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University Of Arizona ATMO 170A Chapter 6 1)A____________usually indicates clearing weather or fair weather

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University Of Arizona

ATMO 170A

Chapter 6

1)A____________usually indicates clearing weather or fair weather.

a.            constant pressure

b.            steadily rising pressure

c.             steadily falling pressure

d.            fluctuating pressure

 

2.            A gradient wind blowing around the low-pressure center is constantly accelerating because it is constantly changing directions. This acceleration is called    .

 

a.            the pressure gradient force

b.            the Coriolis force

c.             centripetal acceleration

d.            cyclonic flow

 

3.            A ridge on an upper-air isobaric chart indicates   .

a.            higher-than-average heights

b.            lower-than-average heights

c.             average heights

d.            a region with calm winds

 

4.            A surface low pressure center is generally associated with           on an upper-air isobaric chart.

a.            a trough to its west

b.            a ridge to its north

c.             zonal flow

d.            convergence over it

 

5.            A wind blowing at a constant speed parallel to straight line isobars with the pressure gradient force (PGF) and the Coriolis force in balance is called a            .

a.            gradient wind

b.            meridional wind

c.             geostrophic wind

d.            cyclostrophic wind

e.            zonal wind

 

6.            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

 

7.            An object is falling at constant speed. The net force is    .

a.            upward

b.            downward

c.             horizontally directed

d.            zero

 

8.            Atmospheric 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 direction over land than over the ocean

 

9.            Cyclonic flow means       in either the Northern or Southern Hemisphere.

a.            clockwise wind flow

b.            counterclockwise flow

c.             circulation around a low pressure center

d.            circulation around a high pressure center

 

 

10.          If the earth's gravitational force were to increase, atmospheric pressure at the ground would

                .

a.            increase

b.            decrease

c.             remain the same

d.            cause the atmosphere to expand vertically

 

11.          In the vertical, the pressure gradient force points             and gravity points            .

a.            toward the earth; away from the earth

b.            toward the earth; toward the earth

c.             away from the earth; away from the earth

d.            away from the earth; toward the earth

 

12.          A station at an altitude of 900 m (about 3,000 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

 

13.          Low        on a constant height chart corresponds to low   on a constant pressure chart.

a.            pressures, pressures

b.            pressures, heights

c.             heights, pressures

d.            heights, heights

 

14.          Net convergence of air would cause surface pressure to               and net divergence would cause surface pressure to         .

a.            increase, decrease

b.            increase, increase

c.             decrease, decrease

d.            decrease, increase

 

15.          On an isobaric surface:

a.            altitude is constant.

b.            temperature is constant.

c.             pressure is constant.

d.            altitude is constant and pressure is constant.

 

16.          On an isobaric weather chart, the spacing of the height contours indicates the magnitude of the

                force.

a.            pressure gradient

b.            Coriolis

c.             thermal

 

d.            gravitational

 

17.          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.

 

18.          On an upper-level isobaric chart, normally we find warm air associated with        heights, and cold air associated with heights.

a.            high, high

b.            high, low

c.             low, low

d.            low, high

 

19.          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.

 

20.          The        force is the force that causes the wind to blow.

a.            Coriolis

b.            pressure gradient

c.             frictional

d.            gravitational

 

21.          The atmosphere around the earth would rush off into space if the vertical pressure gradient force were not balanced by:

a.            the Coriolis force.

b.            the horizontal pressure gradient force.

c.             gravity.

d.            the centripetal force.

e.            friction.

 

22.          The contour lines drawn on a 500 mb chart are lines of constant:

a.            pressure.

b.            altitude.

c.             density.

d.            wind direction.

 

23.          The force that would cause a stationary parcel of air to begin to move horizontally is called the:

a.            Coriolis force.

b.            pressure gradient force.

c.             bipedal force.

d.            frictional force.

 

24.          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.

 

25.          The surface air around a strengthening low pressure area normally          , while air aloft, directly above the surface low, normally     .

a.            diverges, diverges

b.            diverges, converges

c.             converges, converges

d.            converges, diverges

 

26.          The surface pressures at the bases of warm and cold columns of air are equal. Air pressure in the warm column of air will              with increasing height    than in the cold column.

a.            decrease, more rapidly

b.            decrease, more slowly

c.             increase, more rapidly

d.            increase, more slowly

 

27.          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.

 

28.          Warm air aloft is associated with constant pressure surfaces that are found at    altitude than normal and                than normal atmospheric pressure aloft.

a.            higher, higher

b.            higher, lower

c.             lower, higher

d.            lower, lower

 

29.          We can generally expect the air to be     above areas of surface low pressure and

                above areas of surface high pressure.

a.            rising, rising

b.            rising, sinking

c.             sinking, sinking

d.            sinking, rising

 

30.          Which of the following can influence wind direction?

a.            Coriolis force

b.            pressure gradient force

c.             centripetal force

d.            all of these choices

 

31.          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 these choices

 

32.          An altimeter is often just an aneroid barometer that has been calibrated to indicate altitude. a. True

b. False

 

33.          Fast winds at high latitudes produce the strongest Coriolis force. a. True

b. False

 

34.          If the earth stopped rotating there would no longer be a Coriolis force. a. True

b. False

 

35.          If, at your home in the Northern Hemisphere, the surface wind is blowing from the northwest, then the region of lowest pressure will be to the east of your home.

a. True

b. False

 

36.          Suppose that the winds aloft are geostrophic and blowing from the north. Low pressure is located to the east.

a. True

b. False

 

37.          Surface winds blow across the isobars at an angle due to the frictional force. a. True

b. False

 

38.          The rate of the earth's rotation determines the strength of the pressure gradient force.

a.            False

b. True

 

39.          The vertical pressure gradient force is directed downward.

a.            False

b. True

 

40.          Winds blow slightly inward around surface low pressure centers in the Southern Hemisphere

 a.True

b. False