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.
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
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, 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
List at least four examples of synthetic fibers - ✔✔Nylon, polyester, acrylic, plastic
What is a polymer? - ✔✔A molecule consisting of many repeating units. Can be
naturally occurring or synthetic
Are all fibers polymers or only some? - ✔✔all
What types of tests are used to test the dye in a particular fiber? - ✔✔Chemical tests or
chromotagraphy
Is linen a natural or synthetic fiber? - ✔✔natural
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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.
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
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, 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
List at least four examples of synthetic fibers - ✔✔Nylon, polyester, acrylic, plastic
What is a polymer? - ✔✔A molecule consisting of many repeating units. Can be
naturally occurring or synthetic
Are all fibers polymers or only some? - ✔✔all
What types of tests are used to test the dye in a particular fiber? - ✔✔Chemical tests or
chromotagraphy
Is linen a natural or synthetic fiber? - ✔✔natural
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