IFSTA 7 - Ch 20: Fire Origin and Cause Determination LATEST UPDATED 2025/2026 Exam WITH COMPLETE Questions And SURE VERIFIED SOLUTIONS 100% GRADED AT A+ SCORE!!

IFSTA 7 - Ch 20: Fire Origin and Cause Determination LATEST UPDATED 2025/2026 Exam WITH COMPLETE Questions And SURE VERIFIED SOLUTIONS 100% GRADED AT A+ SCORE!! Which is the most obvious sign of fire cause? Select one: a. Extent of damage b. Occurrence of flashover c. Time between incipient and growth stages d. Competent ignition source - ANSWER Competent ignition source If a deceased victim is encountered during the course of an incident or during the investigation,: Select one: a. firefighters must leave the scene immediately and turn control over to law enforcement. b. the victim should be left undisturbed and treated as evidence. c. the victim should be covered and then transported as soon as possible. d. firefighters must treat the scene as both a fire scene and a medical emergency incident. - ANSWER the victim should be left undisturbed and treated as evidence. Why is it important to determine the cause of a fire? Select one: a. So that the unsafe behavior that caused the fire can be corrected through educational programs for the public b. So firefighters can document which occupancies will require close supervision in the future c. So the owners of the property can be fined, if necessary d. So the homeowners or occupants can have peace of mind - ANSWER So that the unsafe behavior that caused the fire can be corrected through educational programs for the public An occupant stating that the room smelled like propane immediately before the fire started is an example of _____ evidence. Select one: a. circumstantial b. direct c. trace d. physical - ANSWER direct At a fire scene, firefighters should NOT: Select one: a. keep a written record of on-scene observations. b. share their opinion of the probable fire cause with media or bystanders. c. ask permission from owners before removing evidence from the building. d. enter the scene during a fire investigation without a warrant,. - ANSWER share their opinion of the probable fire cause with media or bystanders. How large should the perimeter outside a structure fire be? Select one: a. A minimum of 250 feet (75 m) in every direction from the building b. Large enough to surround the building and any adjacent exposure buildings c. Large enough to surround the building and all potential evidence outside the building d. A minimum of 100 feet (30 m) in every direction from the building - ANSWER Large enough to surround the building and all potential evidence outside the building When trying to locate the area of origin of a ground cover fire, you must know: Select one: a. construction types for buildings in the affected area. b. the precise time the fire started. c. the fire cause before determining the area of origin. d. how wind and topography can affect fire spread. - ANSWER how wind and topography can affect fire spread. Which characteristic must a material have to be the material first ignited? Select one: a. Exist in a liquid state b. Far enough from windows and doors to not be disturbed by airflow c. Exist in a gaseous state d. Close enough to the ignition source to receive energy from the ignition source - ANSWER Close enough to the ignition source to receive energy from the ignition source Lightning striking a tree and setting it on fire would be an example of a(an) _____ fire. Select one: a. accidental b. incendiary c. natural d. undetermined - ANSWER natural Which action can firefighters take to protect evidence at the fire scene? Select one: a. Delay fire suppression until evidence is collected b. Remove all evidence from the building c. Cover items with salvage covers or tarps d. Perform a thorough overhaul - ANSWER Cover items with salvage covers or tarps Which action should be carefully conducted, because it can cause destruction or contamination of evidence at a fire scene? Select one: a. Rescue b. Overhaul c. Size-up d. Rehabilitation - ANSWER Overhaul Which type of fuel source would require the greatest amount of heat to ignite because it must undergo pyrolysis in order to burn? Select one: a. Hydrogen b. Diesel fuel c. Gasoline d. Wood - ANSWER Wood Which statement describes how evidence should be handled at a fire investigation? Select one: a. Any firefighter who handles evidence becomes part of the chain of custody for that evidence. b. Evidence should be bagged and removed from the fire scene as quickly as possible. c. Evidence should be moved to a central location in the structure so that it is easy for the fire investigator to analyze. d. Firefighters are not responsible for any kind of evidence documentation. - ANSWER Any firefighter who handles evidence becomes part of the chain of custody for that evidence. Which would NOT be an example of physical evidence at a fire scene? Select one: a. Damage to electrical wiring b. Tire tracks outside the structure c. A witness's statement d. Debris from an explosion - ANSWER A witness's statement The events that lead up to a fuel package being ignited and starting a fire are known as the: Select one: a. decay stage. b. combustion chain reaction. c. ignition sequence. d. growth stage. - ANSWER ignition sequence.