2. Usually, the air pressure inside a building is the air pressure outside the building. a. greater than b. about the same as c.

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1 CHAPTER 5 AIR PRESSURE MULTIPLE CHOICE QUESTIONS 1. The magnitude of pressure exerted by the gas molecules composing air depends on a. the mass of the air molecules. b. the pull of gravity. c. the kinetic energy of air molecules. 2. Usually, the air pressure inside a building is the air pressure outside the building. a. greater than b. about the same as c. less than 3. So that barometer readings are accurate and representative, a. the instrument must always be mounted outdoors and in a special instrument shelter. b. the instrument must always be mounted outdoors but not in a special instrument shelter. c. the instrument must always face the Sun during daylight hours. d. the instrument may be mounted indoors. 4. The average air pressure at sea level is a lb per square inch. b mb. c. 101,325 Pascals. d. All of these are correct. e. None of these is correct. 5. The usual world-wide range in sea-level air pressure is 100 mb. a. about equal to b. less than c. more than 6. Between the tropopause and stratopause, the air pressure with increasing altitude. a. increases b. decreases c. does not change 7. The top of the atmosphere is at an average altitude of km. a. 80

2 b. 100 c. 5 d. 10 e. None of these is correct. 8. What fraction of the atmosphere's mass is below an aircraft flying at the 600 mb level? a. 0.6 b. 0.4 c. 0.2 d What fraction of the atmosphere is below the 500 mb level? a. 0.5 b. 0.8 c d. 0.3 e The state of the atmosphere averaged for all latitudes and seasons is known as a. the average global atmosphere. b. the standard atmosphere. c. a homogenous atmosphere. 11. The elevation of the 500-mb surface a. depends on the average temperature of the air between Earth's surface and the 500-mb level. b. varies with latitude and time. c. can be determined by a radiosonde. 12. At an altitude of about 3.5 mi above sea level, the air pressure is approximately a mb. b. 750 mb. c. 500 mb. d. 250 mb. 13. At sea level, the pressure of the atmosphere is a. the least. b. the greatest. 14. The type of barometer that is used to measure altitude: a. mercury b. aneroid c. thermal d. radiosonde e. psychrometer

3 15. A(n) can be used to predict the weather by keeping track of the air pressure tendency. a. psychrometer b. anemometer c. thermometer d. barometer 16. An air-pressure altimeter is actually a(n) barometer. a. mercury b. aneroid 17. Within the thermosphere, the temperature is and heat energy is. a. low...low b. high...high c. low...high d. high...low 18. When air pressure readings at Denver (the "mile-high city") are adjusted to sea level, barometric pressure readings are a. increased. b. decreased. c. not changed. 19. Adjusting barometer readings to sea level removes the influence of on air pressure. a. air temperature b. wind speed c. station elevation d. humidity e. divergence 20. Changes of air pressure in the horizontal are they are in the vertical. a. much smaller than b. much larger than c. about the same as 21. An air mass is a huge volume of air that is relatively uniform horizontally in a. temperature. b. humidity. c. Both of these are correct. d. None of these is correct. 22. Air pressure decreases with increasing altitude. a. uniformly b. non-uniformly 23. The concentration of oxygen (O 2 ) in parts per million by volume with increasing

4 altitude within the troposphere. a. decreases b. increases c. does not change 24. The temperature of rising parcels of unsaturated air because of. a. drops compressional warming b. drops......expansional cooling c. drops radiational cooling d. drops latent heating e. rises compressional warming 25. At the same pressure, air is less dense then air. a. cold, dry.warm, dry b. warm, dry cold, dry 26. At the same pressure, warm and humid air is equally warm and dry air. a. denser than b. less dense than c. about as dense as 27. At the same temperature and pressure, humid air is dry air. a. denser than b. less dense than c. about as dense as 28. Relatively high surface air pressure is usually accompanied by weather whereas relatively low surface air pressure is usually accompanied by weather. a. fair...stormy b. stormy...fair 29. The tropopause at a particular location is generally in winter than in summer. a. lower b. higher 30. If the surface air pressure is the same everywhere, but a mass of cold air is situated next to a mass of warm air, the pressure at high altitudes is a. greater in the warm air. b. greater in the cold air. c. greater between the warm air and cold air. d. the same in the warm air and the cold air. 31. With the same volumes, a cold and dry air mass exerts surface air pressure than a warm and humid air mass. a. higher b. lower

5 32. With the same volumes, a warm and dry air mass exerts surface air pressure than an equally warm but humid air mass. a. higher b. lower 33. When a warm and humid air mass replaces a cold and dry air mass at a particular locality, the air pressure at Earth s surface usually a. rises. b. falls. c. does not change. 34. The decline of air pressure with altitude is most rapid in air masses. a. warm and humid b. cold and humid c. warm and dry d. cold and dry 35. Because of the usual seasonal change in average temperature, the troposphere is denser in than in. a. winter...summer b. summer...winter 36. Compared to horizontal pressure gradients, vertical pressure gradients are a. much greater. b. about the same. c. much smaller. 37. Changes in air pressure with time at a particular locality may be explained by a. local radiational heating or cooling. b. air mass advection. c. divergence or convergence of surface winds. 38. With cold air advection in winter, the air pressure tendency is usually a. upward. b. downward. c. unchanged. 39. Air pressure tendency is usually with warm air advection in the winter. a. downward b. unchanged c. upward 40. Two weather stations (A and B) at sea level report the same surface air pressures. Warm air is above Station A while relatively cold air is above Station B. At an altitude of 25,000 feet, one

6 would expect the pressure above Station A to be a. higher than that above Station B. b. lower than that above Station B. c. the same as that above Station B. 41. Highs and Lows are identified on surface weather maps by areas enclosed within isobars. Which one of the following statements about Highs is true? a. Air pressure decreases outward from the center of a High. b. Air pressure increases outward from the center of a High. c. All Highs must have central pressures with values greater than mb. d. There must be one and only one High for each Low on the same weather map. 42. Lows and Highs are identified on surface weather maps by areas enclosed within isobars. Which one of the following statements about Lows is true? a. Air pressure increases outward from the center of a Low. b. Air pressure decreases outward from the center of a Low. c. All Lows must have central pressures with values less than mb. d. There must be one and only one Low for each High on the same weather map. 43. A variable of state in the atmosphere: a. temperature b. pressure c. density d. All of these are correct. e. None of these is correct. 44. Air pressure decreases with altitude in the atmosphere. a. never b. sometimes c. always 45. According to the gas law, air pressure is directly proportional to a. air density. b. air temperature. c. Both of these are correct. d. None of these is correct. 46. As a mass of arctic air invades our locality, air temperature and air density. a. falls...increases b. rises...increases c. falls...decreases d. rises...decreases 47. As a mass of warmer and more humid air invades our locality, air temperature and air density. a. falls...increases

7 b. rises...increases c. falls...decreases d. rises...decreases 48. Rising parcels of unsaturated air cool at a rate than rising parcels of saturated (cloudy) air. a. slower b. faster 49. The adiabatic lapse rate is 9.8 Celsius degrees per 1000 m. a. dry b. moist 50. Descending air warms at a. the dry adiabatic lapse rate. b. the rate of 9.8 Celsius degrees per 1000 m. c. the rate of 5.5 Fahrenheit degrees per 1000 ft.

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