Deck 4: A Study of Fibers and Textiles

Question 1

The most common type of regenerated fiber, which is derived from cellulose and is mostly plant in origin, is rayon.

Answer 1

True

Question 2

Polyester has properties similar to nylon except it is easily broken down by light and concentrated acid.

Answer 2

False

Question 3

Fibers are woven into textiles or fabrics.

Answer 3

True

Question 4

Early collection of fibers in an investigation is critical.Within 24 hours, an estimated:

A)75% of all fibers may have fallen from a victim or been lost from a crime scene.
B)85% of all fibers may have fallen from a victim or been lost from a crime scene.
C)95% of all fibers may have fallen from a victim or been lost from a crime scene.
D)None of these choices.

Question 5

A disadvantage of manufactured fibers is that they can deteriorate in bright sunlight and melt at a lower temperature than natural fibers.

Question 6

A small molecule that may bond to other monomers to become a polymer is a:

A)monomer.
B)polymer.
C)fiber.
D)None of these choices.

Question 7

Synthetic polymer fibers, which all originate with petroleum products, are cellulose-based fibers.

Question 8

Fibers are classified as either:

A)natural fibers or synthetic fibers.
B)polymers or synthetic fibers.
C)acrylic fibers or plant fibers.
D)olefins or synthetic fibers.

Question 9

All plant fibers share the common polymer that is:

A)cellulose.
B)protein.
C)sulfuric acid.
D)None of these choices.

Question 10

Natural fibers come from:

A)animals.
B)plants.
C)minerals that are mined from the ground.
D)All of these choices.

Question 11

Weave patterns have names like tabby, twill and __________________.

Question 12

When fibers are transferred directly from victim to suspect or suspect to victim, this is called:

A)necessary transfer.
B)direct transfer.
C)absolute transfer.
D)None of these choices.

Question 13

Fibers that have been spun together are called:

A)a textile.
B)yarn.
C)a mineral fiber.
D)a fiber.

Question 14

The simplest weave pattern is the plain, or _______________________, weave.

Question 15

The transfer of evidence such as a fiber from a source to a person, then to another person, is called:

A)primary transfer.
B)tertiary transfer.
C)secondary transfer.
D)direct transfer.

Question 16

Two methods that can analyze fibers without damaging them are:

A)polarizing light microscopy and infrared spectroscopy.
B)polarizing light spectroscopy and infrared microscopy.
C)heat and light.
D)None of these choices.

Question 17

Natural plant fibers are produced from:

A)seeds.
B)fruits.
C)stems and leaves.
D)All of these choices.

Question 18

Until the nineteenth century, only plant or animal fibers were used to make clothing and textiles.Half the fibers produced today are synthetic.They are categorized as:

A)fruit fibers and polymers
B)regenerated fibers and polymers.
C)stem fibers and polymers.
D)seed fibers and polymers.

Question 19

One seed fiber is:

A)cotton.
B)coir.
C)hemp.
D)jute.

Question 20

Fiberglass is a fiber form of:

A)proteins.
B)glass.
C)cellulose.
D)polymers.

Question 21

The number of threads that are packed together for any given amount of fabric is known as _________________________________.

Question 22

Manila is a fiber extracted from the leaves of _______________________, a relative of the banana tree.

Question 23

Flax is the most common stem fiber, and is most commonly found in the textile, _________________________.