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# What is Air Practice Questions

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Updated on Sep 25, 2011

Review the following concepts: What is Air Study Guide

## Practice Questions

1. Which of the following is NOT one of the units of air pressure?

a. pascals

b. pounds

c. millibars

d. pounds per square inch

2. When climbing a mountain, which of the following is a true statement about the atmosphere?

a. Pressure decreases and density decreases.

b. Pressure increases and density decreases.

c. Pressure decreases and density remains constant.

d. Pressure increases and density increases.

3. If you climbed a mountain to an altitude of 2,000 meters, how much would you expect the air to cool during your hike? Assume you are in a moist region where the moist adiabatic lapse rate applies.

a. 12° C

b. 1.2° C

c. 20° C

d. 2° C

4. The layer of the atmosphere that contains ozone and absorbs the sun's ultraviolet rays is called what?

a. thermosphere

b. mesosphere

c. troposphere

d. stratosphere

5. For a layer of the atmosphere to have temperature increase with altitude, that layer must have which one of the following?

a. pressure increase with altitude

b. connection to Earth's surface

c. a means of absorbing energy

d. condensation of water vapor

6.  In terms of percentage, the number one gas in the atmosphere is which of the following?

a.  argon

b.  oxygen

c.  water vapor

d.  nitrogen

7.  In terms of both percentage and effect, the biggest greenhouse gas is which of the following?

a.  water vapor

b.  carbon dioxide

c.  methane

d.  ozone

8. The air at 30° C contains 6.6 grams of water as water vapor per kilogram of dry air, which makes a 25% relative humidity. How many grams of water as water vapor would that same air have at 100% relative humidity?

a.  1.65

b.  26.4

c.  3.3

d.  6.6

9. Water vapor is not included in the list of gases in the standard table of the atmosphere because of which of the following?

a.  It is difficult to measure.

b.  It makes clouds.

c.  It varies so much.

d.  It is a greenhouse gas.

10.  Which three gases make up 99.96% of the standard dry atmosphere?

a.  nitrogen, krypton, carbon dioxide

b.  water vapor, oxygen, nitrogen

c.  oxygen, argon, nitrogen

d.  carbon dioxide, oxygen, argon

1. b. pounds

2. a. Pressure decreases and density decreases.

3. a. 12°C

4. d. stratosphere

5. c. a means of absorbing energy

6. d. nitrogen

7. a. water vapor

8. b. 26.4

9. c. It varies so much.

10. c. oxygen, argon, nitrogen

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