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.
A customer asks an applicator to control aphids on ornamental roses and vegetables in separate beds. The insecticide on the truck lists aphids and ornamental plants, but no edible crops; no supplemental labeling authorizes food-crop use. Which response correctly applies the site restriction?
Correct answer: B - Treat the roses; select an authorized control approach for the vegetables.
Under comparable acute oral toxicity tests, Product X has an LD50 of 80 mg/kg and Product Y has an LD50 of 1,600 mg/kg. A supervisor wants to use these results to compare the products. What can these values establish?
Correct answer: D - Product X is more acutely toxic by ingestion; task-specific risk also depends on exposure.
A ground-spray label permits application at wind speeds of 3-10 mph and prohibits spraying during a temperature inversion. At dawn, wind is 1 mph and smoke hangs in a low horizontal layer. By late morning, wind is steady at 5 mph away from sensitive areas and smoke disperses upward. Afternoon winds reach 12 mph. Which scheduling decision fits these observations?
Correct answer: A - Use the late-morning window while those conditions persist.
Liquid pesticide splashes into a handler's eye. The handler is alert, is wearing contact lenses, and has immediate access to clean running water. The portable saline eyewash bottle is empty. What should happen first?
Correct answer: C - Begin gentle water irrigation for 15-20 minutes; remove contacts after five minutes and continue rinsing.
Two pesticide containers show the same EPA establishment number but different EPA registration numbers. A crew member assumes that either container's label can be used for both products. Why is that assumption unsound?
Correct answer: A - The establishment number identifies the producing facility, not interchangeable product directions.
A hose from a drinking-water supply is submerged in pesticide mixture while a spray tank is being filled. The supply line has no backflow preventer. Which change protects the water supply if its pressure suddenly falls?
Correct answer: D - Secure the hose above the overflow rim, maintaining an effective air gap.
A proposed treatment site has sandy soil, little organic matter, and shallow groundwater. Four equally effective pesticides would be applied at comparable rates. Their properties were measured under comparable conditions. Koc is the soil organic-carbon adsorption coefficient. Which profile presents the greatest leaching concern?
Correct answer: B - Water solubility: 800 mg/L; Koc: 40; soil half-life: 90 days.
A 4-acre block has already received 4.25 quarts of one pesticide per acre this season. Its label allows 1-2 quarts per acre per application and a seasonal maximum of 6 quarts per acre. The retreatment interval has elapsed, and 1.5 quarts per acre will control the current infestation. Which plan delivers that treatment without exceeding either maximum?
Correct answer: C - Apply 6 quarts over the block at 1.5 quarts per acre.
On a hot afternoon, an applicator handling an organophosphate insecticide develops headache, nausea, and heavy sweating. Work stops and medical help is requested. Which additional finding would most strongly favor pesticide poisoning over heat exhaustion?
Correct answer: D - Excessive salivation with unusually small pupils.
Undiluted pesticide with the signal word WARNING saturates a greenhouse handler's cotton coveralls. The handler has removed the clothing, decontaminated the skin, and changed into clean clothes. How must the employer handle the saturated coveralls?
Correct answer: B - Discard the coveralls and follow applicable rules for pesticide waste disposal.
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