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Firearms and Toolmarks Introduction Quiz
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Firearms and Toolmarks Introduction Quiz

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Questions and Answers

What is the purpose of rifling in firearms?

  • To decrease the accuracy of the firearm
  • To increase the rate of fire
  • To impart stability to the bullet (correct)
  • To prevent the bullet from exiting the barrel
  • What is the relationship between barrel length and firearm accuracy?

  • Long barrel and more gunpowder provide high velocity, stability, and range, leading to greater accuracy (correct)
  • Long barrel decreases stability and accuracy of the firearm
  • Shorter barrels provide higher accuracy due to better maneuverability
  • Barrel length has no impact on firearm accuracy
  • How is the caliber of a firearm bore measured?

  • By the weight of the firearm
  • By the length of the firearm
  • By the color of the firearm
  • In hundredth or thousandth of an inch or in millimeters (correct)
  • What are the components of a rifle?

    <p>Barrel, firing chamber, shoulder stock, provision for loading and unloading</p> Signup and view all the answers

    Which method assumes straight line trajectories and is applicable for high velocity, moderate distant shots?

    <p>Determine Trajectory Patterns</p> Signup and view all the answers

    What are the factors involved in trajectory analysis?

    <p>Initial angle of firing, energy lost in passing through surfaces, and type of firearm &amp; ammunition</p> Signup and view all the answers

    What is used to detect muzzle-to-target distance of lead?

    <p>Sodium rhodizonate</p> Signup and view all the answers

    What is the product of the detonation of gunpowder used in the Griess test?

    <p>$NO_2$</p> Signup and view all the answers

    What is used to form a diazonium salt in the Griess test?

    <p>$Sulfanilic acid$</p> Signup and view all the answers

    What can be identified by a combination of morphology (spheroidal shape) and chemical composition (lead, barium and antimony from primer vaporization)?

    <p>Gunshot Residue (GSR)</p> Signup and view all the answers

    What should be examined to determine if the suspect's tool caused markings?

    <p>Original mark.</p> Signup and view all the answers

    What should not be done when experimenting with the angle of use and portion used?

    <p>Compare to exemplar if suspect tool is found.</p> Signup and view all the answers

    What should be considered when determining the type of tool used?

    <p>Both size of marking portion of tool and unusual features of tool.</p> Signup and view all the answers

    What is used to detect GSR patterns on dark/patterned targets?

    <p>Chemical color/transfer tests.</p> Signup and view all the answers

    What should not be attempted at the scene when dealing with suspected toolmarks?

    <p>Match suspected tool to toolmark at the scene.</p> Signup and view all the answers

    Which component is not typically found in a cartridge?

    <p>Gunpowder</p> Signup and view all the answers

    What is the purpose of single-base and double-base primers in ammunition?

    <p>To ignite the propellant</p> Signup and view all the answers

    What method is used for examining bullets and cartridge cases?

    <p>Microscopy</p> Signup and view all the answers

    What firearm feature contributes to its uniqueness in creating bullet striations?

    <p>Number and size of lands and grooves</p> Signup and view all the answers

    What does current computerized firearms evidence analysis include?

    <p>Reconstructions and trajectory determinations</p> Signup and view all the answers

    Study Notes

    Forensic Firearms Evidence Analysis

    • Cartridges with the same bore size may contain different ammunition types
    • Firearms actions include bolt action, lever action, hinged frame, pump action, and semi-automatic
    • Cartridges are the typical unit of ammunition and hold projectiles, propellant, and primer
    • Ammunition types include projectiles, propellant, and primer, with different compositions
    • Primer types include single-base (nitrocellulose) and double-base (nitrocellulose and nitroglycerin)
    • Collection and preservation of firearms evidence involves avoiding contamination and labeling
    • Microscopy and comparison microscope are used for examining bullets and cartridge cases
    • Striations on bullets and the number and size of lands and grooves are unique to the firearm
    • Cartridge case comparisons involve breechface markings and firing pin indentations
    • Computerized firearms evidence analysis allows rapid cross comparison of bullets and casings
    • Early computerized firearms evidence analysis databases are for screening purposes only
    • Current computerized firearms evidence analysis includes reconstructions and trajectory determinations

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    Description

    Test your knowledge on the introduction to firearms and toolmarks, including the types of firearms such as rifles, pistols, and shotguns. Learn about the similarities in the analysis of markings and different characteristics of firearms.

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