WorksheetsBertino Forensic Science Chapter 4: Fiber
Total questions: 25
Worksheet time: 16mins
The most common type of regenerated fiber, which is derived from cellulose and is mostly plant in origin, is rayon.
True
False
Synthetic polymer fibers, which all originate with petroleum products, are cellulose-based fibers.
True
False
Polyester has properties similar to nylon except it is easily broken down by light and concentrated acid.
True
False
A disadvantage of manufactured fibers is that they can deteriorate in bright sunlight and melt at a lower temperature than natural fibers.
True
False
Fibers are woven into textiles or fabrics.
True
False
Fibers that have been spun together are called
a mineral fiber.
a textile.
a fiber.
a yarn
A small molecule that may bond to other monomers to become a polymer is a:
monomer.
polymer.
fiber.
None of these choices.
When fibers are transferred directly from victim to suspect or suspect to victim, this is called:
necessary transfer.
absolute transfer.
direct transfer.
None of these choices.
The transfer of evidence such as a fiber from a source to a person, then to another person, is called:
primary transfer.
secondary transfer.
tertiary transfer.
direct transfer.
Early collection of fibers in an investigation is critical. Within 24 hours, an estimated ____ percent of all fibers may have fallen from a victim or been lost from a crime scene.
65
75
85
95
A forensic scientist will ask questions about:
type of fiber.
number of fibers found.
textile from which fiber originated.
fiber color.
where the fiber was found.
Fiber evidence is gathered with:
vacuums
forceps
lint roller
glue
tape
Two methods that can analyze fibers without damaging them are:
polarizing light microscopy and infrared spectroscopy.
polarizing light spectroscopy and infrared microscopy.
heat and light.
None of these choices.
Fibers are classified as either:
natural fibers or synthetic fibers.
acrylic fibers or plant fibers.
polymers or synthetic fibers.
olefins or synthetic fibers.
Natural fibers come from:
plants.
animals.
minerals that are mined from the ground.
All of these choices.
Natural plant fibers are produced from:
seeds.
fruits.
stems and leaves.
All of the these choices.
All plant fibers share the common polymer that is:
cellulose.
sulfuric acid.
protein.
None of these choices.
One seed fiber is:
cotton.
hemp.
coir.
jute.
Fiberglass is a fiber form of:
proteins.
cellulose.
glass.
polymers.
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:
fruit fibers and polymers.
stem fibers and polymers.
regenerated fibers and polymers.
seed fibers and polymers.
Weave patterns have names like tabby, twill and (a) .
The simplest weave pattern is the plain, or (a) , weave
The number of threads that are packed together for any given amount of fabric is known as _______ ________.
(a)
Manila is a fiber extracted from the leaves of (a) , a relative of the banana tree.
Flax is the most common stem fiber, and is most commonly found in the textile, (a) .
