Forensic Examination of Fibres

Description

Quiz on the examination techniques used for fibres.
Charlotte Camilla
Quiz by Charlotte Camilla, updated more than 1 year ago
Charlotte Camilla
Created by Charlotte Camilla over 10 years ago
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Resource summary

Question 1

Question
Which of These is Not a Cross Sectional Shape?
Answer
  • Hollow
  • Eliptical
  • Cylindrical
  • Fragmented
  • Trilobal

Question 2

Question
Which of These is Not a Cross Sectional Shape?
Answer
  • Hollow
  • Eliptical
  • Cylindrical
  • Fragmented
  • Trilobal

Question 3

Question
Which of the Following Would You Look For in a Natural Fibre?
Answer
  • Uneven Width
  • An Unusual Cross Sectional Shape
  • Irregular Surface
  • Scaly Appearance
  • The Presence of Delustrants
  • Smooth Surface

Question 4

Question
Interference Colours Viewed Under Polarising Light Microscopy Are Best Seen on White Fibres.
Answer
  • True
  • False

Question 5

Question
Interference Colours Give a Good Indication of the Type of Fibre Being Examined. A 1st Order Fibre is Likely To Be....?
Answer
  • Polyester
  • Acetate
  • Nylon

Question 6

Question
The Michel-Levy Chart is Used for Colours Seen With a Red Compensator Plate.
Answer
  • True
  • False

Question 7

Question
What Analytical Techniques Would You Use on Fibres?
Answer
  • Micro - Spectrophotometry
  • Thin Layer Chromatography
  • Infra-Red
  • Gas Chromatography
  • GC - Pyrolysis
  • Physical Fit

Question 8

Question
Which of These Illumination Types Would You Use in Fibre Examination?
Answer
  • Bright Field Illumination
  • Crossed Polars Illumination
  • UV Light Illumination
  • Blue Light Illumination

Question 9

Question
The Equation to Calculate the Refractive Indices of a Fibre (n) is: n = (speed of light in vacuum/speed of light in fibre).
Answer
  • True
  • False

Question 10

Question
Birefringence = (Optical path difference/thickness of fibre in micrometers).
Answer
  • True
  • False

Question 11

Question
What is the Meaning of Anisotropy?
Answer
  • Light Travels at Different Speeds in Different Directions in the Fibre.
  • Light Travels at Different Speeds in the Same Direction in the Fibre.
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