Question 1

A near-drowning patient has a recorded body temperature of 30° C. What is the equivalent temperature in degrees Fahrenheit?

Accepted Answer

A) -4°F 
B) 86°F 
C) 32°F 
D) 77°F

Question 2

Which of the following properties of gases distinguish them from liquids-that is, are unique to the gaseous phase of matter?
I.Gases fill the available space.
II.Gases exhibit viscosity.
III.Gases exert pressure.
IV.Gases are readily compressed.
V.Gases are capable of flow.

Accepted Answer

A) II, III, IV, and V 
B) I, III, and IV 
C) II, III, and IV 
D) I and IV

Question 3

What is the change in state of a substance from liquid to gaseous form occurring below its boiling point?

Accepted Answer

A) evaporation 
B) sublimation 
C) boiling 
D) vaporization

Question 4

What is the term for the ratio of the amount of water vapor in a volume of gas compared to the amount of the water in gas saturated at a normal body temperature of 37°C?

Accepted Answer

A) percent body humidity (BH) 
B) relative humidity (RH) 
C) absolute humidity 
D) water vapor pressure

Question 5

According to Graham's law, which of the following gases would diffuse most quickly? Gas density

Accepted Answer

A) W 1.432 g/L 
B) X 0.543 g/L 
C) Y 0.834 g/L 
D) Z 1.213 g/L

Question 6

Which of the following methods would increase the rate of evaporation of a container of water?
I.Increase the temperature of the surrounding air.
II.Decrease the pressure of the surrounding air.
III.Increase the temperature of the water.

Accepted Answer

A) I and II 
B) II and III 
C) I and III 
D) I, II, and III

Question 7

What is the term for the ratio of the actual water vapor present in a gas compared with the capacity of that gas to hold the vapor at a given temperature?

Accepted Answer

A) relative humidity 
B) absolute humidity 
C) water vapor pressure 
D) percent body humidity

Question 8

A mercury barometer reads 770 mm Hg. What is the actual atmospheric pressure in g/cm2?

Accepted Answer

A) 14.7 g/cm2 
B) 1034.0 g/cm2 
C) 1020.0 g/cm2 
D) 1047.0 g/cm2

Question 9

Both a compressed gas cylinder and its regulator are at room temperature with all valves in the off position. After the cylinder is opened and gas begins flowing, you note that the regulator is extremely cold to touch. Which of the following principles best explains this observation?

Accepted Answer

A) adiabatic compression 
B) Gay-Lussac's law 
C) Joule-Thompson effect 
D) Venturi principle

Question 10

Which of the following conditions tend to cause laminar flow to become turbulent (producing a high Reynold's number)?
I.high linear gas velocity
II.high gas density
III.low gas viscosity
IV.large tube diameter

Accepted Answer

A) II, III, and IV 
B) II and III 
C) I, II, and IV 
D) I, II, III, and IV

Question 11

In what processes of gas compression or expansion does the temperature remain constant?

Accepted Answer

A) isothermal 
B) adiabatic 
C) hypothermal 
D) neutral kinetic

Question 12

What is the equilibrium condition in which a gas holds all the water vapor molecules that it can?

Accepted Answer

A) evaporation 
B) stabilization 
C) saturation 
D) body humidity

Question 13

Respiratory therapists must ensure that any oil or dust is cleared from high-pressure medical-gas delivery systems before pressurization. Why is this action needed?

Accepted Answer

A) Inhaled dust particles can cause pneumoconiosis. 
B) The oil or dust can cause a leak in the system. 
C) Oil or dust does not easily mix with medical gases. 
D) Adiabatic compression could ignite the oil or dust.

Question 14

According to Avogadro's law, which of the following is/are TRUE?
I.One gram of any substance contains the same number of particles.
II.Equal volumes of gases at standard temperature, standard pressure, dry (STPD) have the same number of molecules.
III.Equal numbers of gas molecules at STPD occupy the same volume.

