IICRC FSRT Fire and Smoke Restoration Technician
Exam Practice Questions & Correct Detailed Answers
Latest Update 2026 (Guaranteed A+ Guide)
Question
Which chemical contains living bacteria which digests decaying protein
contaminants such as urine, blood, etc.?
A. Oxidizing agent
B. Enzyme deodorant
C. Masking agent
D. Pairing agent - VERIFIED ANSWER- B. Enzyme deodorant
Rationale: Enzyme deodorants contain beneficial bacteria that produce
enzymes to digest organic protein-based soils and odors.
Question
Most odor control agents contain a combination of _______ and __________
agents.
A. Masking and pairing
B. Cleaning and drying
C. Wetting and drying
D. Heating and cooling - VERIFIED ANSWER- A. Masking and pairing
Rationale: Effective odor control products typically combine masking agents
(cover odors) with pairing agents (chemically combine with odors).
Question
The chemical symbol of ___________ is O3.
A. Oxygen
B. Ozone gas
C. Hydrogen peroxide
,D. Hydroxyl - VERIFIED ANSWER- B. Ozone gas
Rationale: Ozone (O3) is a gaseous oxidizing agent used in odor control that
chemically breaks down odor molecules.
Question
Insure safe chemical concentrations by utilizing a ________ cup.
A. Measuring
B. Coffee
C. Plastic
D. Paper - VERIFIED ANSWER- A. Measuring
Rationale: Proper measuring ensures correct chemical concentrations for
both safety and effectiveness.
Question
When using a thermal fogger, safety concerns include:
A. Only respiratory irritation
B. Open flame explosion, oil residue, respiratory irritant
C. Only slippery residues
D. Only electrical hazards - VERIFIED ANSWER- B. Open flame explosion, oil
residue, respiratory irritant
Rationale: Thermal foggers use heat to create fog and present multiple
hazards including fire/explosion risk, slippery surfaces from oil-based
products, and respiratory concerns.
Question
A thermal fogger can produce a molecule size of:
A. 8 - 15 microns
B. 20 - 30 microns
C. .5 - 2 microns
D. 50 - 100 microns - VERIFIED ANSWER- C. .5 - 2 microns
Rationale: Thermal foggers produce extremely small particles (0.5-2 microns)
that can penetrate deep into porous materials.
,Question
A ULV fogger can produce a molecule size of:
A. .5 - 2 microns
B. 8 - 15 microns
C. 20 - 30 microns
D. 50 - 100 microns - VERIFIED ANSWER- B. 8 - 15 microns
Rationale: Ultra-Low Volume (ULV) foggers produce larger droplets (8-15
microns) that remain airborne longer for space treatment.
Question
A hydroxyl generator utilizes _____ light and _________ to create hydroxyl
radicals.
A. Infrared, heat
B. Ultraviolet light, moisture
C. Visible, oxygen
D. Laser, hydrogen - VERIFIED ANSWER- B. Ultraviolet light, moisture
Rationale: Hydroxyl generators combine UV light with ambient moisture to
produce hydroxyl radicals that oxidize and destroy odors.
Question
When working for a client who is chemically sensitive, it may require:
A. AFD, special cleaning agents/procedures, special deodorizing, signed
consent form of product use
B. Only extra ventilation
C. Only masking agents
D. Only shorter work hours - VERIFIED ANSWER- A. AFD, special cleaning
agents/procedures, special deodorizing, signed consent form of product
use
Rationale: Chemically sensitive clients require comprehensive
accommodations including air filtration, specialized products, and informed
consent documentation.
, Question
When deodorizing, the treated area must be:
A. Kept warm
B. Vacated by persons without respiratory protection
C. Well lit
D. Open to traffic - VERIFIED ANSWER- B. Vacated by persons without
respiratory protection
Rationale: Deodorization chemicals can be harmful, so areas must be cleared
of unprotected persons during treatment.
Question
Odors are amplified by:
A. Temperature and humidity/moisture
B. Light and sound
C. Pressure and vacuum
D. Time and distance - VERIFIED ANSWER- A. Temperature and
humidity/moisture
Rationale: Higher temperatures and humidity levels increase the volatility and
perception of odors.
Question
What are the 3 basic components of a fire?
A. Fuel, Heat, Smoke
B. Fuel, Heat, Oxygen
C. Oxygen, Smoke, Heat
D. Fuel, Oxygen, Carbon - VERIFIED ANSWER- B. Fuel, Heat, Oxygen
Rationale: The fire triangle consists of three essential elements: fuel
Exam Practice Questions & Correct Detailed Answers
Latest Update 2026 (Guaranteed A+ Guide)
Question
Which chemical contains living bacteria which digests decaying protein
contaminants such as urine, blood, etc.?
