1w051a CDC Volume 1

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  • 1/124 Questions

    What air mass forms over land only during the summer?

    • MTk.
    • MPw.
    • CPk.
    • CT.
Please wait...
About This Quiz

This quiz, titled '1W051A CDC Volume 1', assesses knowledge on atmospheric conditions, focusing on temperature variations, ozone formation, and water vapor effects in different atmospheric layers. It is designed for learners aiming to understand basic meteorological concepts critical for aerospace studies.

1w051a CDC Volume 1 - Quiz

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  • 2. 

    A decrease of mass in a column of air will cause the surface pressure to

    • Increase.

    • Decrease.

    • Remain steady.

    • Do nothing, pressure is not affected by mass.

    Correct Answer
    A. Decrease.
    Explanation
    When there is a decrease in mass in a column of air, it means that there is less air present in that column. As a result, the air molecules are less densely packed, leading to a decrease in pressure. This decrease in mass causes a decrease in the surface pressure.

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  • 3. 

    Which orographic cloud resembles an almond or a fish?

    • Rotor.

    • Lenticular.

    • Foehn wall.

    • Castellanus.

    Correct Answer
    A. Lenticular.
    Explanation
    Lenticular clouds are formed when moist air flows over a mountain or hill and creates a series of standing waves. These clouds are lens-shaped and often have a smooth, rounded appearance, resembling an almond or a fish. They are commonly found in the lee of mountains and can indicate strong winds and turbulence in the atmosphere.

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  • 4. 

    “Clouds or obscuring phenomena that have bases at the same approximate level” is the definition of

    • Sky condition.

    • Sky cover.

    • A ceiling.

    • A layer.

    Correct Answer
    A. A layer.
    Explanation
    The definition provided, "Clouds or obscuring phenomena that have bases at the same approximate level," describes a layer. A layer refers to a type of cloud formation where clouds or other obscuring phenomena are present at the same height or altitude. This term is commonly used in meteorology to describe a specific type of cloud formation in the atmosphere.

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  • 5. 

    How do you report prevailing visibility at US stations and overseas stations?

    • Meters for both.

    • Statute miles for both.

    • Statute miles for US stations and meters for overseas stations.

    • Meters for US stations and statute miles for overseas stations.

    Correct Answer
    A. Statute miles for US stations and meters for overseas stations.
    Explanation
    The prevailing visibility at US stations is reported in statute miles, while at overseas stations it is reported in meters. This means that in the US, visibility is measured and reported in miles, whereas in other countries it is measured and reported in meters.

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  • 6. 

    To properly report the visibility for more than one sector, you would list the sectors in a

    • Clockwise direction starting with the northernmost sector.

    • Clockwise direction starting with the southernmost sector.

    • Counterclockwise direction starting with the northernmost sector.

    • Counterclockwise direction starting with the southernmost sector.

    Correct Answer
    A. Clockwise direction starting with the northernmost sector.
    Explanation
    To properly report the visibility for more than one sector, it is important to list the sectors in a clockwise direction starting with the northernmost sector. This ensures consistency and clarity in reporting the visibility for each sector. By following a clockwise direction, it becomes easier to identify and communicate the visibility for each sector in a systematic manner. Starting with the northernmost sector also helps in maintaining a logical order while reporting the visibility for multiple sectors.

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  • 7. 

    What is the intensity of snow which restricts visibility to less than 1/4 mile?

    • Light.

    • Moderate.

    • Heavy.

    • Intense.

    Correct Answer
    A. Heavy.
    Explanation
    The correct answer is "Heavy" because heavy snowfall significantly reduces visibility to less than 1/4 mile. This means that the snow is falling at a high rate and accumulating quickly, making it difficult to see and navigate through.

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  • 8. 

    "Jet fingers"

    • Often develop more than 400 miles apart.

    • Suggest that the jet stream is beginning to dissipate.

    • Are somewhat rare and usually occur either singly or in pairs.

    • Are formed during periods when the jet stream is well organized and the core exceeds 100kts.

    Correct Answer
    A. Suggest that the jet stream is beginning to dissipate.
    Explanation
    Located on page 1-37

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  • 9. 

    An increase of mass in a column of air will cause the surface pressure to

    • Increase.

    • Decrease.

    • Remain steady.

    • Do nothing, pressure is not affected by mass.

    Correct Answer
    A. Increase.
    Explanation
    When the mass of a column of air increases, it means that there is more air in that column. As a result, the air molecules become more densely packed, leading to an increase in pressure. This is because the weight of the additional air molecules exerts a greater force on the surface, causing the surface pressure to increase.

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  • 10. 

