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Free PAC Practice Questions

10 free, exam-style Pesticide Applicator Certification (Core Exam) (PAC) practice questions with answers and explanations. No signup required. Work through them below, then take the full free PAC practice test to study every exam domain.

These 10 free PAC questions are organized by exam domain, so you can see how each part of the Pesticide Applicator Certification (Core Exam) blueprint is tested. Reveal the answer and explanation under each question.

Domain 3: Pesticides in the Environment

Question 1

An applicator notices smoke from a nearby chimney rising about 10 feet then flattening and drifting sideways. This indicates:

  1. Ideal spraying conditions with good air mixing
  2. A temperature inversion that makes spraying conditions unsafe
  3. High wind conditions requiring higher spray pressure
  4. Normal convection currents that will disperse spray
Show answer & explanation

Correct answer: B - A temperature inversion that makes spraying conditions unsafe

Question 2

Why are microencapsulated insecticide formulations particularly hazardous to honey bees?

  1. The capsules dissolve rapidly on contact with bee exoskeletons causing immediate toxicity
  2. Bees collect the capsules and carry them back to the hive, exposing the entire colony
  3. Microencapsulated formulations persist longer on flowers extending the exposure window
  4. The slow-release mechanism delivers a higher cumulative dose than other formulation types
Show answer & explanation

Correct answer: B - Bees collect the capsules and carry them back to the hive, exposing the entire colony

Question 3

Which combination of factors creates the HIGHEST risk for pesticide leaching to groundwater?

  1. Clay soil, deep water table, low-solubility pesticide
  2. Sandy soil, shallow water table, high-solubility pesticide with long half-life
  3. Loam soil, moderate water table, short half-life pesticide
  4. Rocky soil, deep water table, volatile pesticide
Show answer & explanation

Correct answer: B - Sandy soil, shallow water table, high-solubility pesticide with long half-life

Domain 4: Pest Management

Question 4

The Action Threshold (Economic Threshold) is set BELOW the Economic Injury Level because:

  1. Treatment is more cost-effective when applied at lower pest population levels
  2. It allows time for the treatment to take effect before economic damage occurs
  3. A lower threshold ensures the maximum amount of pesticide can be applied
  4. The Action Threshold and Economic Injury Level are actually identical values
Show answer & explanation

Correct answer: B - It allows time for the treatment to take effect before economic damage occurs

Question 5

An applicator finds that tilling a field infested with nutsedge has made the problem worse. This is because:

  1. Tilling compacts the soil, favoring nutsedge
  2. Tilling broke apart the tubers and rhizomes, each piece generating a new plant
  3. Nutsedge is immune to soil disturbance
  4. Tilling increased soil moisture to levels that suppress nutsedge growth
Show answer & explanation

Correct answer: B - Tilling broke apart the tubers and rhizomes, each piece generating a new plant

Domain 5: Pesticide Formulations and Mixing

Question 6

When comparing formulation types, which statement is CORRECT?

  1. Granules present the highest inhalation hazard due to their fine particle size distribution
  2. Wettable powders have the highest dermal absorption risk because they remain on the skin
  3. ECs have the highest dermal absorption risk and dusts have the highest drift hazard
  4. Solutions carry the greatest environmental contamination risk of any common formulation type
Show answer & explanation

Correct answer: C - ECs have the highest dermal absorption risk and dusts have the highest drift hazard

Question 7

A dog owner is concerned because their pet ate a rodent that had consumed anticoagulant bait. The veterinarian would most likely treat the dog with:

  1. Antibiotics
  2. Atropine
  3. Vitamin K1 therapy
  4. Stomach pumping only
Show answer & explanation

Correct answer: C - Vitamin K1 therapy

Domain 6: Application Equipment and Calibration

Question 8

An applicator uses a sprayer that previously held an herbicide and now wants to apply an insecticide to vegetable crops. Without thorough cleaning, the PRIMARY risk is:

  1. The insecticide will not work properly
  2. Herbicide residue in the system could injure or kill the vegetable crops
  3. The vegetables will taste like the herbicide
  4. There is no risk if the products are made by the same manufacturer
Show answer & explanation

Correct answer: B - Herbicide residue in the system could injure or kill the vegetable crops

Question 9

To DOUBLE the output of a nozzle by changing pressure alone, you must:

  1. Double the pressure
  2. Triple the pressure
  3. Quadruple the pressure
  4. Increase pressure by 50%
Show answer & explanation

Correct answer: C - Quadruple the pressure

Domain 7: Application Procedures and Drift Management

Question 10

To reduce BOTH spray drift and vapor drift when applying near sensitive areas, an applicator should:

  1. Apply during the hottest part of the day with fine droplets
  2. Use drift-reduction nozzles with large droplets AND select low-volatility formulations
  3. Apply at maximum pressure for faster coverage
  4. Apply early in the morning when temperatures and wind speeds are both at their highest
Show answer & explanation

Correct answer: B - Use drift-reduction nozzles with large droplets AND select low-volatility formulations

The rest of the PAC blueprint

The PAC exam also covers these domains. Drill them in the full free practice test:

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