Question 1

What is the term for the temperature at which the water vapor in a gas begins to condense back into a liquid?

Accepted Answer

A)  Triple point 
B)  Critical pressure 
C)  Dew point 
D)  Boiling point 
A)  Triple point 
B)  Critical pressure 
C)  Dew point 
D)  Boiling point

Question 2

Which of the following occur(s) when water vapor is added to a dry gas at a constant pressure?
1) The volume occupied by the gas mixture decreases.
2) The relative humidity of the mixture increases.
3) The partial pressure of the original gas is reduced.

Accepted Answer

A) 1 and 2 only 
B) 1 and 3 only 
C) 1, 2 and 3 
D) 3 only 
A) 1 and 2 only 
B) 1 and 3 only 
C) 1, 2 and 3 
D) 3 only

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 
A)  Evaporation 
B)  Sublimation 
C)  Boiling 
D)  Vaporization

Question 4

Which of the following design components of an air injector would result in entraining the greatest amount of air?
1) Small orifice jet
2) Large entrainment ports
3) Low-velocity gas flow

Accepted Answer

A) 1, 2, and 3 
B) 1 and 2 only 
C) 1 and 3 only 
D) 3 only 
A) 1, 2, and 3 
B) 1 and 2 only 
C) 1 and 3 only 
D) 3 only

Question 5

Archimedes' principle is applied clinically in which of the following devices?

Accepted Answer

A)  Nebulizer 
B)  Capillary tube 
C)  Hydrometer 
D)  Humidifier 
A)  Nebulizer 
B)  Capillary tube 
C)  Hydrometer 
D)  Humidifier

Question 6

What is the phenomenon whereby a liquid in a small tube tends to move upward against the force of gravity?

Accepted Answer

A)  Capillary action 
B)  Shear stress 
C)  Surface tension 
D)  Buoyancy 
A)  Capillary action 
B)  Shear stress 
C)  Surface tension 
D)  Buoyancy

Question 7

The peak pressure on a ventilator reads 40 cm H2O. What is the equivalent pressure in mm Hg?

Accepted Answer

A)  37.0 mm Hg 
B)  29.6 mm Hg 
C)  68.3 mm Hg 
D)  4.9 mm Hg 
A)  37.0 mm Hg 
B)  29.6 mm Hg 
C)  68.3 mm Hg 
D)  4.9 mm Hg

Question 8

Which of the following medical gases can be maintained in the liquid form at room temperature?
1) Nitrous oxide
2) Carbon dioxide
3) O2
4) Helium

Accepted Answer

A) 1 and 2 only 
B) 2, 3, and 4 only 
C) 2 and 3 only 
D) 2 and 4 only 
A) 1 and 2 only 
B) 2, 3, and 4 only 
C) 2 and 3 only 
D) 2 and 4 only

Question 9

What temperature is necessary to liquefy O2 at 1 atm pressure?

Accepted Answer

A)  -118.8° C 
B)  -181.1° F 
C)  -463.3° F 
D)  -183.0° C 
A)  -118.8° C 
B)  -181.1° F 
C)  -463.3° F 
D)  -183.0° C

Question 10

Which of the following is a false statement about O2?

Accepted Answer

A)  No pressure can keep it in a liquid state above -118.8° C. 
B)  Below its boiling point, it remains liquid at ambient pressure. 
C)  Its critical temperature is above normal room temperature. 
D)  It cannot be turned into a liquid at room temperature. 
A)  No pressure can keep it in a liquid state above -118.8° C. 
B)  Below its boiling point, it remains liquid at ambient pressure. 
C)  Its critical temperature is above normal room temperature. 
D)  It cannot be turned into a liquid at room temperature.

Question 11

Which of the following are true about molecular water vapor?
1) Water vapor exhibits kinetic activity.
2) Molecular water vapor can be seen.
3) Water vapor exerts pressure.

Accepted Answer

A) 1 and 2 only 
B) 2 and 3 only 
C) 1, 2, and 3 
D) 1 and 3 only 
A) 1 and 2 only 
B) 2 and 3 only 
C) 1, 2, and 3 
D) 1 and 3 only

Question 12

What is the primary means by which heat transfer occurs in fluids?

