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Collapse of the World Trade Center: Quiz

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Question 1: The floors consisted of 4 inches (10 cm) thick lightweight ________ slabs laid on a fluted steel deck.
ConcreteRoadStreetBrick

Question 2: As the fires continued to burn, occupants trapped in the upper floors of the South Tower provided information about conditions via ________.
Emergency medical services9-1-1Emergency telephone numberEnhanced 911

Question 3: According to a 2006 poll, 16 percent of American adults believed that the World Trade Center may have been destroyed by ________ rather than resulting from the plane impacts.
DemolitionTampa StadiumNew Haven, ConnecticutConstruction

Question 4: [21] At 9:52 a.m., the ________ (NYPD) aviation unit reported over the radio that "large pieces may be falling from the top of WTC 2.
New York City HallNew York City Sheriff's OfficeNew York City Fire DepartmentNew York City Police Department

Question 5: In 2003, three engineers at the ________ published a paper in which they provisionally concluded that the fires alone (without any damage from the airplanes) could have been enough to bring down the WTC buildings.
University of BristolUniversity of CambridgeUniversity of OxfordUniversity of Edinburgh

Question 6: The floors were connected to the perimeter spandrel plates with ________ dampers, which helped reduce the amount of sway felt by building occupants.
ViscosityLinear elasticityViscoelasticitySolid

Question 7: In July 1945, a ________ that was lost in the fog had crashed into the 79th floor of the Empire State Building.
T-6 TexanB-29 SuperfortressB-24 LiberatorB-25 Mitchell

Question 8: [29] ________, who designed the Petronas Towers in Malaysia and the World Financial Center in New York, remarked, "no building is prepared for this kind of stress."[30]
United StatesNew York CityCésar PelliBoston

Question 9: On September 18, 2001, the ________ (EPA) issued a statement assuring the public that the air in Manhattan was "safe to breathe".
ColoradoUnited States Environmental Protection AgencyFloridaOklahoma

Question 10: The ________ (FEMA) completed its performance study of the buildings in May 2002.
Federal Protective Service (United States)Federal Emergency Management AgencyUnited States Secret ServiceUnited States Coast Guard







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