977, tris-BP (tris(2, 3, dibromopropyl) phosphate), which was used as a flame retardant in sleepwear for children,
was found to cause mutations and was listed as a probable _____.
a.
human reproductive toxicant
b.
neurotoxicant
c.
carcinogen
d.
renal toxicant
ANSWER:
c
7. Foaming agents are used widely in the manufacture of ____.
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a.
rigid dashboards
b.
skylights
c.
tool dies
d.
seat cushions
ANSWER:
d
8. What are additives that retard the decomposition of a polymer caused by heat, light energy, oxidation, or mechanical
shear called?
a.
heat stabilizers
b.
catalysts
c.
blowing agents
d.
char barriers
ANSWER:
a
9. Which plastics product has poor thermal stability and has been the focus of most heat stabilizers?
a.
ABS
b.
epoxy
c.
PVC
d.
polypropylene
ANSWER:
c
10. In the past, heat stabilizers were compounds based on ____ and cadmium but these metals posed environmental and
health concerns.
a.
silver
b.
nickel
c.
mercury
d.
lead
ANSWER:
d
11. Lubricants in plastics production are used for reducing friction and ____.
a.
adding tensile strength
b.
aiding emulsification
c.
reducing heat
d.
adding flexibility
ANSWER:
b
12. Why are nucleating agents added to a polymer?
a.
to increase its crystallinity
b.
to reduce acidity
c.
to improve flexibility
d.
to lower its melting point
ANSWER:
a
13. Plasticizer leaching or loss is an important consideration in terms of ____.
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a.
increasing opacity
b.
resistance to insects
c.
contact with food
d.
compatibility with resins
ANSWER:
c
14. Ingredients that are added to resins and polymers to improve physical properties of the composite are most accurately
known as ____.
a.
lubricants
b.
plasticizers
c.
additives
d.
reinforcements
ANSWER:
d
15. Reinforcements that consist of unidirectional fibers are called ____.
a.
lamina
b.
thermoplastic
c.
fibrous
d.
interfacing
ANSWER:
a
16. One of the most important reinforcing materials is _____ which has allowed many parts previously made from metals
have been replaced with plastics.
a.
carbonaceous materials
b.
polymer fibers
c.
inorganic fibers
d.
fibrous glass
ANSWER:
d
17. When a filler is submicron in size, it is termed ____.
a.
a nanocomposite
b.
isotropic
c.
inert
d.
anisotropic
ANSWER:
a
18. Interior automotive parts require ____ to provide resistance to high temperatures and intense sunlight.
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a.
flame retardants
b.
heat stabilizers
c.
antioxidants
d.
plasticizers
ANSWER:
c
19. This figure shows that ____ arrangement of fibers provides the highest strength.
a.
pseudo-isotropic
b.
bidirectional
c.
random
d.
anisotropic
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ANSWER:
d
20. This figure shows ____, a type of glass used for reinforcement.
a.
rovings
b.
chopped fibers
c.
yarns
d.
twisted rovings
ANSWER:
b