The Physics of Pressure Discussion Questions

The Physics of Pressure Discussion Questions
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The Physics of Pressure Discussion Questions
1. How much pressure in units of centimetres of water pressure is equivalent to
10 mmHg pressure?
A. 1.36 cm of water
B. 10 cm of water
C. 13.6 cm of water
D. 136 cm of water
Answer is C: 1 mmHg ~ = 1.36 cmH2O, so 10 mmHg ~ = 13.6 cmH2O. Even without knowing the conversion factor between cmH2O and mmHg, you should know
that mercury is much denser than water. Hence choices A and B are not correct.
2. The pressure inside a working suction bottle is most likely to be:
A. 740 mmHg
B. 760 mmHg
C. 780 mmHg
D. 800 mmHg
Answer is A: Given that atmospheric pressure is about 760 mmHg, for suction to
occur, the pressure in the suction bottle must be a “negative” pressure. That is, less
than 760.
3. The volume of gas trapped within a space will increase as pressure decreases; the
physics law that refers to this is:
A. Henry’s law
B. Poiseuille’s law
C. Hugh’s law
D. Boyle’s law
4. Increasing the number of red cells per millilitre of blood will:
A. Increase the viscosity and increase the rate of flow of the blood.
B. Decrease the viscosity and increase the rate of flow of the blood.
C. Increase the viscosity and decrease the rate of flow of the blood.
D. Decrease the viscosity and decrease the rate of flow of the blood.
5. A scuba diver swimming at a depth of 10 m will experience a pressure of how
many atmospheres?
A. 1
B. 1.5
C. 2
D. 3
The Physics of Pressure Discussion Questions
6. What law is being “obeyed” by a gas bubble as it expands inside a person’s colon
as the aeroplane ascends to cruising height?
A. Dolphin’s law
B. Henry’s law
C. Boyle’s law
D. Aames’s law
Answer is C: Boyle’s law relates P and V; the volume of an enclosed gas expands as
pressure decreases. The air pressure in an aeroplane cabin is allowed to decrease to
the equivalent of the air pressure at about 2700 m above sea level.
7. 100 mmHg pressure equates to how many cm of water?
A. 134
B. 13.4
C. 760
D. 76
8. According to Boyle’s law, what will happen in a fixed amount of gas if its volume decreases?
A. The pressure of the gas will decrease.
B. The pressure of the gas will increase.
C. The temperature of the gas will decrease.
D. The temperature of the gas will increase.
9. Consider Boyle’s law. If the pressure being exerted on an enclosed volume of gas
(at a constant temperature) is increased by 20%, by what percentage would its
volume change?
A. Volume would increase by 20%.
B. Volume would increase by 44%.
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C. Volume would decrease by 44%.
D. Volume would decrease by 20%.
10. A suction pump when used to clear an obstructed airway expands the volume in
its chamber to:
A. Produce a negative pressure and obstructing liquid is pushed out by air pressure in the lungs.
B. Produce a positive pressure and obstructing liquid is pushed out by air pressure in the lungs.
C. Produce a negative pressure and obstructing liquid is sucked up into the
chamber.
D. Produce a positive pressure and obstructing liquid is sucked by atmospheric
pressure into the chamber
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