Washington Category 12 — Fumigation
Pest Control Exam Practice Questions
And Correct Answers (Verified Answers)
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1. Which gas is most commonly used in structural fumigation today?
A. Chlorine
B. Sulfuryl fluoride
C. Ammonia
D. Oxygen
Correct Answer: B. Sulfuryl fluoride
Rationale: Sulfuryl fluoride is widely used due to its effectiveness
against drywood termites and low residue in structures.
2. The primary purpose of fumigation is to:
A. Repel insects
B. Kill pests in a localized area using gases
C. Attract pests for monitoring
, D. Sterilize soil only
Correct Answer: B. Kill pests in a localized area using gases
Rationale: Fumigation uses toxic gases to penetrate materials and
eliminate pests in enclosed spaces.
3. Which pest is commonly targeted in grain fumigation?
A. Termites
B. Beetles
C. Mosquitoes
D. Rodents
Correct Answer: B. Beetles
Rationale: Stored product beetles are common targets in grain
fumigation.
4. Phosphine gas is typically generated from:
A. Liquid propane
B. Aluminum phosphide
C. Sodium chloride
D. Carbon dioxide
Correct Answer: B. Aluminum phosphide
Rationale: Aluminum phosphide reacts with moisture to release
phosphine gas.
5. A major hazard of fumigants is:
A. Low toxicity
B. High odor
, C. High acute toxicity and invisibility
D. Low volatility
Correct Answer: C. High acute toxicity and invisibility
Rationale: Many fumigants are colorless and odorless but highly
toxic.
6. Before fumigation, a structure must be:
A. Painted
B. Fully sealed (tarpaulin or taped)
C. Heated
D. Watered
Correct Answer: B. Fully sealed (tarpaulin or taped)
Rationale: Sealing prevents gas leakage and ensures effective pest
control.
7. Aeration after fumigation is used to:
A. Increase pest activity
B. Remove residual gas safely
C. Seal the structure
D. Add humidity
Correct Answer: B. Remove residual gas safely
Rationale: Aeration clears fumigant gases before reentry.
8. The label on a fumigant product is:
A. Optional guidance
B. A legal document
, C. A suggestion only
D. Marketing material
Correct Answer: B. A legal document
Rationale: The pesticide label is legally enforceable.
9. Which device is used to detect fumigant leaks?
A. Thermometer
B. Gas detector
C. Hygrometer
D. Barometer
Correct Answer: B. Gas detector
Rationale: Gas detectors measure fumigant concentrations in air.
10. The term “dosage” in fumigation refers to:
A. Color of gas
B. Amount of fumigant applied per volume
C. Pest type
D. Wind speed
Correct Answer: B. Amount of fumigant applied per volume
Rationale: Dosage is the calculated amount of fumigant needed for
effectiveness.
11. Sulfuryl fluoride is primarily used for:
A. Soil sterilization only
B. Structural fumigation
C. Water treatment
Pest Control Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A | Instant
Download Pdf
1. Which gas is most commonly used in structural fumigation today?
A. Chlorine
B. Sulfuryl fluoride
C. Ammonia
D. Oxygen
Correct Answer: B. Sulfuryl fluoride
Rationale: Sulfuryl fluoride is widely used due to its effectiveness
against drywood termites and low residue in structures.
2. The primary purpose of fumigation is to:
A. Repel insects
B. Kill pests in a localized area using gases
C. Attract pests for monitoring
, D. Sterilize soil only
Correct Answer: B. Kill pests in a localized area using gases
Rationale: Fumigation uses toxic gases to penetrate materials and
eliminate pests in enclosed spaces.
3. Which pest is commonly targeted in grain fumigation?
A. Termites
B. Beetles
C. Mosquitoes
D. Rodents
Correct Answer: B. Beetles
Rationale: Stored product beetles are common targets in grain
fumigation.
4. Phosphine gas is typically generated from:
A. Liquid propane
B. Aluminum phosphide
C. Sodium chloride
D. Carbon dioxide
Correct Answer: B. Aluminum phosphide
Rationale: Aluminum phosphide reacts with moisture to release
phosphine gas.
5. A major hazard of fumigants is:
A. Low toxicity
B. High odor
, C. High acute toxicity and invisibility
D. Low volatility
Correct Answer: C. High acute toxicity and invisibility
Rationale: Many fumigants are colorless and odorless but highly
toxic.
6. Before fumigation, a structure must be:
A. Painted
B. Fully sealed (tarpaulin or taped)
C. Heated
D. Watered
Correct Answer: B. Fully sealed (tarpaulin or taped)
Rationale: Sealing prevents gas leakage and ensures effective pest
control.
7. Aeration after fumigation is used to:
A. Increase pest activity
B. Remove residual gas safely
C. Seal the structure
D. Add humidity
Correct Answer: B. Remove residual gas safely
Rationale: Aeration clears fumigant gases before reentry.
8. The label on a fumigant product is:
A. Optional guidance
B. A legal document
, C. A suggestion only
D. Marketing material
Correct Answer: B. A legal document
Rationale: The pesticide label is legally enforceable.
9. Which device is used to detect fumigant leaks?
A. Thermometer
B. Gas detector
C. Hygrometer
D. Barometer
Correct Answer: B. Gas detector
Rationale: Gas detectors measure fumigant concentrations in air.
10. The term “dosage” in fumigation refers to:
A. Color of gas
B. Amount of fumigant applied per volume
C. Pest type
D. Wind speed
Correct Answer: B. Amount of fumigant applied per volume
Rationale: Dosage is the calculated amount of fumigant needed for
effectiveness.
11. Sulfuryl fluoride is primarily used for:
A. Soil sterilization only
B. Structural fumigation
C. Water treatment