Accepted Answer

A) I and II 
B) I, II, and III 
C) II and III 
D) I

Question 15

You obtain a mercury barometric reading of 760 mm Hg at 17°C. Using the following factor table, compute the corrected pressure. $$\begin{array} { | l | l | l | l | } 
\hline { } ^ { \circ } \mathrm { C } & 740 & 750 & 760 \
\hline 17 & 2.17 & 2.20 & 2.23 \
\hline 18 & 2.29 & 2.32 & 2.35 \
\hline 19 & 2.38 & 2.41 & 2.44 \
\hline
\end{array}$$

Accepted Answer

A) 223.0 mm Hg 
B) 747.7 mm Hg 
C) 757.8 mm Hg 
D) 762.3 mm Hg

Question 16

Which of the following factors determine how much of a given gas can dissolve in a liquid?
I.solubility coefficient of the gas
II.temperature of the liquid
III.gas pressure above the liquid

Accepted Answer

A) II and III 
B) I and II 
C) I and III 
D) I, II, and III

Question 17

Which of the following will occur when a gas undergoes expansion?
IThe pressure of the gas increases.
II.Molecular collisions decrease
III.The gas temperature increases.

Accepted Answer

A) I and II 
B) II and III 
C) II 
D) I and III

Question 18

What is the most common application of Bernoulli's principle in respiratory care equipment?

Accepted Answer

A) fluidic ventilator 
B) pneumotachygraph 
C) air injector 
D)  $\text { U }$ -tube manometer

Question 19

The resistance to flow of a fluid through a tube can be computed according to which of the following formulas?

Accepted Answer

A) resistance = flow * viscosity 
B) resistance = flow / pressure 
C) resistance = pressure / flow 
D) resistance = flow * pressure

Question 20

In the lung's alveoli, there are four gases mixed together: oxygen, carbon dioxide, nitrogen, and water vapor. At a normal barometric pressure of 760 mm Hg, alveolar O2 exerts a partial pressure of 100 mm Hg, CO2 40 mm Hg, and water vapor 47 mm Hg. What is the alveolar partial pressure of nitrogen?

Accepted Answer

A) 187 mm Hg 
B) 713 mm Hg 
C) 660 mm Hg 
D) 573 mm Hg

Exam 6: Physical Principles of Respiratory Care

A near-drowning patient has a recorded body temperature of 30° C. What is the equivalent temperature in degrees Fahrenheit?

Which of the following properties of gases distinguish them from liquids-that is, are unique to the gaseous phase of matter? I.Gases fill the available space. II.Gases exhibit viscosity. III.Gases exert pressure. IV.Gases are readily compressed. V.Gases are capable of flow.

What is the change in state of a substance from liquid to gaseous form occurring below its boiling point?

What is the term for the ratio of the amount of water vapor in a volume of gas compared to the amount of the water in gas saturated at a normal body temperature of 37°C?

According to Graham's law, which of the following gases would diffuse most quickly? Gas density

Which of the following methods would increase the rate of evaporation of a container of water? I.Increase the temperature of the surrounding air. II.Decrease the pressure of the surrounding air. III.Increase the temperature of the water.

What is the term for the ratio of the actual water vapor present in a gas compared with the capacity of that gas to hold the vapor at a given temperature?

A mercury barometer reads 770 mm Hg. What is the actual atmospheric pressure in g/cm²?

Both a compressed gas cylinder and its regulator are at room temperature with all valves in the off position. After the cylinder is opened and gas begins flowing, you note that the regulator is extremely cold to touch. Which of the following principles best explains this observation?

Which of the following conditions tend to cause laminar flow to become turbulent (producing a high Reynold's number) ? I.high linear gas velocity II.high gas density III.low gas viscosity IV.large tube diameter

In what processes of gas compression or expansion does the temperature remain constant?

What is the equilibrium condition in which a gas holds all the water vapor molecules that it can?

Respiratory therapists must ensure that any oil or dust is cleared from high-pressure medical-gas delivery systems before pressurization. Why is this action needed?

Which of the following factors determine how much of a given gas can dissolve in a liquid? I.solubility coefficient of the gas II.temperature of the liquid III.gas pressure above the liquid

Which of the following will occur when a gas undergoes expansion? IThe pressure of the gas increases. II.Molecular collisions decrease III.The gas temperature increases.

What is the most common application of Bernoulli's principle in respiratory care equipment?

The resistance to flow of a fluid through a tube can be computed according to which of the following formulas?