Explosives Overview Quiz
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Explosives Overview Quiz

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Questions and Answers

What characteristic distinguishes high explosives from low explosives?

  • High explosives detonate without confinement. (correct)
  • High explosives are primarily used as propellants.
  • High explosives require confinement to explode.
  • High explosives can only be ignited by flame.

    • Which of the following is an example of a low explosive?

  • Black powder (correct)
  • RDX
  • TNT
  • Dynamite

    • What is a characteristic of primary high explosives?

  • They have a pushing effect when ignited.
  • They are packaged as blasting caps. (correct)
  • They are less sensitive to shock than low explosives.
  • They can be ignited with a flame.

    • Which of the following statements about low explosives is true?

    <p>Low explosives must be confined and ignited to explode.</p> Signup and view all the answers

    Which example is associated with military explosives?

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

    What must initiate secondary high explosives?

    <p>A shock wave</p> Signup and view all the answers

    Which of the following is NOT a characteristic of low explosives?

    <p>They can explode without confinement.</p> Signup and view all the answers

    What is a key feature of Improvised Explosive Devices (IEDs)?

    <p>They can be made from various common filler materials.</p> Signup and view all the answers

    What should never be used for packaging materials that continue to react when exposed to metal?

    <p>Metal packaging</p> Signup and view all the answers

    What is the preferred method for submitting fireworks that are part of an IED?

    <p>Use a clean, unused, lined metal paint can</p> Signup and view all the answers

    Which of the following statements about intact devices is true?

    <p>Any intact device must be rendered safe by qualified personnel before submission.</p> Signup and view all the answers

    What distinguishes legal from illegal fireworks in Virginia?

    <p>Their function</p> Signup and view all the answers

    What type of packaging is preferred for bottle bombs?

    <p>Plastic packaging</p> Signup and view all the answers

    What type of container should be used for volatile materials to prevent evaporation?

    <p>Air-tight container</p> Signup and view all the answers

    Which method is recommended for packaging unconsumed low explosives?

    <p>Pink anti-static plastic bag</p> Signup and view all the answers

    What should be done if nitroglycerin-based dynamite is suspected?

    <p>Package in a clean, unused, lined metal paint can</p> Signup and view all the answers

    How much of a pyrotechnic safety fuse or detonation cord should be collected?

    <p>6 inches</p> Signup and view all the answers

    What is the consequence of using regular plastic bags with low explosive powders?

    <p>They may cause ignition due to static electricity</p> Signup and view all the answers

    When packaging bottle bombs, what should be removed from the bottle?

    <p>Liquid and foil</p> Signup and view all the answers

    Which container is NOT recommended for packaging low explosives?

    <p>Regular plastic bags</p> Signup and view all the answers

    What should be done to protect the ends of the pyrotechnic fuse during packaging?

    <p>Wrap in paper</p> Signup and view all the answers

    What materials are most commonly used for constructing containers for explosive devices?

    <p>Metal and PVC pipe nipples</p> Signup and view all the answers

    Which of the following methods should be followed for the collection of intact, live explosive devices?

    <p>Render the device safe using qualified individuals prior to submission</p> Signup and view all the answers

    What should be done with materials that have sharp edges and may contain volatile substances?

    <p>Place them in lined, metal paint cans</p> Signup and view all the answers

    Which of the following is NOT identified in the capabilities and services offered?

    <p>Identification of substandard materials</p> Signup and view all the answers

    What type of evidence is mentioned as being acceptable in a plastic bag unless latent print processing is requested?

    <p>Wires, clocks, timers, batteries, fuses, and wrappers</p> Signup and view all the answers

    What is required to accompany the submission of a live explosive device to the laboratory?

    <p>Details on how the device was rendered safe</p> Signup and view all the answers

    What should comparison samples for explosive residues analysis consist of when analyzing concrete?

    <p>Concrete that contains no suspected explosive residues</p> Signup and view all the answers

    Which method is recommended for collecting post-blast materials found near the explosion site?

    <p>Use clean, unused, lined, metal paint cans</p> Signup and view all the answers

    Study Notes

    Explosives: Overview

    • Explosives are classified as low or high.
    • Low explosives are primarily used as propellants and generate large volumes of gas.
    • Low explosives include black powder, black powder substitutes, smokeless powder, flash powder, match heads, and firework powder.
    • Low explosives can be ignited with a flame.
    • High explosives detonate and do not need confinement to explode.
    • High explosives are designed to shatter and destroy.
    • High explosives include initiating explosives such as mercury fulminate and lead azide, commercial explosives such as Tovex, ANFO, and dynamite, and military explosives such as TNT, RDX, and C-4.
    • Primary high explosives are extremely sensitive to shock, friction, flame, and/or heat.
    • Primary high explosives are often packaged as blasting caps and are HAZARDOUS.
    • Secondary high explosives are relatively insensitive to shock, friction, flame, and/or heat.
    • Secondary high explosives must be initiated with a shock wave, often produced by a primary high explosive.
    • Improvised Explosive Devices (IEDs) can be constructed with a variety of common filler materials such as black powder, black powder substitutes, powder from fireworks, match heads, and chlorate/sugar mixtures.
    • Commonly encountered IED containers include threaded metal or PVC pipe nipples with end caps.

    Laboratory Capabilities and Services

    • The Trace Evidence Laboratory offers specialized services for explosives analysis.
    • Services include the identification of IED components, construction analysis, analysis of explosive fillers and residues, and the identification of unconsumed low explosive powder and high explosives.
    • The laboratory also specializes in the analysis of bottle bombs.

    Collection Guidelines for Explosives Evidence

    • Intact, Live Explosive Devices: The lab will not accept live explosive devices. Qualified personnel must render the device safe prior to laboratory submission.
    • Post-blast or Rendered Safe Evidence: Fragments with sharp, jagged edges or suspected volatile materials should be placed in clean, unused, lined, metal paint cans. Porous materials near the blast site should also be collected, along with comparison samples of similar materials.
    • Unconsumed Low Explosives: Powder should be placed in a small, heat-, shock-, friction-, and spark-resistant container, such as a pink anti-static plastic bag. Do not use regular plastic bags due to the risk of static electricity igniting the powder.
    • Undetonated Secondary High Explosives: Collect a small sample and package in a glass vial, plastic bag, or clean, unused, lined metal paint can. For suspected nitroglycerin-based dynamite, use a clean, unused, lined metal paint can.
    • Pyrotechnic Safety Fuse or Detonation Cord: Collect no more than approximately a 6 inch piece, wrap in paper, and place in a plastic bag.
    • Bottle Bombs: Remove any liquid and foil, package separately in plastic, and avoid using metal. Glass containers can be used, but the lid must be metal-free.
    • Fireworks: Do not submit intact commercial fireworks unless necessary. Submit fireworks that are part of an IED, have been modified, or may have been the source of filler in an IED.

    Submission Reminders

    • Never submit live devices or intact blasting caps.
    • Render any device safe prior to submission.
    • Use clean, unused, lined metal paint cans for sharp metal objects or volatile materials.
    • Use plastic for bottle bombs.
    • Provide as much information related to the incident as possible on the Request for Laboratory Examination form (RFLE).
    • Include details on the potential target, smoke, sound, and flash descriptions.

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    Related Documents

    Virginia Department of Forensic Science Explosives Guide PDF

    Description

    Test your knowledge on the classification of explosives, including their uses and characteristics. This quiz covers both low and high explosives, detailing their applications, ignition methods, and sensitivity. Perfect for those interested in chemistry or materials science.

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