Question 1

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

Accepted Answer

Rayon is indeed the most common type of regenerated fiber, derived from cellulose, which is primarily obtained from wood pulp and cotton, making it mostly plant in origin.

Question 2

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

Accepted Answer

Polyester is resistant to light and chemicals, including most acids, which makes it more durable in such conditions compared to nylon, which is more sensitive to light and acids.

Question 3

Fibers are woven into textiles or fabrics.

Accepted Answer

Fibers are the basic building blocks that are spun into yarns, which are then woven or knitted into textiles or fabrics.

Question 4

Early collection of fibers in an investigation is critical.Within 24 hours, an estimated:

Accepted Answer

Within 24 hours, an estimated 95% of all fibers may have fallen from a victim or been lost from a crime scene, highlighting the importance of early collection in forensic investigations.

Question 5

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

Accepted Answer

Manufactured fibers, such as polyester and nylon, can indeed deteriorate under prolonged exposure to bright sunlight due to UV degradation, and they generally have lower melting points compared to natural fibers like cotton or wool, making them more susceptible to damage from high temperatures.

Question 6

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

Accepted Answer

Monomers are small molecules that can bond to other similar molecules to form a polymer.

Question 7

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

Accepted Answer

Synthetic polymer fibers are not cellulose-based; they are primarily derived from petrochemicals, whereas cellulose-based fibers come from plants.

Question 8

Fibers are classified as either:

Accepted Answer

Fibers are broadly classified into two main categories: natural fibers, which are obtained from plants, animals, or minerals (such as cotton, wool, and silk), and synthetic fibers, which are man-made, typically from chemical sources (such as polyester and nylon).

Question 9

All plant fibers share the common polymer that is:

Accepted Answer

Cellulose is the common polymer found in all plant fibers, providing structural support to the plant cell walls.

Question 10

Natural fibers come from:

Accepted Answer

Natural fibers can originate from animals (such as wool from sheep), plants (such as cotton and linen), and minerals that are mined from the ground (such as asbestos). Therefore, all of these sources are correct.

Question 11

Weave patterns have names like tabby, twill and __________________.

Accepted Answer

The answer of Weave patterns have names like tabby, twill...

Question 12

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

Accepted Answer

Direct transfer occurs when fibers are transferred directly from the victim to the suspect or vice versa, without any intermediary surfaces or objects involved.

Question 13

Fibers that have been spun together are called:

Accepted Answer

Yarn is the correct term for fibers that have been spun together. This process combines the individual fibers to create a long, continuous strand that can be used in knitting, weaving, or crocheting to make textiles.

Question 14

The simplest weave pattern is the plain, or _______________________, weave.

Accepted Answer

The answer of The simplest weave pattern is the plain,...

Question 15

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

Accepted Answer

Secondary transfer occurs when evidence is passed from a source to a person and then from that person to another person.

Question 16

Two methods that can analyze fibers without damaging them are:

Accepted Answer

Polarizing light microscopy and infrared spectroscopy are non-destructive techniques that can analyze fibers without causing damage, allowing for detailed examination of their properties.

Question 17

Natural plant fibers are produced from:

Accepted Answer

Natural plant fibers can come from seeds (like cotton), fruits (like coir from coconuts), and stems and leaves (like flax from stems and sisal from leaves), making all of these choices correct sources of natural plant fibers.

Question 18

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:

Accepted Answer

Synthetic fibers are categorized as regenerated fibers and polymers. Regenerated fibers are derived from natural materials by processing them into a fiber structure, while polymers are entirely synthetic, created through chemical processes.

Question 19

One seed fiber is:

Accepted Answer

Cotton is the correct answer because it is a natural fiber that grows in the seed pod of the cotton plant, making it a seed fiber. Coir is derived from the husk of coconuts, hemp and jute are both stem fibers, not seed fibers.

Question 20

Fiberglass is a fiber form of:

Accepted Answer

Fiberglass is made from extremely fine fibers of glass and is used in a variety of applications for its strength, durability, and lightweight properties.

Quiz 4: A Study of Fibers and Textiles