Chapter 12: Collapse

Question 1

1:  How tall was the South Tower of the World Trade Center? 
 A: 1248 feet  
 B: 1362 feet  
 C: 1368 feet  
 D: 1374 feet

Answer 1

B: 1362 feet

Question 2

2:  Which of the following was not one of the four major structural components that compromised the World Trade Center buildings? 
 A: The exterior walls 
 B: The interior walls 
 C: Columns within the center core 
 D: Hat truss

Answer 2

B: The interior walls

Question 3

3:  Where did the aircraft impact the North Tower of the World Trade Center on September 11, 2001?  
 A: Between floors 85 and 89 
 B: Between floors 93 and 99 
 C: At floor 86 
 D: At floor 94

Answer 3

B: Between floors 93 and 99

Question 4

4:  How many center core columns were stripped of fireproofing in the North Tower of the World Trade Center during the 2001 terrorist attacks?  
 A: 27 
 B: 35 
 C: 43 
 D: 54

Answer 4

C: 43

Question 5

5:  How many center core columns were destroyed in the South Tower of the World Trade Center during the terrorist attacks? 
 A: 10 
 B: 19 
 C: 24 
 D: 32

Answer 5

A: 10

Question 6

MATCHING
Type of collapse that occurs after initial collapse
1. Global
2. Partial
3. Progressive
4. Secondary
5. Pancake
6. Lean-to-floor
7. V-shaped
8. Cantilever
9. Tent
10. Lean over

Answer 6

4. Secondary

Question 7

MATCHING
Type of collapse in which the floor of a building collapses and one end of the floor is still supported, creating a triangular void space
1. Global
2. Partial
3. Progressive
4. Secondary
5. Pancake
6. Lean-to-floor
7. V-shaped
8. Cantilever
9. Tent

Answer 7

6. Lean-to-floor

Question 8

MATCHING
Type of collapse involving the complete failure of the building
1. Global
2. Partial
3. Progressive
4. Secondary
5. Pancake
6. Lean-to-floor
7. V-shaped
8. Cantilever
9. Tent
10. Lean over

Answer 8

1. Global

Question 9

MATCHING
Type of collapse in which a relatively small area of structural damage results in a loss of localized load-carrying capability
1. Global
2. Partial
3. Progressive
4. Secondary
5. Pancake
6. Lean-to-floor
7. V-shaped
8. Cantilever
9. Tent
10. Lean over

Answer 9

3. Progressive

Question 10

MATCHING
Type of collapse in which one end of the collapsed floor is supported by an interior wall, creating two void spaces
1. Global
2. Partial
3. Progressive
4. Secondary
5. Pancake
6. Lean-to-floor
7. V-shaped
8. Cantilever
9. Tent
10. Lean over

Answer 10

9. Tent

Question 11

MATCHING
Type of collaps in which the floor falls near its center, with the perimeter of the floor still partially supported by walls
1. Global
2. Partial
3. Progressive
4. Secondary
5. Pancake
6. Lean-to-floor
7. V-shaped
8. Cantilever
9. Tent
10. Lean over

Answer 11

7. V-shaped

Question 12

MATCHING
Type of collapse in which one end of the floor is supported while the other is not
1. Global
2. Partial
3. Progressive
4. Secondary
5. Pancake
6. Lean-to-floor
7. V-shaped
8. Cantilever
9. Tent
10. Lean over

Answer 12

8. Cantilever

Question 13

MATCHING
Type of collapse resulting from a failure of the portion of the building
1. Global
2. Partial
3. Progressive
4. Secondary
5. Pancake
6. Lean-to-floor
7. V-shaped
8. Cantilever
9. Tent
10. Lean over

Answer 13

2. Partial

Question 14

MATCHING
Type of collapse limited to wood-frame structures
1. Global
2. Partial
3. Progressive
4. Secondary
5. Pancake
6. Lean-to-floor
7. V-shaped
8. Cantilever
9. Tent
10. Lean over

Answer 14

10. Lean over

Question 15

MATCHING
Type of collapse in which the building's floors stack on top of each other
1. Global
2. Partial
3. Progressive
4. Secondary
5. Pancake
6. Lean-to-floor
7. V-shaped
8. Cantilever
9. Tent
10. Lean over

Answer 15

5. Pancake

Question 16

MULTIPLE CHOICE
Which of the following has the greatest potential to kill large numbers of fire fighters in one incident?
A. Heart attack
B. Collapse
C. Smoke Inhalation
D. Falls

Answer 16

B. Collapse

Question 17

MULTIPLE CHOICE
Who is responsible for anticipating a collapse?
A. Incident commander
B. Operations chief
C. Safety officer
D. All of the above

Answer 17

D. All of the above

Question 18

MULTIPLE CHOICE
In which of the following types of collapse do the walls fall straight down?
A. Curtain fall wall collapse
B. Inward outward collapse
C. Lean-to floor collapse
D. 90-degree wall collapse

Answer 18

A. Curtain fall wall collapse

Question 19

MULTIPLE CHOICE
In which of the following types of collapse do the exterior walls fall horizontally?
A. Curtain fall wall collapse
B. Inward outward collapse
C. Lean-to floor collapse
D. 90-degree wall collapse

Answer 19

B. Inward outward collapse

Question 20

MULTIPLE CHOICE
Collapse zones are generally what distance from a wall?
A. one-third the height of the wall
B. One-half the height of the wall
C. The height of the wall
D. Twice the height of the wall

Answer 20

C. The height of the wall