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WorksheetsFibers Test Review
Total questions: 21
Worksheet time: 11mins
Silk
Natural
Synthetic
Polyester
Natural
Synthetic
Asbestos
Natural
Synthetic
Cashmere
Natural
Synthetic
Linen
Natural
Synthetic
Olefin
Natural
Synthetic
Acrylic
Natural
Synthetic
After a burn test, an unknown sample appears to be sticky. It then dries and hardens in the shape it was left to dry in. Which of these fibers could be the unknown?
Cotton
Linen
Silk
Olefin
Which of the following explains why fabric is valuable as evidence?
It is commonly left at crime scenes
It can be used as a basis for comparison when trying to match an unknown and known sample
It can be traced back to one individual person
Like hair evidence, fiber evidence needs to be collected very quickly from a crime scene because
It is trace evidence and easily lost
It can deteriorate in cold or hot conditions very quickly
It needs to be the first evidence sent to the lab because it is the most reliable
It does not need to be collected quickly, it can be collected at any time
Which of these does NOT originally come from a plant source?
Silk
Acetate
Linen
Cotton
A forensic scientist takes a fiber sample and applies acid to it. She then extracts the dye and analyzes its components. This is a….
Refractive Index Test
Burn Test
Chromatography Test
Density Test
Only a few fibers are recovered from the clothing a victim was wearing at the time of her attack. They were carefully collected and need to be analyzed. Which of these tests should be done first?
Burn Test
Refractive Index Test
Chromatography Test
Dye Test
Is this most likely a natural fiber or synthetic fiber?
Natural
Synthetic
Is this most likely a natural or synthetic fiber?
Natural
Synthetic
Fibers are _______ evidence
Class
Trace
Individual
Indirect
Choose the answer that lists possible characteristics of a synthetic fiber
Appears smooth under the microscope, fire resistant, waterproof, can have cuticles, and is strong
Appears rough under the microscope, can have cuticles, strong and typically expensive
Appears smooth under the microscope, melts when heated, typically cheaper
Appears rough under the microscope, no cuticles, melt when heated
Which of the following is a FALSE statement
Fibers are analyzed for density, color, fluorescence, and burn behavior
Cashmere, wool, and polyester fibers are fire resistant
Oblique lighting is a useful technique for finding fibers at a crime scene
Synthetic fibers usually produce ash after being burned
A mineral based fiber that used to be used as an insulation material, but was found to be carcinogenic and is now only in older buildings
Rayon
Asbestos
Linen
Acetate
A highly common natural fiber found in clothing and household products
Cotton
Rayon
Acrylic
Nylon
What would indicate a fiber could possibly include hair from an animal?
It looks smooth under a microscope
It has a medulla
It is cheaper
It is strong