Accepted Answer

A)  Convection 
B)  Radiation 
C)  Conduction 
D)  Evaporation 
A)  Convection 
B)  Radiation 
C)  Conduction 
D)  Evaporation

Question 13

Which of the following is false about evaporation?

Accepted Answer

A)  Evaporation is a type of vaporization. 
B)  The process of evaporation warms the surrounding air. 
C)  Evaporation is the change of a liquid substance into a gas. 
D)  For evaporation to occur, heat energy is needed. 
A)  Evaporation is a type of vaporization. 
B)  The process of evaporation warms the surrounding air. 
C)  Evaporation is the change of a liquid substance into a gas. 
D)  For evaporation to occur, heat energy is needed.

Question 14

What is the physical process whereby atoms or molecules tend to move from an area of higher concentration or pressure to an area of lower concentration or pressure?

Accepted Answer

A)  Sublimation 
B)  Melting 
C)  Diffusion 
D)  Capillary action 
A)  Sublimation 
B)  Melting 
C)  Diffusion 
D)  Capillary action

Question 15

What force is responsible for the spherical shape of liquid droplets and their ability to keep this shape when placed into an aerosol suspension?

Accepted Answer

A)  Cohesion 
B)  Adhesion 
C)  Viscosity 
D)  Surface tension 
A)  Cohesion 
B)  Adhesion 
C)  Viscosity 
D)  Surface tension

Question 16

A gas at 50° C with a relative humidity of 100% is cooled to 37° C. Which of the following will occur?
1) Condensation on surfaces
2) Visible droplet formation
3) Warming of the adjacent air

Accepted Answer

A) 1, 2, and 3 
B) 1 and 2 only 
C) 1 and 3 only 
D) 2 and 3 only 
A) 1, 2, and 3 
B) 1 and 2 only 
C) 1 and 3 only 
D) 2 and 3 only

Question 17

Which of the following conditions tend to cause laminar flow to become turbulent (producing a high Reynold's number)?
1) High linear gas velocity
2) High gas density
3) Low gas viscosity
4) Smaller tube diameter

Accepted Answer

A) 2, 3, and 4 only 
B) 2 and 3 only 
C) 1, 2, and 3 only 
D) 1 and 4 only 
A) 2, 3, and 4 only 
B) 2 and 3 only 
C) 1, 2, and 3 only 
D) 1 and 4 only

Question 18

Which of the following factors determine how much of a given gas can dissolve in a liquid?
1) Solubility coefficient of the gas
2) Temperature of the liquid
3) Gas pressure above the liquid

Accepted Answer

A) 2 and 3 only 
B) 1 and 2 only 
C) 1 and 3 only 
D) 1, 2, and 3 
A) 2 and 3 only 
B) 1 and 2 only 
C) 1 and 3 only 
D) 1, 2, and 3

Question 19

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

Accepted Answer

A) 1 and 2 only 
B) 1, 2, and 3 
C) 2 and 3 only 
D) 1 only 
A) 1 and 2 only 
B) 1, 2, and 3 
C) 2 and 3 only 
D) 1 only

Question 20

What physical principle underlies most fluidic circuitry?

Accepted Answer

A)  Poiseuille's law 
B)  Bernoulli's principle 
C)  Law of continuity 
D)  Coanda effect 
A)  Poiseuille's law 
B)  Bernoulli's principle 
C)  Law of continuity 
D)  Coanda effect

Exam 6: Physical Principles of Respiratory Care

What is the term for the temperature at which the water vapor in a gas begins to condense back into a liquid?

Which of the following occur(s) when water vapor is added to a dry gas at a constant pressure? 1) The volume occupied by the gas mixture decreases. 2) The relative humidity of the mixture increases. 3) The partial pressure of the original gas is reduced.

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

Which of the following design components of an air injector would result in entraining the greatest amount of air? 1) Small orifice jet 2) Large entrainment ports 3) Low-velocity gas flow

Archimedes' principle is applied clinically in which of the following devices?