A. Oxidizing agent
B. Enzyme deodorant
C. Masking agent
D. Pairing agent - VERIFIED ANSWER- B. Enzyme deodorant
Rationale: Enzyme deodorants contain beneficial bacteria that produce
enzymes to digest organic protein-based soils and odors.
Question
Most odor control agents contain a combination of _______ and __________
agents.
A. Masking and pairing
B. Cleaning and drying
C. Wetting and drying
D. Heating and cooling - VERIFIED ANSWER- A. Masking and pairing
Rationale: Effective odor control products typically combine masking agents
(cover odors) with pairing agents (chemically combine with odors).
Question
The chemical symbol of ___________ is O3.
A. Oxygen
B. Ozone gas
C. Hydrogen peroxide
,D. Hydroxyl - VERIFIED ANSWER- B. Ozone gas
Rationale: Ozone (O3) is a gaseous oxidizing agent used in odor control that
chemically breaks down odor molecules.
Question
Insure safe chemical concentrations by utilizing a ________ cup.
A. Measuring
B. Coffee
C. Plastic
D. Paper - VERIFIED ANSWER- A. Measuring
Rationale: Proper measuring ensures correct chemical concentrations for
both safety and effectiveness.
Question
When using a thermal fogger, safety concerns include:
A. Only respiratory irritation
B. Open flame explosion, oil residue, respiratory irritant
C. Only slippery residues
D. Only electrical hazards - VERIFIED ANSWER- B. Open flame explosion, oil
residue, respiratory irritant
Rationale: Thermal foggers use heat to create fog and present multiple
hazards including fire/explosion risk, slippery surfaces from oil-based
products, and respiratory concerns.
Question
A thermal fogger can produce a molecule size of:
A. 8 - 15 microns
B. 20 - 30 microns
C. .5 - 2 microns
D. 50 - 100 microns - VERIFIED ANSWER- C. .5 - 2 microns
Rationale: Thermal foggers produce extremely small particles (0.5-2 microns)
that can penetrate deep into porous materials.
,Question
A ULV fogger can produce a molecule size of:
A. .5 - 2 microns
B. 8 - 15 microns
C. 20 - 30 microns
D. 50 - 100 microns - VERIFIED ANSWER- B. 8 - 15 microns
Rationale: Ultra-Low Volume (ULV) foggers produce larger droplets (8-15
microns) that remain airborne longer for space treatment.
Question
A hydroxyl generator utilizes _____ light and _________ to create hydroxyl
radicals.
A. Infrared, heat
B. Ultraviolet light, moisture
C. Visible, oxygen
D. Laser, hydrogen - VERIFIED ANSWER- B. Ultraviolet light, moisture
Rationale: Hydroxyl generators combine UV light with ambient moisture to
produce hydroxyl radicals that oxidize and destroy odors.
Question
When working for a client who is chemically sensitive, it may require:
A. AFD, special cleaning agents/procedures, special deodorizing, signed
consent form of product use
B. Only extra ventilation
C. Only masking agents
D. Only shorter work hours - VERIFIED ANSWER- A. AFD, special cleaning
agents/procedures, special deodorizing, signed consent form of product
use
Rationale: Chemically sensitive clients require comprehensive
accommodations including air filtration, specialized products, and informed
consent documentation.
, Question
When deodorizing, the treated area must be:
A. Kept warm
B. Vacated by persons without respiratory protection
C. Well lit
D. Open to traffic - VERIFIED ANSWER- B. Vacated by persons without
respiratory protection
Rationale: Deodorization chemicals can be harmful, so areas must be cleared
of unprotected persons during treatment.
Question
Odors are amplified by:
A. Temperature and humidity/moisture
B. Light and sound
C. Pressure and vacuum
D. Time and distance - VERIFIED ANSWER- A. Temperature and
humidity/moisture
Rationale: Higher temperatures and humidity levels increase the volatility and
perception of odors.
Question
What are the 3 basic components of a fire?
A. Fuel, Heat, Smoke
B. Fuel, Heat, Oxygen
C. Oxygen, Smoke, Heat
D. Fuel, Oxygen, Carbon - VERIFIED ANSWER- B. Fuel, Heat, Oxygen
Rationale: The fire triangle consists of three essential elements: fuel
