NFPA 921 EXAM LATEST 2025 WITH CORRECT
QUESTIONS AND DETAILED ANSWERS/ALREADY
GRADED A+
One Coulomb - CORRECT ANSWER-6.24 x 10(18) electrons
A BTU is equal to? - CORRECT ANSWER-1055 joules
1.055 kilojoules
252.15 calories
1 Calorie equals how many Joules? - CORRECT ANSWER-4.184 joules
How many Calories in a BTU? - CORRECT ANSWER-252.15 calories
7 Step Scientific Method - CORRECT ANSWER-Recognize the need (identify the
problem)
Define the Problem
Collect Data
,Analyze the Data
Develop Hypothesis (inductive reasoning)
Test the Hypothesis (deductive reasoning)
Select Final Hypothesis
Deductive reasoning - CORRECT ANSWER-Test the hypothesis.
Two Levels of Certainty - CORRECT ANSWER-Probable
Possible
Probable Certainty - CORRECT ANSWER-More likely true than not. The
likelihood of the hypothesis being true is greater than 50 percent.
Inductive reasoning - CORRECT ANSWER-Develop a hypothesis.
Expectation Bias - CORRECT ANSWER-Investigators reach a premature
conclusion without having examined or considered all of the relevant data.
Confirmation Bias - CORRECT ANSWER-Investigator relies exclusively on data
that supports the hypothesis and fails to look for, ignores, or dismisses
contradictory or nonsupporting data.
, Possible Certainty - CORRECT ANSWER-The hypothesis can be demonstrated to
be feasible but cannot be declared probable. If two or more hypothesis are
equally likely, then the level of certainty must be "possible."
Flammable Range of Hydrogen - CORRECT ANSWER-71 percent (4% to 75%)
Thermal Conductivity (k) - CORRECT ANSWER-A measure of the amount of heat
that will flow across a unit area with a temperature gradient of 1 degree per unit
of length (W/m-K, Btu/hr-ft-F).
Heat Capacity (c)(specific heat) - CORRECT ANSWER-A measure of the amount
of heat necessary to raise the temperature of a unit of mass 1 degree, under
specific conditions (J/kg-K, Btu/lb-F).
Normal Ambient Temperature - CORRECT ANSWER-20 C, (68 F)
Thermal Inertia - CORRECT ANSWER-A measure of how easy the surface
temperature of the material will increase when heat flows into the material.
(conductivity(k) x density(p) x heat capacity(c)).
Empirical Temperature Scale - CORRECT ANSWER-Fahrenheit and Celsius
Absolute Zero in Fahrenheit - CORRECT ANSWER--459.67
QUESTIONS AND DETAILED ANSWERS/ALREADY
GRADED A+
One Coulomb - CORRECT ANSWER-6.24 x 10(18) electrons
A BTU is equal to? - CORRECT ANSWER-1055 joules
1.055 kilojoules
252.15 calories
1 Calorie equals how many Joules? - CORRECT ANSWER-4.184 joules
How many Calories in a BTU? - CORRECT ANSWER-252.15 calories
7 Step Scientific Method - CORRECT ANSWER-Recognize the need (identify the
problem)
Define the Problem
Collect Data
,Analyze the Data
Develop Hypothesis (inductive reasoning)
Test the Hypothesis (deductive reasoning)
Select Final Hypothesis
Deductive reasoning - CORRECT ANSWER-Test the hypothesis.
Two Levels of Certainty - CORRECT ANSWER-Probable
Possible
Probable Certainty - CORRECT ANSWER-More likely true than not. The
likelihood of the hypothesis being true is greater than 50 percent.
Inductive reasoning - CORRECT ANSWER-Develop a hypothesis.
Expectation Bias - CORRECT ANSWER-Investigators reach a premature
conclusion without having examined or considered all of the relevant data.
Confirmation Bias - CORRECT ANSWER-Investigator relies exclusively on data
that supports the hypothesis and fails to look for, ignores, or dismisses
contradictory or nonsupporting data.
, Possible Certainty - CORRECT ANSWER-The hypothesis can be demonstrated to
be feasible but cannot be declared probable. If two or more hypothesis are
equally likely, then the level of certainty must be "possible."
Flammable Range of Hydrogen - CORRECT ANSWER-71 percent (4% to 75%)
Thermal Conductivity (k) - CORRECT ANSWER-A measure of the amount of heat
that will flow across a unit area with a temperature gradient of 1 degree per unit
of length (W/m-K, Btu/hr-ft-F).
Heat Capacity (c)(specific heat) - CORRECT ANSWER-A measure of the amount
of heat necessary to raise the temperature of a unit of mass 1 degree, under
specific conditions (J/kg-K, Btu/lb-F).
Normal Ambient Temperature - CORRECT ANSWER-20 C, (68 F)
Thermal Inertia - CORRECT ANSWER-A measure of how easy the surface
temperature of the material will increase when heat flows into the material.
(conductivity(k) x density(p) x heat capacity(c)).
Empirical Temperature Scale - CORRECT ANSWER-Fahrenheit and Celsius
Absolute Zero in Fahrenheit - CORRECT ANSWER--459.67
