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WorksheetsUnit 3-Fibers
Total questions: 15
Worksheet time: 8mins
1. Fiber evidence can have probative value.
true
false
2. It is easy to identify synthetic fibers because they have a perfectly round cross section.
true
false
3. A piece of fabric can be individualized to a particular garment
true
false
4. A fiber can be individualized to a particular piece of fabric.
true
false
5. Fibers make up fabrics.
true
false
6. Silk is a synthetic fabric.
true
false
7. The most common type of natural fiber is wool.
true
false
8. The most common type of synthetic fiber is denim.
false
true
9. An investigator can use the way a fabric accepts a particular dye to identify and compare samples.
true
false
10. Optical microscopy is one of the most important methods of fiber identification.
true
false
11. 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 280 gray sweatshirts, the lab found the fiber matched 28 of them. What is the probability that the crime scene fiber and that of the suspect matched simply by chance?
one in 28
one 280
one in 10
cannot be calculated by this information
12. Some examples of natural fibers are:
jute, rayon, silk, and wool
wool, cotten, cashmere
linen, cotton, acetate, rayon
linen, cotton, wool, Dacron
13. Fibers that are polymers are:
natural
synthetic
all fibers are polymers
no fibers are polymers
14. To test the dye in a particular fiber, it can be extracted and then tested using:
a burn test
a thermal decomposition test
chemical test
any of these
15. Linen is classified as a
natural fiber
synthetic fiber
regenerated fiber
animal fiber
