FS Fiber Study Guide

​Forensic Review Game
Fiber Chpt.4

By Omar Aboughali 2nd Prd 12/2/25

Multiple Choice

What are fibers in forensic science?

• Small threads from clothing, carpets, or other textiles

• Pieces of broken glass

• Drops of blood

• Fingerprints

Multiple Choice

When analyzing fiber transfer, what does the Locard’s Exchange Principle suggest?

• Fibers can only transfer in one direction

• Contact between two surfaces results in mutual exchange of trace materials

• Only natural fibers follow this principle

• Fiber transfer requires visible staining

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

A type of test that observation of how a fiber burns, the odor, color of flame, smoke and the appearance of the residue

• Burn Test

• Stain Test

• Pyrolysis Gas Chromatography

• Thermal decomposition

Multiple Choice

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

• necessary transfer

• direct transfer

• absolute transfer

• secondary transfer

Multiple Choice

Fibers are a what type of evidence

• identification using various microscopes, gas chromatography, and mass spectrometers is possible.

• a form of class evidence used by CSI; they are a form of trace evidence

• Class evidence that's never used in trials

• Not traceable

Multiple Choice

What is the primary purpose of fiber analysis in forensic science?

• To determine the exact age of the suspect

• To identify the brand of clothing worn

• To link a suspect or object to a crime scene through trace evidence

• To measure the temperature at the crime scene

Multiple Choice

Which of the following is the most common synthetic fiber?

• Cotton

• Silk

• Wool

• Polyester

Multiple Choice

Why are fibers considered class evidence rather than individual evidence?

• Because they always contain DNA

• Because they can only be found on carpets

• Because they can narrow down sources but not uniquely identify one person

• Because they are invisible to the human eye

Multiple Choice

What is the most common natural fiber found in clothes and sheets?

• Cotton

• Polyester

• Nylon

• Acrylic

Multiple Choice

Which of the following is a common source of fiber evidence at crime scenes?

• Soil samples from shoes

• Tire marks on pavement

• Fingerprints on glass

• Carpets and upholstery

Multiple Choice

Pick the answer choice that correctly matches these weave types in order. (Not on final)

• Plain

  Satin

  Twill

• Satin

  Plain

  Twill

• Plain

  Twill

  Satin

• Twill

  Plain

  Satin

Multiple Choice

Which is a NON-Damaging analysis

• Ultraviolet light analysis

• Pyrolysis Gas Chromatography

• Infrared Analysis

• None of the above

Multiple Choice

Why is fiber color analysis important in forensic investigations? (Not on final)

• It helps distinguish between fibers that look similar but have different dye compositions

• It proves the exact manufacturer of the clothing

• It determines the age of the fiber sample

• It shows how long the fiber has been exposed to sunlight

Multiple Choice

Which instrumental method is most effective for identifying the chemical composition of synthetic fibers? (Not on final)

• Atomic absorption spectroscopy (AAS)

• Thin-layer chromatography (TLC)

• Fourier-transform infrared spectroscopy (FTIR)

• Gas chromatography-mass spectrometry (GC-MS) without pyrolysis

Multiple Choice

Why is fiber evidence often considered circumstantial rather than conclusive?(Not on final)

• Because fibers are only found indoors

• Because fibers cannot be collected without damaging clothing

• Because fibers always degrade within 24 hours

• Because fibers can suggest association but cannot uniquely identify a single source

Multiple Choice

Which factor most affects how long fibers remain on clothing? (Not on final)

• The age of the person wearing the clothing

• The color of the clothing

• The type of fiber and the amount of physical activity after transfer

• The size of the crime scene

Multiple Choice

What does the number of fibers transferred usually indicate in forensic analysis?

• The intensity and duration of contact between surfaces

• The detergent used on clothing

• The humidity of the environment

• The age of the suspect