Forensics - Fibers and Textiles Online Quiz

Under a microscope, nylon fibers appear clear or translucent, whereas polyester fibers often appear more opaque or have distinct cross-sectional shapes.

Coir is a natural fiber extracted from the husk of coconuts, which classifies it as a fruit fiber.

Strangulation involves close physical contact between the suspect and the victim, which facilitates the significant transfer of fibers between their clothing.

Animal fibers are made of animal hair or secretions, which are fundamentally composed of protein chains like keratin or fibroin.

Plant fibers are derived from plant structures, which are structurally supported by cellulose.

Cloth gloves are porous and can easily contaminate evidence by transferring fibers from the gloves themselves to the sample, or by cross-contaminating samples.

Secondary transfer occurs when fibers are picked up from a source (like a couch) and then transferred to a second person, rather than coming directly from the original source to the victim.

Yarns are created by twisting or spinning individual fibers together to form a continuous strand suitable for weaving or knitting.

Abaca is a species of banana plant native to the Philippines, and its fibers are commonly known as Manila hemp.

Linen is a textile made from the fibers of the flax plant.

Direct transfer occurs when fibers are transferred directly from one source (the shirt) to another surface (the other person) through contact.

Forensic studies indicate that a significant majority of fibers are lost from a crime scene within the first 24 hours due to environmental factors and movement.

Asbestos is a naturally occurring mineral fiber known for its needle-like or spear-shaped structure and is categorized into six mineral types.

Cotton fibers grow from the seeds of the cotton plant, making them a seed fiber.

Rayon is a regenerated cellulose fiber and is widely recognized as the most common type of regenerated fiber in the textile industry.

Silk is produced by silkworms, which are animals, making it an animal fiber.

Polarizing light microscopy and infrared microscopy are both non-destructive techniques used to analyze fiber properties without altering the sample.

A twill weave is characterized by a diagonal pattern created by passing the weft thread over one or more warp threads and then under three or more, shifting the pattern each row.

The plain weave, also known as tabby or taffeta weave, is the simplest and most common weave pattern.

Synthetic polymer fibers, such as polyester and nylon, are manufactured from chemical compounds derived from petroleum.

Natural fibers (like cotton or wool) are organic and biodegradable, making them susceptible to degradation by microorganisms like mold or bacteria.

Synthetic fibers are essentially plastics, which have lower melting points and will melt when exposed to heat, whereas natural fibers typically char or burn.

Synthetic fibers are engineered for durability and strength, generally making them stronger and more resistant to wear than most natural fibers.

Natural fibers are derived from plants, animals, or minerals. Seed fibers (like cotton), mineral fibers (like asbestos), and animal fibers (like wool) all fall under this category.

Synthetic fibers are created through chemical processes rather than occurring naturally. They are commonly referred to as man-made fibers.