What is the phenomenon whereby a liquid in a small tube tends to move upward against the force of gravity?

The peak pressure on a ventilator reads 40 cm H2O. What is the equivalent pressure in mm Hg?

Which of the following medical gases can be maintained in the liquid form at room temperature? 1) Nitrous oxide 2) Carbon dioxide 3) O2 4) Helium

What temperature is necessary to liquefy O2 at 1 atm pressure?

Which of the following is a false statement about O2?

Which of the following are true about molecular water vapor? 1) Water vapor exhibits kinetic activity. 2) Molecular water vapor can be seen. 3) Water vapor exerts pressure.

What is the primary means by which heat transfer occurs in fluids?

Which of the following is false about evaporation?

What is the physical process whereby atoms or molecules tend to move from an area of higher concentration or pressure to an area of lower concentration or pressure?

What force is responsible for the spherical shape of liquid droplets and their ability to keep this shape when placed into an aerosol suspension?

A gas at 50° C with a relative humidity of 100% is cooled to 37° C. Which of the following will occur? 1) Condensation on surfaces 2) Visible droplet formation 3) Warming of the adjacent air

Which of the following conditions tend to cause laminar flow to become turbulent (producing a high Reynold's number)? 1) High linear gas velocity 2) High gas density 3) Low gas viscosity 4) Smaller tube diameter

Which of the following factors determine how much of a given gas can dissolve in a liquid? 1) Solubility coefficient of the gas 2) Temperature of the liquid 3) Gas pressure above the liquid

What physical principle underlies most fluidic circuitry?

History of Respiratory Care

Delivering Evidence-Based Respiratory Care

Quality, Patient Safety, and Communication, and Recordkeeping

Principles of Infection Prevention and Control

Ethical and Legal Implications of Practice

E-Medicine in Respiratory Care

Fundamentals of Respiratory Care Research

The Respiratory System

The Cardiovascular System

Ventilation

Gas Exchange and Transport

Solutions, Body Fluids, and Electrolytes

Acid-Base Balance

Regulation of Breathing

Bedside Assessment of the Patient

Interpreting Clinical and Laboratory Data

Interpreting the Electrocardiogram

Analysis and Monitoring of Gas Exchange

Pulmonary Function Testing

Review of Thoracic Imaging

Flexible Bronchoscopy and the Respiratory Therapist

Nutrition Assessment

Pulmonary Infections

Obstructive Lung Disease: Chronic Obstructive Pulmonary Disease Copd, Asthma, and Related Diseases

Interstitial Lung Disease

Pleural Diseases

Pulmonary Vascular Disease

Acute Respiratory Distress Syndrome

Trauma, Burns and Near Drowning

Lung Cancer

Neuromuscular and Other Diseases of the Chest Wall

Disorders of Sleep

Neonatal and Pediatric Respiratory Disorders

Airway Pharmacology

Airway Management

Emergency Cardiovascular Life Support

Humidity and Bland Aerosol Therapy

Aerosol Drug Therapy

Storage and Delivery of Medical Gases

Medical Gas Therapy

Lung Expansion Therapy

Airway Clearance Therapy Act

Respiratory Failure and the Need for Ventilatory Support

Mechanical Ventilators

Physiology of Ventilatory Support

Patient Ventilator Interaction

Initiating and Adjusting Invasive Ventilatory Support

Noninvasive Ventilation

Extracorporeal Life Support Ecls

Monitoring the Patient in the Intensive Care Unit

Discontinuing Ventilatory Support

Neonatal and Pediatric Respiratory Care

Patient Education and Health Promotion

Cardiopulmonary Rehabilitation

Respiratory Care in Alternative Settings

Filters

The peak pressure on a ventilator reads 40 cm H₂O. What is the equivalent pressure in mm Hg?

Which of the following medical gases can be maintained in the liquid form at room temperature? 1) Nitrous oxide 2) Carbon dioxide 3) O₂ 4) Helium

What temperature is necessary to liquefy O₂ at 1 atm pressure?

Which of the following is a false statement about O₂?