10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
The OR-PEST exam has 100 questions and runs 2 hours.
These 10 free OR-PEST questions are organized by exam domain, so you can see how each part of the Oregon Pesticide Laws and Safety Exam blueprint is tested. Reveal the answer and explanation under each question.
Domain 1: Label comprehension
Question 1
Two insecticides are applied simultaneously to a labeled orchard block at 6:00 a.m. Product A has a 12-hour restricted-entry interval (REI) and a 7-day preharvest interval (PHI); Product B has a 24-hour REI and a 3-day PHI. No early-entry exception applies. At 10:00 a.m. the next day, a worker is scheduled to scout without early-entry PPE, and harvest is scheduled 4 days after application. Which statement is correct?
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Correct answer: C - Scouting may proceed; harvest must wait for Product A's 7-day PHI.
Question 2
A herbicide label lists the crop but not a newly identified weed. The applicator proposes a rate 20% below the label maximum using a ground method not prohibited by the label. The label contains no statement forbidding treatment of unlisted pests, and no Oregon restriction adds a conflict. Which conclusion is best?
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Correct answer: A - Section 2(ee) allows it if every other label restriction is followed.
Question 3
A herbicide label requires medium or coarser droplets and a spray volume of 10-20 gallons per acre (GPA). The applicator wants 15 GPA at 5 mph with 20-inch nozzle spacing. Using GPM = (GPA × mph × nozzle spacing in inches) ÷ 5,940, which nozzle selection meets both the target output and the droplet restriction?
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Correct answer: D - 0.25 GPM, medium droplets
Domain 2: Protective clothing and equipment
Question 4
While mixing a pesticide, the label requires protection from both organic vapors and particulates. Oxygen is normal, the contaminant and concentration are known, and the atmosphere is not immediately dangerous to life or health. Which respirator configuration addresses both hazards?
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Correct answer: B - An elastomeric APR with organic-vapor cartridges and particulate filters
Question 5
After prolonged work in high heat, a handler wearing chemical-resistant coveralls and a respirator develops heavy sweating, weakness, headache, and cool, clammy skin. There was no known pesticide splash; the handler is alert, speaking normally, and able to swallow. What is the best immediate response?
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Correct answer: A - Stop work, move to shade, safely remove excess PPE, cool, and offer fluids.
Domain 3: First aid and toxicity
Question 6
Minutes after an organophosphate splash, a mixer develops pinpoint pupils, profuse salivation, vomiting, wheezing with heavy secretions, and muscle fasciculations. Which response is most appropriate?
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Correct answer: D - Call 911, decontaminate safely, and give the label to EMS.
Question 7
A concentrated pesticide splashes into a handler's eye. The label directs rinsing for 15-20 minutes and removal of contact lenses after the first 5 minutes. The handler is wearing a contact lens. Which sequence follows the label?
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Correct answer: B - Begin rinsing at once, remove the lens after 5 minutes, then continue rinsing.
Question 8
Acute testing of a formulated pesticide shows an oral LD50 of 120 mg/kg, a dermal LD50 of 4,500 mg/kg, an inhalation LC50 of 6 mg/L, moderate eye irritation with no corneal opacity that resolves within 4 days, and mild skin irritation. Assuming no more severe endpoint, which signal word belongs on the front panel?
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Correct answer: C - WARNING
Domain 4: Federal and State laws and regulations
Question 9
A landscaping company contracts to apply pesticides on clients' properties for compensation. Its lead technician has passed Laws and Safety plus every category used by the company. Which company/technician license pairing matches those roles?
A new employee has passed only the Laws and Safety exam and has obtained the corresponding Oregon license. The supervising applicator holds the needed categories and remains reachable by phone throughout the job but is not at the application site. Which role fits this arrangement?