USCG AUXAIR TRAINING STUDY GUIDE
2026 VERIFIED QUESTION SET AND
SOLUTIONS
◉ 2-10 Which is heavier, a pound of air or a pound
of iron?
Answer: a. The air
b. The iron
c. Neither, they have the same density
d. Neither, but the iron is more dense [13]
◉ 2-11 An Auxiliarist weighing 150 pounds stands
on a scale with an area of half a square foot. A
weight of 300 pounds sits on a piece of plywood
with an area of one square foot.
Answer: a. The pressure on the scale is less than the
pressure on the plywood.
b. The pressure on the scale is the same as
the pressure on the plywood. [14]
c. The pressure on the scale is more than the
pressure on the plywood.
,d. There is more weight on the scale.
◉ 2-12 When air is free to expand, its temperature
may be changed by
Answer: a. changing its volume
b. adding heat energy
c. removing heat energy
d. all of the above [14, 15]
◉ 2-13 If the volume of some air increases by ten
percent, but the temperature of the air remains
constant, the air pressure will
Answer: a. decrease by ten percent [15]
b. increase by ten percent
c. not change
d. be proportional to the volume
◉ 2-14 Standard atmospheric temperature and pressure
at sea level are
Answer: a. 59 oF and 29.92 inches of mercury
b. 15 oC and 29.92 millibars
c. 15oC and 1013.2 millibars
,d. either a. or c. [16]
◉ 2-15 Standard values of atmospheric temperature,
pressure, and density
Answer: a. are world wide averages
b. are different at different altitudes
c. both of the above [16]
d. none of the above
◉ 2-16 Almost all of the earth's weather occurs
Answer: a. in the tropopause
b. in the troposphere [16]
c. below an altitude of 6500 feet
d. above the tropopause
◉ 2-17 The height of the tropopause is generally
between ______ feet above sea level
Answer: a. 6500 and 30000
b. 25000 and 30000
c. 6500 and 65000
d. 25000 and 65000 [16, 17]
, ◉ 2-18 A hot air balloon tends to rise because
Answer: a. the air in the balloon is less
dense than the surrounding
air outside the balloon [17]
b. the pressure in the balloon is greater than
the pressure outside the balloon
c. the air in the balloon is warmer than the
air outside the balloon
d. the air in the balloon contains more heat
energy than the air outside the balloon
◉ 2-19 The amount of water vapor in the atmosphere
Answer: a. may be as much as 4 percent
b. is usually lower near the poles than in the
tropics
c. is usually greater over coastal areas and
oceans than over mid-continental areas
d. all of the above [17, 18]
◉ 2-20 Air is saturated when it contains
Answer: a. four percent water vapor
b. as much water vapor as it can hold at a
2026 VERIFIED QUESTION SET AND
SOLUTIONS
◉ 2-10 Which is heavier, a pound of air or a pound
of iron?
Answer: a. The air
b. The iron
c. Neither, they have the same density
d. Neither, but the iron is more dense [13]
◉ 2-11 An Auxiliarist weighing 150 pounds stands
on a scale with an area of half a square foot. A
weight of 300 pounds sits on a piece of plywood
with an area of one square foot.
Answer: a. The pressure on the scale is less than the
pressure on the plywood.
b. The pressure on the scale is the same as
the pressure on the plywood. [14]
c. The pressure on the scale is more than the
pressure on the plywood.
,d. There is more weight on the scale.
◉ 2-12 When air is free to expand, its temperature
may be changed by
Answer: a. changing its volume
b. adding heat energy
c. removing heat energy
d. all of the above [14, 15]
◉ 2-13 If the volume of some air increases by ten
percent, but the temperature of the air remains
constant, the air pressure will
Answer: a. decrease by ten percent [15]
b. increase by ten percent
c. not change
d. be proportional to the volume
◉ 2-14 Standard atmospheric temperature and pressure
at sea level are
Answer: a. 59 oF and 29.92 inches of mercury
b. 15 oC and 29.92 millibars
c. 15oC and 1013.2 millibars
,d. either a. or c. [16]
◉ 2-15 Standard values of atmospheric temperature,
pressure, and density
Answer: a. are world wide averages
b. are different at different altitudes
c. both of the above [16]
d. none of the above
◉ 2-16 Almost all of the earth's weather occurs
Answer: a. in the tropopause
b. in the troposphere [16]
c. below an altitude of 6500 feet
d. above the tropopause
◉ 2-17 The height of the tropopause is generally
between ______ feet above sea level
Answer: a. 6500 and 30000
b. 25000 and 30000
c. 6500 and 65000
d. 25000 and 65000 [16, 17]
, ◉ 2-18 A hot air balloon tends to rise because
Answer: a. the air in the balloon is less
dense than the surrounding
air outside the balloon [17]
b. the pressure in the balloon is greater than
the pressure outside the balloon
c. the air in the balloon is warmer than the
air outside the balloon
d. the air in the balloon contains more heat
energy than the air outside the balloon
◉ 2-19 The amount of water vapor in the atmosphere
Answer: a. may be as much as 4 percent
b. is usually lower near the poles than in the
tropics
c. is usually greater over coastal areas and
oceans than over mid-continental areas
d. all of the above [17, 18]
◉ 2-20 Air is saturated when it contains
Answer: a. four percent water vapor
b. as much water vapor as it can hold at a
