Download Chapter 6 Review

Meteorology CP
Chapter 6 Review
Chapter 6 – Air Pressure and Winds
1. If two air parcels at sea level have the same size but different temperatures, the colder parcel
of air will have:
a. a higher pressure but the same density as the warm parcel
b. the same pressure but lower density than the warm parcel
c. the same pressure but higher density than the warm parcel
d. a lower pressure but the same density as the warm parcel
2. If surface air pressure decreases, the height of the column in a mercury barometer would:
a. remain constant
b. increase
c. decrease
d. change momentarily, but return to its earlier reading
3. A barograph will:
a. measure and record atmospheric pressure
b. maintain the pressure in a room at a preset value
c. predict pressures 1 or 2 days before they occur
d. draw isobars on a surface weather map
4. The unit of pressure most commonly found on a surface weather map:
a. inches of mercury
b. millibars or hectopascals
c. pounds per square inch
d. atmospheres
5. Which of the following instruments measures pressure?
a. barometer
b. thermometer
c. radiometer
d. hygrometer
e. densitometer
6. An aneroid barometer carried from sea level to the top of a 300 m (1000 ft) hill would indicate:
a. low humidity
b. stormy weather
c. clear skies
d. fair weather
7. A station at an altitude of 900 m (about 3000 feet) above sea level measures an air pressure of
930 mb. Under normal conditions, which of the values below do you think would be the most
realistic sea level pressure for this station?
a. 840 mb
b. 930 mb
c. 1020 mb
d. 1830 mb
8. Suppose a station at sea level measures an air pressure of 1030 mb. Under standard
conditions, what would be the most likely air pressure at an elevation of 600 m (about 2000 ft)
above this station?
a. 1090 mb
b. 1030 mb
c. 1024 mb
d. 1010 mb
e. 970 mb
9. To correctly monitor horizontal changes in air pressure, the most important correction for a
mercury barometer is the correction for:
a. temperature
b. altitude
c. density
d. gravity
10. Lines connecting points of equal pressure are called:
a. isobars
b. millibars
c. contours
d. isotherms
e. a coordinate grid
11. Pressure changes:
a. more rapidly in the horizontal direction than in the vertical
b. more rapidly in the vertical direction than in the horizontal
c. at the same rate in the horizontal and vertical directions
d. more rapidly in the vertical over land than over the ocean.
12. On a weather map, ridges are:
a. elongated low pressure areas
b. dying hurricanes
c. mountains that stall the movement of storms
d. elongated high pressure areas
e. tornadoes that touch the surface
13. On an isobaric surface,
a. altitude is constant
b. temperature is constant
c. pressure is constant
d. both a and c
14. On a 500 millibar chart,
are drawn to represent horizontal changes in altitude which
correspond to horizontal changes in pressure.
a. contour lines
b. isobars
c. isotherms
d. isotachs
15. The contour lines drawn on a 500 mb chart are lines of constant:
a. pressure
b. altitude
c. density
d. wind direction
16. Warm air aloft is associated with constant pressure surfaces that are found at
than normal and _____than normal atmospheric pressure aloft.
a. higher, higher
b. higher, lower
c. lower, higher
d. lower, lower
17. On an upper-level chart, normally we find warm air associated with
cold air associated with _____ pressure.
a. high, high
b. high, low
c. low, low
d. low, high
18. A surface low pressure center is generally associated with
a. a trough
b. a ridge
c. zonal flow
d. convergence
____ altitude
____ pressure, and
_ on an upper level isobaric chart.
19. On an upper-level chart the wind tends to blow:
a. at right angles to the isobars or contour lines
b. parallel to the isobars or contours
c. at an angle between 10 and 30 to the contours and towards lower pressure
d. at constant speed
20. A ridge on an upper-level isobaric chart indicates:
a. higher-than-average heights
b. lower-than-average heights
c. average heights
d. a region with calm winds
21. The Coriolis force is the force that causes the wind to blow.
a. true
b. false
22. Which of the following forces does not have a direct effect on horizontal wind motions?
a. pressure gradient force
b. frictional force
c. gravitational force
d. Coriolis force
23. Which of the following can influence wind direction?
a. Coriolis force
b. pressure gradient force
c. centripetal force
d. all of the above
24. Which of the following forces can not act to change the speed of the wind?
a. pressure gradient force
b. frictional force
c. Coriolis force
d. none of the above
25. The amount of pressure change that occurs over a given horizontal distance is called the:
a. pressure tendency
b. Coriolis parameter
c. pressure gradient
d. potential gradient
e. slope
26. The pressure gradient force is directed from higher pressure toward lower pressure:
a. only at the equator
b. at all places on earth except for the equator
c. only in the Northern Hemisphere
d. only in the Southern Hemisphere
e. at all places on earth
27. The ______ is an apparent force created by the earth's rotation.
a. pressure gradient force
b. Coriolis force
c. centripetal force
d. gravitational force
28. When the wind blows in a more or less west to east direction, the wind flow pattern is called:
a. gradient
b. meridional
c. centripetal
d. zonal
29. A wind that blows at a constant speed parallel to curved isobars or contour lines is called a:
a. geostrophic wind
b. cyclonic wind
c. convergent wind
d. gradient wind
30. A wind flow pattern that takes on a more or less north-south trajectory is called:
a. gradient flow
b. zonal flow
c. cyclostrophic flow
d. meridional flow
e. geostrophic flow
31. The wind around a surface high pressure center in the Northern Hemisphere blows:
a. counterclockwise and outward from the center
b. counterclockwise and inward toward the center
c. clockwise and outward from the center
d. clockwise and inward toward the center
32. We can generally expect the air to be
areas of surface high pressure.
a. rising, rising
b. rising, sinking
c. sinking, sinking
d. sinking, rising
above areas of surface low pressure and
above
Questions 33-35 refer to the figure above.
33. The figure above depicts _____ winds.
a. surface-level
b. upper-air
34. In the figure above, the winds are blowing around an area of _____
a. high pressure
b. low pressure
35. The figure above depicts weather conditions in the
a. northern hemisphere
b. southern hemisphere