PracticeVideosBlogFlashcardsEspañol
All Practice Exams

100+ Free NC Phase F Practice Questions

North Carolina Structural Pest Control - Fumigation (Phase F) practice questions are available now; exam metadata is being verified.

✓ No registration✓ No credit card✓ No hidden fees✓ Start practicing immediately
100+ Questions
100% Free

Loading practice questions...

Same family resources

Explore More Structural Pest Control Licenses

Continue into nearby exams from the same family. Each card keeps practice questions, study guides, flashcards, videos, and articles in one place.

California Structural Pest Control — Branch 1 Fumigation

Practice Questions

California Structural Pest Control — Branch 2 General Pest

Practice Questions

California Structural Pest Control — Branch 3 Wood-Destroying Organisms

Practice Questions

Florida Structural Pest Control — Fumigation Category

Practice Questions

Florida Structural Pest Control — General Household Pest

Practice Questions

Florida Structural Pest Control — Lawn & Ornamental

Practice Questions
2026 Statistics

Key Facts: NC Phase F Exam

100

Practice Questions

OpenExamPrep

70%

Passing Score

NCDA&CS

1 ppm

Sulfuryl Fluoride Reentry Level

EPA

5 ppm

OSHA PEL (8-hr TWA)

OSHA

$53

Per Phase Exam Attempt

NCDA&CS

Phase F

Fumigation Phase

NC Structural Pest Control Act

North Carolina's Phase F (Fumigation) certification, administered by the NCDA&CS Structural Pest Control & Pesticides Division, authorizes the use of lethal fumigant gases such as sulfuryl fluoride (Vikane) to treat whole structures. The NC Structural Pest Control Act recognizes three phases - P (household pests), W (wood-destroying organisms), and F (fumigation). To certify, candidates complete registered-technician requirements and pass the Core (general standards) exam plus the Phase F category exam, each at 70%; phase exam attempts cost $53. The work centers on tarping and sealing, dosage and half-loss time, the 1 ppm reentry clearance level, SCBA use, DANGER posting, and aeration. This free prep includes 100 research-based practice questions with explanations and an AI tutor.

Sample NC Phase F Practice Questions

Try these sample questions to test your NC Phase F exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Sulfuryl fluoride (the active ingredient in Vikane) is best described physically as a gas that is:
A.Bright yellow with a sharp, sweet odor
B.Colorless and odorless
C.A heavy white vapor visible at room temperature
D.A blue liquid that boils on release
Explanation: Sulfuryl fluoride is a colorless, odorless gas at normal temperatures. Because it gives no sensory warning of its presence, a chloropicrin warning agent is released into the structure first and clearance must be confirmed with a gas-detection (clearance) device rather than by smell.
2Why is chloropicrin introduced into a structure before or with the primary fumigant in many structural fumigations?
A.It is the actual fumigant that kills the pests
B.It serves as a warning agent (lachrymator) because the primary fumigant is odorless
C.It speeds the chemical breakdown of the fumigant
D.It neutralizes the fumigant after the exposure period
Explanation: Chloropicrin is a lachrymator (tear gas) added as a warning agent because fumigants such as sulfuryl fluoride and methyl bromide are odorless and give no warning of dangerous concentrations. The eye and respiratory irritation it causes warns people to leave; it is not the killing agent.
3Under federal requirements, a structure fumigated with sulfuryl fluoride may not be reoccupied until the in-air concentration is confirmed at or below:
A.100 ppm
B.5 ppm
C.1 ppm
D.25 ppm
Explanation: The reentry (clearance) level for sulfuryl fluoride is 1 ppm. A clearance device must read 1 ppm or less in the breathing zone of each room before people may return. The 5 ppm value is the OSHA 8-hour PEL, not the reentry standard.
4Which of the following is the correct OSHA permissible exposure limit (PEL) for sulfuryl fluoride as an 8-hour time-weighted average?
A.1 ppm
B.5 ppm
C.50 ppm
D.0.1 ppm
Explanation: OSHA sets the PEL for sulfuryl fluoride at 5 ppm as an 8-hour time-weighted average. The 1 ppm figure is the reentry/clearance level the public must not exceed, which is more conservative than the worker PEL.
5In North Carolina's structural pest control program, the license phase that covers fumigation is designated:
A.Phase P
B.Phase W
C.Phase F
D.Phase R
Explanation: North Carolina recognizes three phases of structural pest control: Phase P (household pests by means other than fumigation), Phase W (wood-destroying organisms by means other than fumigation), and Phase F (fumigation). Fumigation is Phase F.
6A device used at the end of the exposure and aeration period to confirm that the sulfuryl fluoride concentration has dropped to a safe level is called a:
A.Manometer
B.Clearance device (gas analyzer)
C.Anemometer
D.Hygrometer
Explanation: A clearance device (portable gas analyzer) measures sulfuryl fluoride down to the 1 ppm reentry level in the breathing zone of each room. EPA requires this verification before posting clearance and allowing reoccupancy; the applicator cannot rely on time or odor alone.
7The instrument commonly used during the exposure period to monitor sulfuryl fluoride concentration and confirm adequate gas accumulation inside the tarped structure is the:
A.Fumiscope
B.Bourdon gauge
C.Sling psychrometer
D.Spectrophotometer
Explanation: A Fumiscope (a thermal-conductivity gas-detection instrument) is used to monitor sulfuryl fluoride concentration during the exposure period to verify the dosage has accumulated and is holding. Readings help determine the half-loss time of the structure.
8The half-loss time (HLT) of a structure being fumigated refers to:
A.The time for the fumigant to reach lethal concentration
B.The time for one-half of the initial gas concentration to be lost from the structure
C.Half the total exposure period required by the label
D.The time needed to aerate to 1 ppm
Explanation: Half-loss time (HLT) is the time required for one-half of the initial sulfuryl fluoride concentration to escape the sealed structure. A short HLT means the structure leaks badly and needs a higher dosage to maintain a lethal concentration-time product through the exposure period.
9Which combination of factors most directly determines the Vikane (sulfuryl fluoride) dosage for a structural fumigation?
A.Paint color, roof pitch, and lot size
B.Temperature, exposure time, target pest/egg stage, and the structure's half-loss time
C.Number of windows and the homeowner's budget
D.Wind speed and soil pH only
Explanation: Label dosage is calculated from the soil/slab temperature, the exposure (fumigation) period, the pest and life stage to be controlled (eggs need more), and the structure's half-loss time. These feed the concentration-time (Ct) product needed for a kill.
10Sulfuryl fluoride is a relatively poor ovicide. The practical consequence for fumigation is that:
A.Eggs are easier to kill than adults, so dosage can be reduced
B.A higher dosage and/or longer exposure is needed when egg-stage pests (e.g., drywood termite eggs) must be controlled
C.Eggs cannot be controlled at all, so fumigation is pointless
D.Temperature has no effect on egg control
Explanation: Insect eggs are more tolerant to sulfuryl fluoride than active stages, so the label requires a higher concentration-time product (more gas and/or longer exposure) when eggs must be killed. Warmer temperatures increase egg respiration and improve control.

About the NC Phase F Practice Questions

Verified exam format metadata for North Carolina Structural Pest Control - Fumigation (Phase F) is pending. The practice questions above remain available while official exam length, timing, passing score, fee, and administrator details are reviewed.