    When the central pressure of an anticyclone is rising, you can infer the anticyclone is

    • Filling.

    • Building.

    • Deepening.

    • Weakening.

    Correct Answer
    A. Building.
    Explanation
    When the central pressure of an anticyclone is rising, it indicates that the air in the anticyclone is becoming denser and sinking, which leads to the strengthening and expansion of the anticyclone. This process is known as building. Therefore, the correct answer is building.

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  • 11. 

    Unstable waves are classified as

    • Barotropic highs.

    • Barotropic lows.

    • Baroclinic high.

    • Baroclinic lows.

    Correct Answer
    A. Baroclinic lows.
    Explanation
    Unstable waves are classified as baroclinic lows. Baroclinic refers to the condition where there is a gradient in temperature or density within a fluid. In the case of unstable waves, there is a significant difference in temperature or density between adjacent air masses, leading to the formation of low-pressure systems. These baroclinic lows are characterized by strong vertical wind shear and can cause severe weather conditions such as storms and cyclones.

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  • 12. 

    In the life cycle of a low, the wave will reach its maximum intensity in the

    • Mature stage.

    • Dissipation stage.

    • Wave initiation stage.

    • Wave intensification stage.

    Correct Answer
    A. Mature stage.
    Explanation
    In the life cycle of a low, the wave will reach its maximum intensity in the mature stage. This is because during this stage, the low pressure system is fully developed and has reached its peak strength. The associated weather conditions, such as strong winds and heavy precipitation, are at their most intense during this stage. After the mature stage, the low pressure system will gradually weaken and dissipate. Therefore, the correct answer is the mature stage.

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  • 13. 

    What causes a surface high to build during the self-development process?

    • Negative vorticity advection.

    • Positive vorticity advection.

    • Convergence aloft.

    • Divergence aloft.

    Correct Answer
    A. Convergence aloft.
    Explanation
    During the self-development process, a surface high builds due to convergence aloft. Convergence aloft refers to the horizontal movement of air towards a central point in the upper levels of the atmosphere. This convergence leads to the sinking of air, which in turn creates high pressure at the surface. As air sinks, it warms and becomes denser, resulting in the formation of a high-pressure system. Therefore, convergence aloft is the cause of a surface high during the self-development process.

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  • 14. 

    The best way to distinguish stratocumulus from altocumulus clouds is to use

    • Movement.

    • Appearance.

    • The color of the elements.

    • The size of the elements.

    Correct Answer
    A. The size of the elements.
    Explanation
    The best way to distinguish stratocumulus from altocumulus clouds is by looking at the size of the elements. Stratocumulus clouds are characterized by larger, more rounded elements, while altocumulus clouds have smaller, more fragmented elements. By observing the size of the cloud elements, one can differentiate between these two cloud types.

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  • 15. 

    The distinguishing feature of any tornadic activity is

    • Intense thunderstorm activity.

    • Wind gusts over 35 knots in speed.

    • Cumulonimbus mammatus clouds.

    • The funnel-shaped appendage that hangs from the base of the cloud.

    Correct Answer
    A. The funnel-shaped appendage that hangs from the base of the cloud.
    Explanation
    Tornadic activity is characterized by the presence of a funnel-shaped appendage that hangs from the base of the cloud. This funnel-shaped appendage is commonly known as a tornado. It is formed when a rotating column of air extends from the base of a cumulonimbus cloud to the ground. This feature is distinct and easily recognizable, making it the distinguishing feature of tornadic activity. The other options, such as intense thunderstorm activity, wind gusts over 35 knots, and cumulonimbus mammatus clouds, may be associated with tornadic activity but are not unique to it.

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  • 16. 

    Above 13 miles, the radiation from the sun breaks down the oxygen in the atmosphere into

    • Ozone gas

    • Argon gas

    • Carbon dioxide

    • Gaseous nitrogen

    Correct Answer
    A. Ozone gas
    Explanation
    Located on page 1-4

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  • 17. 

    A high-pressure system undergoes anticyclolysis when the clockwise circulation area

    • Decreases or disappears.

    • Increases or disappears.

    • Decreases or forms.

    • Increases or forms.

    Correct Answer
    A. Decreases or disappears.
    Explanation
    Anticyclolysis refers to the dissipation or weakening of a high-pressure system. This occurs when the clockwise circulation area of the system decreases or disappears. In other words, the system loses its organized circulation pattern, resulting in a decrease or complete disappearance of the clockwise flow. This can happen due to various factors such as changes in atmospheric conditions or interactions with other weather systems.

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  • 18. 

    A thunderstorm officially ends

    • Ten minutes after the last occurrence of thunder, hail, or lightning.

