Charlotte Camilla
Quiz by , created more than 1 year ago

Quiz on the examination techniques used for fibres.

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Charlotte Camilla
Created by Charlotte Camilla over 10 years ago
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Forensic Examination of Fibres

Question 1 of 11

1

Which of These is Not a Cross Sectional Shape?

Select one of the following:

  • Hollow

  • Eliptical

  • Cylindrical

  • Fragmented

  • Trilobal

Explanation

Question 2 of 11

1

Which of These is Not a Cross Sectional Shape?

Select one of the following:

  • Hollow

  • Eliptical

  • Cylindrical

  • Fragmented

  • Trilobal

Explanation

Question 3 of 11

1

Which of the Following Would You Look For in a Natural Fibre?

Select one or more of the following:

  • Uneven Width

  • An Unusual Cross Sectional Shape

  • Irregular Surface

  • Scaly Appearance

  • The Presence of Delustrants

  • Smooth Surface

Explanation

Question 4 of 11

1

Interference Colours Viewed Under Polarising Light Microscopy Are Best Seen on White Fibres.

Select one of the following:

  • True
  • False

Explanation

Question 5 of 11

1

Interference Colours Give a Good Indication of the Type of Fibre Being Examined. A 1st Order Fibre is Likely To Be....?

Select one of the following:

  • Polyester

  • Acetate

  • Nylon

Explanation

Question 6 of 11

1

The Michel-Levy Chart is Used for Colours Seen With a Red Compensator Plate.

Select one of the following:

  • True
  • False

Explanation

Question 7 of 11

1

What Analytical Techniques Would You Use on Fibres?

Select one or more of the following:

  • Micro - Spectrophotometry

  • Thin Layer Chromatography

  • Infra-Red

  • Gas Chromatography

  • GC - Pyrolysis

  • Physical Fit

Explanation

Question 8 of 11

1

Which of These Illumination Types Would You Use in Fibre Examination?

Select one or more of the following:

  • Bright Field Illumination

  • Crossed Polars Illumination

  • UV Light Illumination

  • Blue Light Illumination

Explanation

Question 9 of 11

1

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

Select one of the following:

  • True
  • False

Explanation

Question 10 of 11

1

Birefringence = (Optical path difference/thickness of fibre in micrometers).

Select one of the following:

  • True
  • False

Explanation

Question 11 of 11

1

What is the Meaning of Anisotropy?

Select one of the following:

  • Light Travels at Different Speeds in Different Directions in the Fibre.

  • Light Travels at Different Speeds in the Same Direction in the Fibre.

Explanation

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