Forensics chapter 4 Test

Weave patterns have names like tabby, twill and __________________.

Satin

Fibers have been spun together are called a. a textile b. yarn c. a mineral fiber d. a fiber

b. yarn

Natural fibers come from: a. animals b. plants c. minerals that are mined from the ground d. All of these choices

d. All of these choices

A disadvantage of manufactured fibers is that they can deteriorate in bright sunlight and melt at a lower temperature than natural fibers a. True b. False

a. True

Fibers are woven into textiles or fabrics. a. True b. False

a. True

All plant fibers share the common polymer that is a. cellulose b. protein c. sulfuric acid d. None of these choices

a. cellulose

One seed fiber is: a. cotton b. coir c. hemp d. jute

a. cotton

A small molecule that may bond to other monomers to become a polymer is a: a. monomer v. polymer c. fiber d. None of these choices

a. monomer

Fibers are classified as either a. natural fibers or synthetic fibers b. polymers or synthetic fibers c. acrylic fibers or plant fibers d. olefins or synthetic fibers

a. natural fibers or synthetic fibers

Two methods that can analyze fibers without damaging them are: a. polarizing light microscopy and infrared spectroscopy b. polarizing light spectroscopy and infrared microscopy c. heat and light d. none of these choices

a. polarizing light microscopy and infrared spectroscopy

The most common type of regenerate fiber, which is derived from cellulose is mostly plant in origin, is rayon. a. True b. False

a. true

Polyester has properties similar to nylon except it is easily broken down by light and concentrated acid. a. true b. False

b. False

Synthetic polymer fibers, which all originate with petroleum products are cellulose-based fibers. a. True b. False

b. False

Fiberglass is a fiber form of a. proteins b. glass c. cellulose d. polymers

b. glass

Until the nineteenth century, only plant or animal fibers were used to make clothing and textiles. Half the fibers produced today are synthetic. They are categorized as a. fruit and fibers and polymers b. regenerated fibers and polymers c, stem fibers and polymers d. seed fibers and polymers

b. regenerated fibers and polymers

Early collection of fibers is an investigation is critical. Within 24 hours, an estimated: a. 75% of all fibers may be fallen from a victim or been lost from a crime scene b. 85% of all fibers may be fallen from a victim or been lost from a crime scene c. 95% of all fibers may be fallen from a victim or been lost from a crime scene d.None of these choices

c. 95% of all fibers may be fallen from a victim or been lost from a crime scene

The transfer of evidence such as a fiber from a source to a person, then to another person, is called: a, primary transfer b. tertiary transfer c. secondary transfer d. direct transfer

c. secondary transfer

natural plant fibers are produced from a. seeds b. fruits c. stems and leaves d. All of these choices

d. All of these choices

When fibers are transferred directly from victim to suspect or suspect to victim, this is called a. primary transfer b. tertiary transfer c. secondary transfer d. direct transfer

d. direct transfer

A forensic scientist will ask questions about a. type of fiber b. fiber color c. number of fibers found d. textile from which fiber originated e. fiber color f. where the fiber was found g. All of these choices

g. All of these choices

Fiber evidence is gathered with a. vacums b. tape c. forceps d. glue e. lint roller f. a,b,d,e g. a,b,c,e h. All of these choices

h. All of these choices

The number of threads that are packed together for any given amount of fabric is known as _____________

thread count