Chapter 06 Physical Principles of Respiratory Care

Chapter 06  Physical Principles of Respiratory Care

Complete Chapter Questions And Answers
 

Sample Questions

MULTIPLE CHOICE

1. Which of the following statements about liquids is NOT true?
a.
They exhibit the phenomenon of flow.
b.
They assume the shape of their container.
c.
They are difficult to compress.
d.
They expand to fill their container.

ANS: D
Liquid molecules also exhibit mutual attraction. However, because these forces are much weaker in liquids than in solids, liquid molecules can move about freely (Figure 6-1, B). This freedom of motion explains why liquids take the shape of their containers and are capable of flow. However, like solids, liquids are dense and cannot easily be compressed or expanded.

DIF: Application REF: p. 103 OBJ: 1

2. Which of the following statements correctly describe(s) gases?
1. Gases exhibit the phenomenon of flow.
2. Molecular forces of attraction are minimal.
3. Gases are easily compressible.
4. Gases expand to fill their container.
a.
1 and 2
b.
1, 2, and 3
c.
2, 3, and 4
d.
1, 2, 3, and 4

ANS: D
In a gas, molecular attractive forces are very weak. Thus, gas molecules, which lack restriction to their movement, exhibit rapid, random motion with frequent collisions (Figure 6-1, C). Gases have no inherent boundaries and are easily compressed and expanded. Moreover, like liquids, gases can flow.

DIF: Application REF: p. 103 OBJ: 1

3. At what temperature does all kinetic activity of matter cease?
a.
0°K
b.
0°C
c.
32°C
d.
0°F

ANS: A
The SI (Systeme Internationale) units for temperature are degrees Kelvin, with a zero point equal to absolute zero (0°K).

DIF: Recall REF: p. 105 OBJ: 3

4. A patient has a recorded body temperature of 106° F. What is this temperature in degrees Celsius?
a.
41°C
b.
98°C
c.
39°C
d.
22°C

ANS: A
To convert degrees Fahrenheit to degrees Celsius, use the following formula: °C = 5/9 × (° F – 32).

DIF: Analysis REF: p. 106 OBJ: 3

5. A near-drowning patient has a recorded body temperature of 30° C. What is the equivalent temperature in degrees Fahrenheit?
a.
–4°F
b.
86°F
c.
32°F
d.
77°F

ANS: B
To convert degrees Celsius to degrees Fahrenheit, simply reverse the formula given in question 4: ° F = (9/5 × ° C) + 32.

DIF: Analysis REF: p. 106 OBJ: 3