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1. The SI metric system consists of seven base units, with ____ designating the base unit for mass.
a.
candela
b.
kilogram
c.
meter
d.
mole
ANSWER:
b
2. A millimeter is ____ meter.
a.
one thousandth of a
b.
one hundredth of a
c.
a hundred times a
d.
a thousand times a
ANSWER:
a
3. The unit of work or energy is a ____.
a.
joule
b.
watt
c.
hertz
d.
newton
ANSWER:
a
4. Mechanical forces that can affect materials are measured by the formula, Force = Mass x ____.
a.
height
b.
weight
c.
acceleration
d.
pressure
ANSWER:
c
5. Pressure (stress) is force applied over an area. The metric unit for stress is referred to as the ____.
a.
joule
b.
pascal
c.
newton
d.
hertz
ANSWER:
b
6. Stress usually causes material to deform in length, a change known as ____.
a.
a gravity constant
b.
deformation
c.
strain
d.
strength
ANSWER:
c
7. The ratio between the stress applied and the strain within the linear range of the stress-strain curve is called the ____.
a.
modulus of rupture
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Chapter 06: Properties and Tests of Selected Plastics
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b.
tensile strength
c.
toughness
d.
modulus of elasticity
ANSWER:
d
8. What is the ability of a material to withstand forces pulling it apart called?
a.
tensile strength
b.
modulus of elasticity
c.
toughness
d.
modulus of rupture
ANSWER:
a
9. The value that shows how much force is needed to rupture or crush a material is known as ____.
a.
toughness
b.
tensile strength
c.
compressive strength
d.
modulus of elasticity
ANSWER:
c
10. When calculating compressive strength, the units used are multiples of the ____.
a.
hertz
b.
meter
c.
joule
d.
pascal
ANSWER:
d
11. The measure of how much stress (load) can be applied to a material before it breaks is ____.
a.
tensile strength
b.
flexural strength
c.
compressive strength
d.
shear strength
ANSWER:
b
12. What is the ability to absorb or dissipate vibrations called?
a.
damping
b.
hardness
c.
fatigue
d.
None of the above
ANSWER:
a
13. In comparing relative densities of plastics, which plastic is denser?
a.
ABS
b.
urethanes
c.
fluoroplastics
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Chapter 06: Properties and Tests of Selected Plastics
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d.
polyester
ANSWER:
c
14. When a mass suspended from a test sample causes the sample to change shape over a period of time, the strain is
called ____.
a.
fatigue
b.
stress
c.
tension
d.
creep
ANSWER:
d
15. Which material has the highest viscosity?
a.
molasses
b.
water
c.
kerosene
d.
corn syrup
ANSWER:
a
16. The rate at which heat energy is transferred from one molecule to another is called ____.
a.
deflection temperature
b.
thermal expansion
c.
specific heat
d.
thermal conductivity
ANSWER:
d
17. Which material has the highest thermal conductivity?
a.
aluminum
b.
glass
c.
iron
d.
copper
ANSWER:
a
18. Which plastics material has the highest thermal expansion value?
a.
phenol-formaldehyde
b.
silicones
c.
polyethylene
d.
epoxy
ANSWER:
c
19. The measure of the ability of a material to support combustion is called ____.
a.
self-extinguishment
b.
flammability
c.
melt index
d.
ablative index
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Chapter 06: Properties and Tests of Selected Plastics
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ANSWER:
b
20. Chemical resistance tests of selected plastics shows that ____ is only slightly affected by strong acids.
a.
polyamide
b.
acetal
c.
melamine
d.
acrylic
ANSWER:
c
21. Many weathering tests are conducted in ____, where samples receive considerable exposure to heat, moisture, and
sunlight.
a.
Texas
b.
California
c.
Arizona
d.
Florida
ANSWER:
d
22. The intensity of a color is represented by its ____.
a.
saturation
b.
hue
c.
refraction
d.
lumina
ANSWER:
a
23. Which plastics material is most hygroscopic?
a.
epoxy
b.
polyethylene
c.
polyamide
d.
polycarbonate
ANSWER:
c
24. Strain is measured in millimeters per ____.
a.
centimeter
b.
millimeter
c.
kilogram
d.
gram
ANSWER:
b
25. Young’s modulus is measured by the ratio of stress to____.
a.
strain
b.
mass
c.
strength
d.
acceleration
ANSWER:
a
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Chapter 06: Properties and Tests of Selected Plastics
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