Fibers - Presentation

Reorder

REVIEW: Correctly order the following steps to working a crime scene:

• Isolate and secure the scene

• Document the scene

• Search for evidence

• Collect and package the evidence

• Submit the evidence

1

2

3

4

5

• 1
• 2
• 3
• 4
• 5

Multiple Choice

What is the term for a material that has a definite shape and volume, often used in forensic science?

• amorphous

• crystalline

• polymer

• fiber

Multiple Choice

What is the difference between natural and synthetic fibers?

• Natural fibers come from nature, while synthetic fibers are artificially made.
• Natural fibers are always more durable than synthetic fibers.

Multiple Choice

The smallest unit of a textile or fabric is called a(n) ​ ______.

• thread
• yarn
• fabric
• fiber

Multiple Choice

What is the difference between primary and secondary transfer?

• Primary transfer is direct transmission; secondary transfer is via an intermediate host.
• Primary transfer involves multiple hosts; secondary transfer is direct transmission.

Multiple Choice

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

• necessary transfer

• primary (direct) transfer

• absolute transfer

• secondary transfer

Multiple Choice

What methods can be used to collect fiber evidence?

• Tape

• Vacuum

• Combing

• All of the above

Multiple Choice

What factors determine the value of fiber evidence in a crime investigation?

• Type of fiber

• Fiber color

• Number of fibers found

• Where the fiber was found

Multiple Choice

What factors are important in evaluating fiber evidence in forensic science?

• Textile origin

• Type of crime

• Time of discovery

• All of the above

Multiple Choice

What is a key characteristic of synthetic fibers?

• They are derived from plants

• They are always biodegradable

• They are man-made and often have uniform properties

• They are always more expensive than natural fibers

Multiple Choice

Which of the following observations are used to help identify a specific fiber?

• smell of the burned fiber

• on contact with the flame, does the fiber coil or melt?

• color and structure of the residue left after the fiber burn

• all of the above

Multiple Choice

Which of the following fibers is obtained from a rabbit?

• Mohair

• Wool

• Angora

• Cashmere

Multiple Choice

How long can a single silk fiber measure?

• 1-2 cm

• 1-2 km

• 1-2 m

• 1-2 yards

Multiple Choice

What is the primary component that all plant fibers share?

• Cellulose

• Protein

• Glucose

• Amorphous

Multiple Choice

What are the two types of leaf fibers mentioned in the image?

• Manila and Sisal

• Cotton and Wool

• Silk and Linen

• Hemp and Jute

Multiple Choice

What is the most common plant fiber found in the seed pod of the cotton plant?

• Silk

• Wool

• Cotton

• Linen

Multiple Choice

What is coir fiber obtained from?

• Coconut husk

• Cotton

• Jute

• Hemp

Multiple Choice

What are the uses of the following stem fibers: Flax, Ramie, Jute, and Hemp?

• Flax - used for clothing

• Ramie - used for ropes

• Jute - used for clothing

• Hemp - used for industrial purposes

Multiple Choice

Plant fibres are obtained from cotton plants and jute plants.

• true

• false

Multiple Choice

What are mineral fibers and why are they no longer commonly used?

• They are proteins used in textiles

• They are a collection of mineral crystals

• They are synthetic fibers

• They are biodegradable materials

Open Ended

Differentiate between a monomer and a polymer.

Multiple Select

What are the examples of synthetic polymer fibers mentioned in the image?

• Polyester

• Nylon

• Acrylic

• Olefin

Multiple Choice

What are the differences between natural and synthetic fibers based on their strength and durability?

• Synthetic fibers are weaker than natural fibers

• Manufactured fibers are damaged by microorganisms

• Synthetic fibers can deteriorate in bright sunlight

• Manufactured fibers are not damaged by microorganisms

Multiple Choice

Which of the following fibers has the smoothest appearance under microscopic analysis?

• Coarse Wool

• Silk

• Cotton

• Alpaca

Multiple Choice

What are the characteristics and uses of different types of fibers such as Cotton, Linen, Jute, and Wool?

• Cotton: Flattened hose appearance; used in many textiles

• Linen: Short brittle fibers; used in bed linens

• Wool: Helix-shaped; used in clothing and blankets

• Silk: Triangular fibers; used in clothing and bedding

Multiple Choice

What is the definition of a textile?

• A type of fabric made from synthetic materials

• A flexible, flat material made by interlacing yarns or threads

• A method of weaving fabrics

• A type of thread used in sewing

Multiple Choice

What are the two types of yarn directions shown in the diagram?

• Weft and Warp

• Plain and Twill

• Cotton and Wool

• Silk and Polyester

Multiple Choice

Looms are related to:

• Ginning

• Spinning

• Weaving

• Knitting

Multiple Choice

Which of the following process is carried out on looms ?

• Weaving

• Knitting

• Ginning

• Spinning

Multiple Choice

What are the three ways fabrics are differentiated?

• Color patterns, weight, durability
• Weave pattern, thread count, two-ply

Match

Match the weave to its description.

• Plain

• Basket

• Satin

• Twill

• Leno

A simple weave with no texture.

A weave that creates a sturdy fabric, often used for bags.

A weave that produces a glossy surface, often used for formal wear.

A diagonal weave that creates a strong fabric, often used for denim.

A weave that creates an open structure, often used for lightweight fabrics.

• A simple weave with no texture.

• A weave that creates a sturdy fabric, often used for bags.

• A weave that produces a glossy surface, often used for formal wear.

• A diagonal weave that creates a strong fabric, often used for denim.

• A weave that creates an open structure, often used for lightweight fabrics.