Take this short quiz after watching the presentation in order to test your understanding of the material.

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1. Your Information:

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2. The National Institute of Standards and Technology (NIST) was tasked by Congress with determining how and why the Twin Towers collapsed. The most important aspect of the ensuing NIST report was its “probable collapse sequence,” which outlined the steps that led to collapse. Which of the following is true about that report?

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3. Other than on 9/11, fire has never caused the collapse of a steel-framed high-rise.  What is a  possible reason for this?

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4. The New York Times called which of the following the “greatest mystery uncovered in the investigation”:

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5. Evidence of extreme temperatures documented at the World Trade Center, exceeding the temperatures of the hottest office fires by a factor of two or three, included:

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6. NFPA 921: Guide for Fire and Explosion Investigations admonishes investigators to look for what signs of explosions and/or incendiaries?

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7. Can the combination of an uncontrolled fire and structural damage from an airplane account for steel members in the debris pile that appear to have been partly evaporated?

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8. The police museum in New York has an exhibit with a handgun, recovered from the basement of World Trade Center Building 6, which was almost entirely covered in previously molten concrete. The exhibit’s sign reads: “Fire temperatures were so intense that concrete melted like lava around everything in its path.” The melting of this concrete could only have occurred as a result of:

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9. True or False: Early in the investigation, structural engineer John Gross, an author of both the FEMA and NIST reports, was involved in retrieving melted steel members that became the focus of a detailed metallurgical examination, documented in Appendix C of the FEMA report. Despite the fact that the FEMA report called for further study of the melted steel members, the NIST investigation later omitted this topic from its final report.

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10. Evidence of the use of thermite, an incendiary that creates molten iron at temperature’s exceeding 4,000°F, was found at the WTC in what forms?

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11. True or False: After claiming that it found no evidence of explosives or residue of explosives at the World Trade Center, NIST acknowledged in its Frequently Asked Questions that it had never tested for such evidence.

(This concludes the quiz. The following questions are optional.)

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12. Optional: Would you like to receive our occasional email news bulletins?

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13. Optional: Do you believe that a new investigation into the collapse of World Trade Center Building 7 is warranted?

 
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