puppo monica

16. From what can natural fibers be harvested?

• Plants, animals, and minerals

• Minerals, Artificial Materials, Fabrics

• Plants, Bacteria, Fungi

• Rocks, Plastics, Metals

17. What gives silk its shiny nature?

• Its color

• Its thickness

• Its natural stiffness

• Its ability to reflect light

18. What characteristic of cotton makes it a great source of fiber for clothing?

• It is naturally waterproof

• The fibers are easily woven and dyed

• It resists wrinkles well

• It is difficult to dye

19. Mineral fibers such as asbestos are very durable. What are some examples where asbestos fibers are used?

• Carpeting, furniture, clothing

• Car seats, office furniture, interior paint

• Building foundations, glass production, shoes

• A, B, C only (Brake liners, shingles, floor tiles)

20. What are some characteristics and properties of synthetic fibers?

• They are all biodegradable

• All of these (formed by combining monomer compounds, man-made, used in carpet fibers)

• They are difficult to produce in a laboratory

• They are naturally sourced

21. What are some observations used to help identify a specific fiber?

• How easily it tears

• The color before it burns

• How soft it feels to touch

• All of the above (smell of burned fiber, coiling/melting, color and structure of residue)

22. Why are fibers an excellent source of trace evidence?

• They cannot be easily transferred

• They are hard to collect and store

• They are very heavy and visible

• All of the above (easily transferred, often overlooked, easily collected)

23. A fiber is collected at a crime scene. What traits indicate it was human hair, not clothing fiber?

• Presence of split ends

• Diameter greater than 1 mm

• Greater elasticity

• Only A and B (cuticle presence, medullary index of 0.33 or less)

24. What features of a wool fiber might you observe under a microscope?

• Straight, glossy surface

• Clear tubular shape

• Flat, smooth structure

• A and B only (cuticle pattern, wiry and fuzzy fibers)

25. From what can fibers be shed, causing fibers to be left at a crime scene?

• Vehicles only

• Doors only

• Windows only

• All of these (carpets, clothing, linen, furniture, insulation, rope)