Chapter 4 - Fibers Review

Fibers that have been spun together are called:

• a textile

• yarn

• a mineral fiber

• a fiber

A small molecule that may bond to other monomers to become a polymer is a:

• monomer

• polymer

• fiber

When fibers are transferred directly from victim to suspect or suspect to victim, this is called:

• necessary transfer

• direct transfer

• absolute transfer

• secondary transfer

The transfer of evidence such as a fiber from a source to a person, then to another person, is called:

• primary transfer

• tertiary transfer

• secondary transfer

• direct transfer

Early collection of fibers in an investigation is critical. Within 24 hours, an estimated _________ of all fibers may have fallen from a victim or been lost from a crime scene.

• 75%

• 85%

• 95%

A forensic scientist will ask questions about

• type of fiber

• fiber color

• number of fibers found

• all of these choices

Fiber evidence is gathered with:

• special vacuums

• tweezers

• sticky tape

• all of these choices

Two methods that can analyze fibers without damaging them are:

• polarizing light microscopy and infrared microscopy

• polarizing light microscopy and infrared spectroscopy

• heat and light

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:

• animals

• plants

• minerals that are mined from the ground

• all of these choices