    • Immediately after the last occurrence of thunder, hail, or lightning.

    • Fifteen minutes after the last occurrence of thunder, hail, or lightning.

    • Twenty minutes after the last occurrence of thunder, hail, or lightning.

    Correct Answer
    A. Fifteen minutes after the last occurrence of thunder, hail, or lightning.
    Explanation
    A thunderstorm officially ends fifteen minutes after the last occurrence of thunder, hail, or lightning. This means that once there is no more thunder, hail, or lightning activity for fifteen minutes, the storm is considered to be over. This time period allows for any potential lingering activity to completely dissipate before declaring the end of the storm.

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  • 19. 

    The three circulation cells in the three-cell circulation theory are

    • Subtropical, Hadley, and Ferrel.

    • Polar, subtropical, and Hadley.

    • Subtropical, polar, and Ferrel.

    • Polar, Hadley, and Ferrel.

    Correct Answer
    A. Polar, Hadley, and Ferrel.
    Explanation
    Located on page 1-13

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  • 20. 

    If you throw a ball towards a stationary target from the window of a speeding vehicle, coriolis force will cause the ball to miss the target

    • To the right.

    • To the left.

    • Downward.

    • Upward.

    Correct Answer
    A. To the right.
    Explanation
    Located on page 1-15

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  • 21. 

    The simplest method for locating the 500 millibar frontal zone is to

    • Locate the 500 millibar maximum wind band.

    • Locate the position of the -11° Centigrade isotherm

    • Locate the position of the -17° Centigrade isotherm

    • Find where the thermal concentration is more than 5° Centigrade in 200 miles.

    Correct Answer
    A. Locate the position of the -17° Centigrade isotherm
    Explanation
    Located on page 1-35

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  • 22. 

    What air mass calssification signifies an unstable, maritime tropical air mass that is colder than the surface it is moving over?

    • MTwu.

    • MTws.

    • MTku.

    • MTks.

    Correct Answer
    A. MTku.
    Explanation
    Located on page 1-51

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  • 23. 

    What air mass classification signifies a stable, continental polar air mass that is warmer than the surface it is moving over?

    • CPks.

    • CPws.

    • CTws.

    • CTku.

    Correct Answer
    A. CPws.
    Explanation
    Located on page 1-51

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  • 24. 

    It is winter. A cPk air mass is moving over the great lakes. In this situation, the southern shores of the Great Lakes will experience

    • Hail.

    • Heavy snow.

    • Thunderstorms.

    • Freezing precipitation.

    Correct Answer
    A. Heavy snow.
    Explanation
    Located on page 1-59

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  • 25. 

    Continental tropical air masses are usually associated with

    • Thermal lows.

    • Thermal highs.

    • Migratory lows.

    • Migratory highs.

    Correct Answer
    A. Thermal lows.
    Explanation
    Located on page 1-61

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  • 26. 

    The damper effect is comprised of upper-level

    • Divergence and surface low pressure.

    • Divergence and surface high pressure.

    • Convergence and surface low pressure.

    • Convergence and surface high pressure.

    Correct Answer
    A. Convergence and surface high pressure.
    Explanation
    The damper effect refers to a meteorological phenomenon where the convergence of air masses and the presence of high surface pressure result in the suppression or reduction of atmospheric motion. In this case, the correct answer is convergence and surface high pressure, as it accurately describes the conditions required for the damper effect to occur. When air masses converge and there is high pressure at the surface, it leads to stable atmospheric conditions and limits the vertical motion of air, dampening any potential disturbances or weather systems.

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  • 27. 

    A low-pressure system undergoing cyclogenesis is said to be

    • Dissipating or deepening.

    • Forming or deepening.

    • Dissipating or filling.

    • Forming or filling.

    Correct Answer
    A. Forming or deepening.
    Explanation
    When a low-pressure system undergoes cyclogenesis, it means that it is forming or intensifying. The term "forming" refers to the process of a low-pressure system developing and becoming more organized, while "deepening" indicates that the system is strengthening and the central pressure is decreasing. Therefore, the correct answer is "forming or deepening."

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  • 28. 

    In a warm frontal occlusion, the coldest air is found

    • Ahead of the cold front.

    • Behind the cold front.

    • Ahead of the warm front.

    • Behind the warm front.

    Correct Answer
    A. Ahead of the warm front.
    Explanation
    In a warm frontal occlusion, the coldest air is found ahead of the warm front. This is because warm frontal occlusions occur when a warm air mass moves into an area of colder air. As the warm air rises over the colder air, it cools and condenses, creating clouds and precipitation. The coldest air is typically found ahead of the warm front, where the warm air is still rising and the cold air is being pushed up and over it.

