AERIAL APPLICATION PRACTICE EXAM 2025/2026
QUESTIONS AND ANSWERS GRADED A+
✔✔12. The addition of a small amount of a surfactant and/or a wetting agent to a spray
mix may result in the following change in surface tension of the spray mix:
a. No change in surface tension will occur.
b. Surface tension will decrease.
c. Surface tension will increase.
d. None of the above. - ✔✔b. Surface tension will decrease
✔✔13. At a constant temperature, diesel fuel and vegetable oil have surface tensions
that are:
a. The same as that of water.
b. Greater than that of water
c. Less than that of water.
d. None of the above. - ✔✔c. Less than that of water
✔✔14. The surface tension of liquids __________.
a. Increases with increases in temperature.
b. Is independent of changes in temperature.
c. Decreases with increases in temperature.
d. None of the above. - ✔✔c. Decreases with increases in temperature
✔✔15. Surface tension (dynes/cm at 20 degrees C or 68 degrees F) for water is
__________ xylene, diesel fuel and cottonseed oil.
a. Greater than.
b. Same as.
c. Less than.
d. None of the above. - ✔✔a. Greater than
✔✔16. __________ is a measure of the capacity of a substance to evaporate.
a. Viscosity.
b. Vapor pressure.
c. Surface tension.
d. All of the above. - ✔✔b. Vapor pressure
✔✔17. What change in the vapor pressure of liquids might be expected when the
temperature changes?
a. Vapor pressure is independent of changes in temperature.
b. Vapor pressure decreases as temperature increases.
c. Vapor pressure increases as temperature increases.
d. None of the above. - ✔✔c. Vapor pressure increases as temperature increases
, ✔✔18. 2,4-D herbicide formulations are commonly referred to as "high volatile", "low
volatile", and "nonvolatile". Non-volatile formulations may vaporize on very hot days.
a. True
b. False - ✔✔a. True
✔✔19. The density of water is __________ than that of diesel fuel and cottonseed oil.
a. Greater.
b. Less.
c. Same as.
d. None of the above. - ✔✔a. Greater
✔✔20. Droplets having the same size but of a less dense liquid will fall __________
than a more dense liquid.
a. Faster.
b. Slower.
c. At the same rate.
d. Must know the temperature to answer. - ✔✔b. Slower
✔✔Application equipment related factors having major effect on droplet size are:
a. Nozzle and nozzle orientation
b. Spray pressure and air speed
c. Boom selection and position
d. All of the above - ✔✔All of the above
✔✔When selecting boom types to get the most effective swath patterns, round booms
are always better than airfoil type booms.
a. True
b. False - ✔✔False
✔✔Small water droplets fall faster than large water droplets.
a. True
b. False - ✔✔False
✔✔Small water droplets fall slower than large water droplets, so are more susceptible to
off-target drift.
a. True
b. False - ✔✔True
✔✔How is spray particle size related to the terminal velocity of the falling spray
particles?
a. Terminal velocity is independent of spray particle size.
b. Terminal velocity increases as spray particle size increases.
c. Terminal velocity decreases as spray particle size increases.
d. None of the above - ✔✔Terminal velocity increases as spray particle size increases
QUESTIONS AND ANSWERS GRADED A+
✔✔12. The addition of a small amount of a surfactant and/or a wetting agent to a spray
mix may result in the following change in surface tension of the spray mix:
a. No change in surface tension will occur.
b. Surface tension will decrease.
c. Surface tension will increase.
d. None of the above. - ✔✔b. Surface tension will decrease
✔✔13. At a constant temperature, diesel fuel and vegetable oil have surface tensions
that are:
a. The same as that of water.
b. Greater than that of water
c. Less than that of water.
d. None of the above. - ✔✔c. Less than that of water
✔✔14. The surface tension of liquids __________.
a. Increases with increases in temperature.
b. Is independent of changes in temperature.
c. Decreases with increases in temperature.
d. None of the above. - ✔✔c. Decreases with increases in temperature
✔✔15. Surface tension (dynes/cm at 20 degrees C or 68 degrees F) for water is
__________ xylene, diesel fuel and cottonseed oil.
a. Greater than.
b. Same as.
c. Less than.
d. None of the above. - ✔✔a. Greater than
✔✔16. __________ is a measure of the capacity of a substance to evaporate.
a. Viscosity.
b. Vapor pressure.
c. Surface tension.
d. All of the above. - ✔✔b. Vapor pressure
✔✔17. What change in the vapor pressure of liquids might be expected when the
temperature changes?
a. Vapor pressure is independent of changes in temperature.
b. Vapor pressure decreases as temperature increases.
c. Vapor pressure increases as temperature increases.
d. None of the above. - ✔✔c. Vapor pressure increases as temperature increases
, ✔✔18. 2,4-D herbicide formulations are commonly referred to as "high volatile", "low
volatile", and "nonvolatile". Non-volatile formulations may vaporize on very hot days.
a. True
b. False - ✔✔a. True
✔✔19. The density of water is __________ than that of diesel fuel and cottonseed oil.
a. Greater.
b. Less.
c. Same as.
d. None of the above. - ✔✔a. Greater
✔✔20. Droplets having the same size but of a less dense liquid will fall __________
than a more dense liquid.
a. Faster.
b. Slower.
c. At the same rate.
d. Must know the temperature to answer. - ✔✔b. Slower
✔✔Application equipment related factors having major effect on droplet size are:
a. Nozzle and nozzle orientation
b. Spray pressure and air speed
c. Boom selection and position
d. All of the above - ✔✔All of the above
✔✔When selecting boom types to get the most effective swath patterns, round booms
are always better than airfoil type booms.
a. True
b. False - ✔✔False
✔✔Small water droplets fall faster than large water droplets.
a. True
b. False - ✔✔False
✔✔Small water droplets fall slower than large water droplets, so are more susceptible to
off-target drift.
a. True
b. False - ✔✔True
✔✔How is spray particle size related to the terminal velocity of the falling spray
particles?
a. Terminal velocity is independent of spray particle size.
b. Terminal velocity increases as spray particle size increases.
c. Terminal velocity decreases as spray particle size increases.
d. None of the above - ✔✔Terminal velocity increases as spray particle size increases
