Chapter 4 Test Study of Fibers and Fabrics

Last updated over 4 years ago

30 questions

2

8

2

10

Library

Chapter 4 Test Study of Fibers and Fabrics

Last updated over 4 years ago

30 questions

2

Fibers are used in forensic science to create a link between crime and ____________________.

2

Very small fibers are classified as __________ evidence.

8

2

Why is it important to find multiple fibers?

2

_______________ transfer– victim to suspect or suspect to victim directly.

2

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

2

The most common form of fiber transfer to be encountered at a crime scene is _______________ of a textile.

2

At times, most fibers recovered from a victim are found in the victim's ____________________.

2

Natural fibers come from animals, plants, and ________________ that are mined from the ground.

2

Using the fiber burn analysis key, if a fiber does not smell like hair and it ceases to burn then it is _________________.

2

Mohair is hair from __________ (animal).

2

Celenese is cellulose chemically combined with ______________.

2

_____________________ has surface scales, hollow or partial hollow core and fibers up to 3 inches long.

2

What type of weave pattern is pictured?

2

What type of weave pattern is pictured?

10

Essay: Write the answer to one essay question in the space provided below.

FCA’s 1. Write in complete sentences and paragraph form.
2. Use Chapter 4 terminology to answer questions(example: fabric, twill, etc...).
3. Provide inferences, other thoughts, or personal experiences in your answer whenever possible.

A) A fiber is found on the victim, explain why this evidence alone is not enough to convict a suspect.

B) Choose a weave pattern, explain how the pattern is created and strengths/weaknesses of the weave.

Fibers are used in forensic science to create a link between crime and ____________________.

Very small fibers are classified as __________ evidence.

manufacturing machine
Point of origin
color of hair
Type of fiber
Possibility of violence
Location of suspects
length of fibers
color

Fiber evaluation can show
Fiber evaluation cannot show

Which of these is an example of circumstantial evidence?

victim recording

videotape footage

carpet fibers

eyewitness testimony

Why is it important to find multiple fibers?

_______________ transfer– victim to suspect or suspect to victim directly.

The most common type of regenerated fiber, which is derived from celulose and is mostly plant in origin, is rayon.

True

False

Synthetic polymer fibers, which all originate with petroleum products, are cellulose-based fibers.

True

False

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

True

False

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

True

False

Fibers are woven into textiles or fabrics.

True

False

Fibers that have been spun together are called:

a textile.

yarn.

a mineral fiber.

a fiber.

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.

Fiber evidence is gathered with:

special vacuums.

sticky tape.

tweezers.

all of these choices.

Two methods that can analyze fibers without damaging them are:

polarizing light microscopy and infrared spectroscopy.

polarizing light spectroscopy and infrared microscopy.

heat and light.

None of these choices.

Fibers are classified as either:

natural fibers or synthetic fibers.

polymers or synthetic fibers.

acrylic fibers or plant fibers.

olefins or synthetic fibers.

Natural plant fibers are produced by:

seeds.

fruits.

stems and leaves.

all of these choices.

All plant fibers share the common polymer that is:

cellulose.

protein.

sulfuric acid.

none of these choices.

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:

fruit fibers and polymers

regenerated fibers and polymers.

stem fibers and polymers.

seed fibers and polymers.

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

The most common form of fiber transfer to be encountered at a crime scene is _______________ of a textile.

At times, most fibers recovered from a victim are found in the victim's ____________________.

Natural fibers come from animals, plants, and ________________ that are mined from the ground.

Using the fiber burn analysis key, if a fiber does not smell like hair and it ceases to burn then it is _________________.

Mohair is hair from __________ (animal).

Celenese is cellulose chemically combined with ______________.

_____________________ has surface scales, hollow or partial hollow core and fibers up to 3 inches long.

What type of weave pattern is pictured?

Essay: Write the answer to one essay question in the space provided below.

FCA’s 1. Write in complete sentences and paragraph form.
2. Use Chapter 4 terminology to answer questions(example: fabric, twill, etc...).
3. Provide inferences, other thoughts, or personal experiences in your answer whenever possible.

A) A fiber is found on the victim, explain why this evidence alone is not enough to convict a suspect.

B) Choose a weave pattern, explain how the pattern is created and strengths/weaknesses of the weave.

manufacturing machine

Point of origin

color of hair

Type of fiber

Possibility of  violence

Location of suspects

length of fibers

color

Fiber evaluation can show

Fiber evaluation cannot show

Which of these is an example of circumstantial evidence?

victim recording

videotape footage

carpet fibers

eyewitness testimony

The most common type of regenerated fiber, which is derived from celulose and is mostly plant in origin, is rayon.

True

False

Synthetic polymer fibers, which all originate with petroleum products, are cellulose-based fibers.

True

False

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

True

False

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

True

False

Fibers are woven into textiles or fabrics.

True

False

Fibers that have been spun together are called:

a textile.

yarn.

a mineral fiber.

a fiber.

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.

Fiber evidence is gathered with: 

special vacuums.

sticky tape.

tweezers.

all of these choices.

Two methods that can analyze fibers without damaging them are: 

polarizing light microscopy and infrared spectroscopy.

polarizing light spectroscopy and infrared microscopy.

heat and light.

None of these choices.

Fibers are classified as either:

natural fibers or synthetic fibers.

polymers or synthetic fibers.

acrylic fibers or plant fibers.

olefins or synthetic fibers.

Natural plant fibers are produced by:

seeds.

fruits.

stems and leaves.

all of these choices.

All plant fibers share the common polymer that is:

cellulose.

protein.

sulfuric acid.

none of these choices.

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: 

fruit fibers and polymers

regenerated fibers and polymers.

stem fibers and polymers.

seed fibers and polymers.