Deck 21: Fibers, Paints, and Other Polymers

Question 1

Paints and fibers contain polymers.

Answer 1

True

Question 2

Materials that have very short repeating molecular units are known as polymers.

Answer 2

False

Question 3

The repeating units in polymers are called monomers.

Answer 3

True

Question 4

Fiber evidence is known for its individual characteristics.

Question 5

A natural wave or twist of a fiber is known as crimp.

Question 6

Natural fibers are usually measured in denier.

Question 7

No amount of testing will individualize a fiber to a particular piece of fabric in the absence of a tear match.

Question 8

The method for measuring the diameter of a fiber depends on its shape.

Question 9

Unlike glass, fibers exhibit no properties of a refractive index.

Question 10

Fibers almost never contain a polymer backbone, but normally do contain one or more dyes or pigments.

Question 11

Once extracted from a fiber, a dye is normally analyzed by thin layer chromatography.

Question 12

Paint chips used as evidence should always be taped to a card.

Question 13

The most important characteristic of paint evidence is color layer sequence.

Question 14

Paints must be pyrolyzed if they are to be chromatographed.

Question 15

Paint smears are easier to analyze than paint chips.

Question 16

The two major methods to analyze the chemical composition of fibers are

A) FTIR, Chromatography
B) Chromatography, PyGC
C) FTIR, PyGC
D) Microscopy, Chromatography

Question 17

The major components of paint are

A) pigments, binders
B) clearcoat, pigments
C) clearcoat, binders
D) none of these

Question 18

The following type of paint dries to a high gloss.

A) enamel
B) lacquer
C) flat latex
D) none of the above

Question 19

The basic types of paints, in regard to use, include

A) automotive
B) structural
C) artistic
D) all of these

Question 20

The majority of cars have ______ coats of paint.

A) three
B) four
C) five
D) six

Question 21

Paint evidence come is the form of

A) chips
B) smears
C) both of these
D) neither of these

Question 22

An example of a homopolymer is

A) nylon
B) polystyrene
C) both of the these
D) neither of these

Question 23

Fibers that come from a plant or animal origin as classified as

A) natural
B) synthetic
C) semi-synthetic
D) chemical

Question 24

Fiber morphology looks at the ______ of the fiber.

A) color
B) weave
C) texture
D) structure

Question 25

Which of the following is not one of the characteristics of fiber morphology are

A) size
B) cross section
C) origin
D) crimp

Question 26

Organic substances in fibers that absorb visible light are called

A) Dyes
B) Pigments
C) both a and b
D) neither a or b

Question 27

Fibers are class evidence, not individual evidence, with the exception of

A) dye matching
B) tear matching
C) crimp matching
D) medulla matching