ILLINOIS BOF MOD A MIDTERM EXAM AND
PRACTICE EXAM 2026/2027 WITH ACTUAL
CORRECT QUESTIONS AND VERIFIED
DETAILED ANSWERS |CURRENTLY TESTING
QUESTIONS AND SOLUTIONS|ALREADY
GRADED A+|NEWEST |BRAND NEW VERSION!!|
|JUST RELEASED
An oxygen-deficient atmosphere contains less than ____ percent oxygen
19.5%
SCBA cylinders of aluminum steel and carbon fiber must be hydrostatically tested every
___ years
5 years
Which type of breathing apparatus offers protection only for specific known hazards?
Air-Purifying respirator
What is a component of the fire triangle
Heat
Which state must a fuel be in for combustion to take place
Vapor
What is the relationship between resistance and heat as electricity flows through a wire?
As resistance increases, heat increases
Which toxic gas is commonly produced by fire?
1|Page
, hydrogen cyanide
In solid materials, energy moves directly from one molecule to another in which form of
heat transfer?
Conduction
Which term is used interchangeably with flammability range
Explosive limit
What does smoke puffing in and out of a structure indicate?
Backdraft conditions
Which stage of fire results from decreasing oxygen and/or fuel supply
Decay
What is the process of heating a solid so that it liberates gaseous fuel vapors
Pyrolysis
Which form of heat transfer travels in all directions?
Thermal radiation
What is the lowest temperature at which a fuel-air mixture will ignite in the presence of air
and continue to burn
Ignition temperature
A class C fire involves
Energized electrical equipment
The sudden introduction of air into an oxygen-depleted, superheated space may result in
Backdraft
2|Page
PRACTICE EXAM 2026/2027 WITH ACTUAL
CORRECT QUESTIONS AND VERIFIED
DETAILED ANSWERS |CURRENTLY TESTING
QUESTIONS AND SOLUTIONS|ALREADY
GRADED A+|NEWEST |BRAND NEW VERSION!!|
|JUST RELEASED
An oxygen-deficient atmosphere contains less than ____ percent oxygen
19.5%
SCBA cylinders of aluminum steel and carbon fiber must be hydrostatically tested every
___ years
5 years
Which type of breathing apparatus offers protection only for specific known hazards?
Air-Purifying respirator
What is a component of the fire triangle
Heat
Which state must a fuel be in for combustion to take place
Vapor
What is the relationship between resistance and heat as electricity flows through a wire?
As resistance increases, heat increases
Which toxic gas is commonly produced by fire?
1|Page
, hydrogen cyanide
In solid materials, energy moves directly from one molecule to another in which form of
heat transfer?
Conduction
Which term is used interchangeably with flammability range
Explosive limit
What does smoke puffing in and out of a structure indicate?
Backdraft conditions
Which stage of fire results from decreasing oxygen and/or fuel supply
Decay
What is the process of heating a solid so that it liberates gaseous fuel vapors
Pyrolysis
Which form of heat transfer travels in all directions?
Thermal radiation
What is the lowest temperature at which a fuel-air mixture will ignite in the presence of air
and continue to burn
Ignition temperature
A class C fire involves
Energized electrical equipment
The sudden introduction of air into an oxygen-depleted, superheated space may result in
Backdraft
2|Page
