NFPA 921 Exam 1 (2024/2025) | Actual Questions and Answers Latest Updated 2024/2025 (Grade, Exams of Physical anthropology

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NFPA 921 Exam 1 ( 2024 /2025) | Actual Questions and Answers Latest

Updated 2024/2025 (Graded A+)

1033 - ✔✔NFPA _______________ is a standard that is designed to establish the minimum JPRs for service as a fire investigator. Five - ✔✔Most NFPA revision cycles have ________ distinct steps. Deductive Reasoning - ✔✔A process of the fire investigator using his or her own knowledge and skills to challenge or test the hypothesis analytically. Inductive Reasoning - ✔✔The form of reasoning distinguished by the investigator developing a hypothesis based on the empirical data to explain the events of the incident.

1. Recognize the Need
2. Define the Problem
3. Collect Data
4. Analyze the Data
5. Develop a Hypothesis
6. Test the Hypothesis - ✔✔The steps of the Scientific Method Pyrolysis - ✔✔The process of thermal decomposition Pyrolysis - ✔✔________________ is seen when wood, heated sufficiently, breaks down the vapors and char. Vaporization - ✔✔For liquids to burn, they must be heated to produce ignitable mixtures in air through a process known as _______________________.

Combustion - ✔✔For a __________________ to occur, four components must be present. Fuel - ✔✔The material that will be reduced or consumed during the combustion process. Oxidizing Agent - ✔✔Most fires require an __________________ ____________ to support the combustion process. Heat - ✔✔_________________ provides the energy needed to create and ignite vapors produced from the fuel source. Uninhibited Chemical Chain Reaction - ✔✔One element of the fire tetrahedron, this provides for the combination and interaction of the other elements. Thermal Decomposition - ✔✔When an irreversible changes occurs in either solids or liquids, it is called _____________ ____________________. Premixed Burning - ✔✔A flame where the fuel and oxidizer are mixed prior to combustion. Diffusion Flame Burning - ✔✔A flame in which the fuel and air mix together at the region of combustion. Stochiometric Ratio - ✔✔A concentration that exists above the LEL and below the UEL. Heat transfer; energy flow per unit of time - ✔✔Heat energy naturally transferes from areas of higher temperature to low temperatures through a process known as ____________ ___________________; it is measured as ______________________________________. Thermal Inertia - ✔✔Those properties of the material that characterize its rate of surface temperature rise when exposed to heat. Air Entrainment - ✔✔The process of air or gases being drawn into a fire, plume, or jet.

Ohm's Law - ✔✔Basic law of electricity for a resistive circuit Amps - ✔✔=volts/ohms Ohms - ✔✔=volts/amps Overload - ✔✔The persistent operation of equipment in excess of normal, full-power consumption rating or of a conductor in excess of rated ampacity, which would cause damage or dangerous overheating. Overcurrent - ✔✔The temporary excessive flow of current through a conductor Arcs - ✔✔High-temperature discharges across a gap where the conductor is missing. Regulators - ✔✔Pressure _____________________ are attached through the gas supply system to reduce the pressure so that it can be utilized by the appliance or utilization equipment. Combustible gas indicator - ✔✔Used in gas detector surveys and may also and may also detect the presence of other gases Negligence - ✔✔Conduct that falls within the legal standard established to protect others against harm. Demonstrative - ✔✔Evidence that includes any type of tangible evidence such as photographs, diagrams, or charts that is used in court Six - ✔✔How many functions are commonly performed by a fire investigator? Sequential - ✔✔Type of photography that allows the observer of the photograph to better understand the totality of the view and the relationship of the overall surroundings.

Mosaic - ✔✔Photographs that are a series that encompass a large area by overlapping the start of one photo where the previous photograph ended. Artifact - ✔✔The remains of the first fuel ignited, the competent source of ignition that ignited the first fuel, and other materials that influence the fires growth are all examples of ________________ evidence Direct - ✔✔Testimony of witnesses who observe acts or detect something through their five senses and surveillance equipment are both examples of _______________ evidence. Real - ✔✔What type of evidence is classified as a physical or tangible item that tends to prove or disprove a particular fact or issue? Fuel analysis - ✔✔The form and geometry of the initial fuel must be such that the ignition source is capable of generating and transferring sufficient heat energy over the allowed time to result in ignition. Identification of this information is known as: Estimated - ✔✔An approximation based on information or calculations that may or may not be relative to other events or activities is classified as _________________ times. Mathematical - ✔✔In regards to modeling classification, a flammable gas concentration calculated on a hand calculator to determine the upper and lower explosive limits for a given gas in a given space would be an example of a(n) ____ model. Firebrands - ✔✔Hot or burning fragments propelled from an explosion are referred to as Mechanical - ✔✔What type of explosions do not involve changes in the basic chemical nature of the substance(s) in a vessel? Motion - ✔✔An appliance switch that is considered a "tip over" switch is classified as a ____ switch.

Aluminum - ✔✔____ housings are generally made from formed sheets or castings Fohen - ✔✔____ winds are the result of air flowing between pressure gradients. Diurnal - ✔✔A wind that is the effect of air being heated by the sun during the day and then cooled during the night is a ____ wind. Interested Party - ✔✔A(n) ____ is any person, entity, or organization, including their representatives, with statutory obligations or whose legal rights or interests may be affected by the investigation of a specific incident. Work Plan - ✔✔A ____ is an outline of the tasks to be completed and includes the order and timeline for completion Custodian - ✔✔An evidence ____ is designated to manage all aspects of the evidence handling in a complex investigation. Protocol - ✔✔The removing of evidence in a complex investigation should be addressed in the ____ early in the investigation. Overfusing - ✔✔A dangerous condition that occurs when the circuit protection rating significantly exceeds the ampacity of the conductor, leading to a condition in which increased heat can occur in the conductors. amperage - ✔✔The amount of current flow measured in amperes Bracketing - ✔✔Taking a series of photos with sequentially adjusted exposures. Diagrams - ✔✔Formal drawings that are completed after the scene investigation is completed

Photo Painting - ✔✔A technique used when the photo will cover a large scene. It can be accomplished by placing the camera in a fixed position with the shutter locked open. Ring Flash - ✔✔Reduces glare and gives adequate lighting for the subject matter. Sketches - ✔✔Freehand diagrams or diagrams drawn with minimal tools that are completed at the scene and can be either three or two dimensional. Direct Evidence - ✔✔Testimony of witnesses who observe acts or detect something through their five senses Circumstantial Evidence - ✔✔Facts that usually attend other facts to be proven and are drawn by logical inference from them Inverted Cone - ✔✔Which type of burn patter is created from a short-lived fire or one that involved a fuel package of low heat release? Saddle Burns - ✔✔Type of burn found most often on top of floor joists?