Test: Fibers Chapter 6 Exam Questions and
Answers 100% Pass
Can fiber evidence have probative value? - ✔✔yes
What characteristics are indicative of synthetic fibers? - ✔✔Uniform shape
of the cross section (can be different shapes), stronger and more chemically
inert
Can a piece of fabric be individualized to a particular garment? - ✔✔Yes
for a piece of fabric, no for an individual fiber. Fabric - yes if it can be
proven that the fabric fits into a torn area of the garment. Fiber - no, as
fibers are class evidence. They have probative value, but are still class
evidence.
What is the difference between a fabric and a fiber? - ✔✔Fabric is made
from fibers. Fibers are made of twisted elements that are either natural or
artificial.
1
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, Is silk a synthetic or natural fiber? - ✔✔natural
What is the most common type of natural fiber? - ✔✔cotton
What is the most common type of synthetic fiber? - ✔✔nylon
Can an investigator use the way a fabric accepts a specific dye to identify &
compare samples? - ✔✔yes
What is optical microscopy? - ✔✔The most important method of fiber
identification that involves polarizing light and comparison microscopes.
What is an electropherogram? - ✔✔plot of results from an analysis done by
electrophoresis.
A gray cotton fiber was found on the red sweater of a victim. A gray cotton
fiber was taken from a suspect's sweatshirt. After testing 900 gray
sweatshirts, the lab found the fiber matches 45 of them. What is the
probability that the crime scene fiber and that of the suspect matched
simply by chance? (Show your work) - ✔✔45/900 = 1/20 (0.05)
List at least four examples of natural fibers. - ✔✔Cotton, wool, linen, silk
2
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Answers 100% Pass
Can fiber evidence have probative value? - ✔✔yes
What characteristics are indicative of synthetic fibers? - ✔✔Uniform shape
of the cross section (can be different shapes), stronger and more chemically
inert
Can a piece of fabric be individualized to a particular garment? - ✔✔Yes
for a piece of fabric, no for an individual fiber. Fabric - yes if it can be
proven that the fabric fits into a torn area of the garment. Fiber - no, as
fibers are class evidence. They have probative value, but are still class
evidence.
What is the difference between a fabric and a fiber? - ✔✔Fabric is made
from fibers. Fibers are made of twisted elements that are either natural or
artificial.
1
100% Pass Guarantee Katelyn Whitman, All Rights
, Is silk a synthetic or natural fiber? - ✔✔natural
What is the most common type of natural fiber? - ✔✔cotton
What is the most common type of synthetic fiber? - ✔✔nylon
Can an investigator use the way a fabric accepts a specific dye to identify &
compare samples? - ✔✔yes
What is optical microscopy? - ✔✔The most important method of fiber
identification that involves polarizing light and comparison microscopes.
What is an electropherogram? - ✔✔plot of results from an analysis done by
electrophoresis.
A gray cotton fiber was found on the red sweater of a victim. A gray cotton
fiber was taken from a suspect's sweatshirt. After testing 900 gray
sweatshirts, the lab found the fiber matches 45 of them. What is the
probability that the crime scene fiber and that of the suspect matched
simply by chance? (Show your work) - ✔✔45/900 = 1/20 (0.05)
List at least four examples of natural fibers. - ✔✔Cotton, wool, linen, silk
2
100% Pass Guarantee Katelyn Whitman, All Rights
