The Atmosphere

Question 1

The gas that makes up the largest proportion of the atmosphere is

A. oxygen.
B. carbon monoxide.
C. nitrogen.
D. carbon dioxide.

Answer 1

C. nitrogen

Question 2

As altitude increases, the percentage of oxygen in the atmosphere

A. increases at a relatively constant rate.
B. remains relatively constant at 21% (although at extremely high altitudes, i.e. ~800 km, the atmospheric concentration of oxygen increases substantially).
C. decreases at a relatively constant rate.
D. remains relatively constant at 21%.

Answer 2

D. remains relatively constant at 21%

Question 3

Select the correct answer:

A. Atmospheric pressure increases as altitude decreases. This means the concentration of oxygen molecules continually increases with increasing altitude.
B. Atmospheric pressure increases as altitude increases. This means the concentration of oxygen molecules continually drops with increasing altitude.
C. Atmospheric pressure decreases as altitude increases. This means the concentration of oxygen molecules continually drops with increasing altitude.
D. Atmospheric pressure decreases as altitude decreases. This means the concentration of oxygen molecules continually drops with increasing altitude.

Answer 3

C. Atmospheric pressure decreases as altitude increases. This means the concentration of oxygen molecules continually drops with increasing altitude

Question 4

What gas is most abundant in the atmosphere?

A. ozone.
B. carbon dioxide.
C. nitrogen.
D. oxygen.

Answer 4

C. nitrogen

Question 5

Which of the following statements is TRUE about the partial pressure of oxygen in the lungs?

A. It is directly correlated with altitude.
B. At sea level, it measures 150 mmHg.
C. Water vapour and carbon dioxide gas reduce the partial pressure.
D. At sea level, it measures 300 mmHg.

Answer 5

C. Water vapour and carbon dioxide gas reduce the partial pressure

Question 6

Which of the following statements is TRUE of the concentration of oxygen in the atmosphere?

A. It remains constant as altitude increases.
B. It increases as altitude increases.
C. It is highest at ground level the world over.
D. It decreases with an increase in altitude.

Answer 6

D. It decreases with an increase in altitude

Question 7

In the troposphere (up to _____ ft), atmospheric pressure decreases at an average rate of 33.86 hPa (1 in. Hg) per every thousand feet of altitude increase (approximately _____).

A. 33,090; 1 hPa/27 ft.
B. 39,090; 1 hPa/30 ft.
C. 36,090; 1 hPa/30 ft.
D. 36,090; 1 hPa/27 ft.

Answer 7

C. 36,090; 1 hPa/30ft

Question 8

Select the correct statement:

A. As altitude increases, the percentage of O2 in the atmosphere decreases at a relatively constant rate.
B. As altitude increases, the percentage of O2 in the atmosphere remains relatively constant at 21% (although at extremely high altitudes (~800 km), the atmospheric concentration of oxygen increases substantially).
C. As altitude increases, the percentage of O2 in the atmosphere remains relatively constant at 21%.
D. As altitude increases, the percentage of O2 in the atmosphere increases at a relatively constant rate.

Answer 8

C. As altitude increases, the percentage of O2 in the atmosphere remains relatively constant at 21%

Question 9

What is the standard atmospheric pressure?

A. 1011.25 hPa.
B. 29.97 inch Hg.
C. 29.87 inch Hg.
D. 1013.25 hPa.

Answer 9

D. 1013.25 hPa

Question 10

Select the correct statement:

A. In the troposphere (up to 39,060 ft), atmospheric pressure decreases at an average rate of 33.86 hPa (1 in. Hg) per every thousand feet of altitude increase (approx. 1 hPa/30 ft).
B. In the troposphere (up to 33,090 ft), atmospheric pressure decreases at an average rate of 33.86 hPa (1 in. Hg) per every thousand feet of altitude increase (approx. 1 hPa/27 ft).
C. In the troposphere (up to 36,090 ft), atmospheric pressure decreases at an average rate of 33.86 hPa (1 in. Hg) per every thousand feet of altitude increase (approx. 1 hPa/30 ft).
D. In the troposphere (up to 36,090 ft), atmospheric pressure decreases at an average rate of 33.86 hPa (1 in. Hg) per every thousand feet of altitude increase (approx. 1 hPa/27 ft).

Answer 10

C. In the troposphere (up to 36,090 ft), atmospheric pressure decreases at an average rate of 33.86 hPa (1 in. Hg) per every thousand feet of altitude increase (approx. 1 hPa/30 ft)