Which choice is NOT listed as a sign of imminent structural collapse?

• A. Cracks and bulges in exterior walls
• B. Popping noises in the ceiling
• C. Sounds of structural movement
• D. Walls/columns leaning

Answer: (B)

On the fireground, signs of imminent structural collapse come from clear changes in the building’s structural integrity: cracks or bulges in exterior walls show deformation of load-bearing members, and walls or columns leaning indicates a loss of vertical support. audible movement of the structure—sounds of structural movement—signals that the framework is shifting and could give way soon. Popping noises in the ceiling aren’t typically listed as a definitive sign of imminent collapse in this material; they can stem from non-structural sources like thermal expansion, roof components, or settling, and do not alone confirm an unstable structure. So while any unusual sound or movement warrants caution, the concrete indicators are visible deformation and leaning, plus audible movement, rather than ceiling pops.