RIA NFPA 921 Fire Investigation 3

Question 1

NFPA 921 classifies fire causes into which four categories?

Accepted Answer

Accidental, natural, incendiary, and undetermined

Answer

NFPA 921 defines the four fire cause classifications as accidental, natural, incendiary, and undetermined.

Question 2

When is it appropriate for an investigator to classify a fire cause as 'undetermined' per NFPA 921?

Accepted Answer

When the evidence does not support any single cause classification

Answer

NFPA 921 states undetermined is appropriate when collected evidence is insufficient to support one cause classification to a reasonable degree of certainty.

Question 3

Which laboratory analysis technique does NFPA 921 recommend for identifying ignitable liquid residues in fire debris?

Accepted Answer

Gas chromatography–mass spectrometry (GC-MS)

Answer

GC-MS is the ASTM E1618-standard method recommended in NFPA 921 for identifying ignitable liquid residues in fire debris samples.

Question 4

Per NFPA 921, which of the following is NOT a reliable indicator of accelerant use?

Accepted Answer

Unusual fire spread speed reported by witnesses

Answer

Witness perception of unusual fire speed is subjective and unreliable; physical and laboratory evidence are the accepted indicators of accelerant use.

Question 5

In NFPA 921, the 'area of origin' is defined as:

Accepted Answer

A general geographic location within the fire scene where the fire began

Answer

The area of origin is a broader geographic location such as a room or floor where the fire started, distinct from the more precise 'point of origin.'

(RIA) Restoration Industry Association Certified Practice Test

(RIA) Restoration Industry Association Certified Practice Test

RIA NFPA 921 Fire Investigation 3