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  • 29. 

    Which high cloud classification is also referred to as a mackerel sky?

    • Cirrus-H4.

    • Cirrostratus-H6.

    • Cirrostratus-H7.

    • Cirrocumulus-H9.

    Correct Answer
    A. Cirrocumulus-H9.
    Explanation
    Cirrocumulus clouds are often referred to as a mackerel sky due to their appearance, which resembles the scales of a fish or the patterns on a mackerel. These clouds are high-level clouds, composed of small white or gray patches or ripples, and are usually seen in fair weather conditions. They are formed by the rising of moist air in the upper atmosphere, which then condenses and freezes into ice crystals, creating the distinct mackerel-like pattern. Therefore, Cirrocumulus-H9 is the correct answer.

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  • 30. 

    What type of precipitation might you observe with clear skies?

    • Snow.

    • Ice crystals.

    • Ice pellets.

    • Snow grains.

    Correct Answer
    A. Ice crystals.
    Explanation
    Clear skies typically indicate a lack of clouds, which means that there is little moisture in the air. In such conditions, it is unlikely to observe precipitation like snow, ice pellets, or snow grains, as these require the presence of clouds. However, ice crystals can still form in the atmosphere even without clouds, usually due to very cold temperatures. Therefore, ice crystals would be the most plausible type of precipitation to observe with clear skies.

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  • 31. 

    Precipitation is reported to the nearest

    • 0.001 of an inch.

    • 0.01 of an inch.

    • 0.10 of an inch.

    • 0.05 of an inch.

    Correct Answer
    A. 0.01 of an inch.
    Explanation
    Precipitation is reported to the nearest 0.01 of an inch. This means that when measuring the amount of precipitation, the value is rounded to the nearest hundredth of an inch. This level of precision allows for more accurate reporting of rainfall or snowfall measurements.

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  • 32. 

    Centrifugal force will increase when there is a decrease in

    • Mass.

    • Centripetal force.

    • The speed of rotation.

    • The radius of rotation.

    Correct Answer
    A. The radius of rotation.
    Explanation
    Located on page 1-15

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  • 33. 

    When an inactive front passes your station, the dew points will

    • Decrease slowly with the passage.

    • Decrease sharply with the passage.

    • Increase slowly with the passage.

    • Increase sharply with the passage.

    Correct Answer
    A. Decrease sharply with the passage.
    Explanation
    When an inactive front passes a station, the dew points decrease sharply with the passage. This is because an inactive front is associated with cooler air replacing warmer air. As the front moves through, the cooler air displaces the warmer air, causing the dew points to decrease rapidly.

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  • 34. 

    For observing purposes, five hydrometers are considered to be obstructions to vision. They include mist, fog, blowing snow,

    • Blowing spray, and blowing sand.

    • Freezing fog, and blowing sand.

    • Freezing fog, and blowing dust.

    • Freezing fog, and blowing spray.

    Correct Answer
    A. Freezing fog, and blowing spray.
    Explanation
    The correct answer is freezing fog and blowing spray. These two weather conditions, freezing fog and blowing spray, can obstruct vision and make it difficult to see clearly. Mist, fog, blowing snow, and blowing sand are also mentioned in the question, but they are not considered obstructions to vision.

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  • 35. 

    How many degrees centigrade does the temperature decrease per 1,000 meters of altitude in the troposphere?

    • 3.5

    • 4.5

    • 5.5

    • 6.5

    Correct Answer
    A. 6.5
    Explanation
    Located on page 1-3

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  • 36. 

    The driving mechanism that is mainly responsible for the earth's large-scale atmospheric circulations is the

    • Unequal heating of the earth.

    • Rotation of the earth.

    • Hadley cell.

    • Polar cell.

    Correct Answer
    A. Unequal heating of the earth.
    Explanation
    Located on page 1-12

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  • 37. 

    In relation to the jet core, the greatest vertical wind shear is usually located

    • Above the strongest horizontal shear.

    • Below the strongest horizontal shear.

    • Above the jet core.

    • Below the jet core.

    Correct Answer
    A. Above the jet core.
    Explanation
    located on page 1-32

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  • 38. 

    What factors must a region possess in order to facilitate air mass formation?

    • Uniform surface, stagnant air, and large-scale difluent flow.

    • Must be over water, stagnant air, and large-scale difluent flow.

    • Any nonuniform surface, stagnant air, and large-scale difluent flow.

    • Must be over smooth land, stagnant air, and large-scale difluent flow.

    Correct Answer
    A. Uniform surface, stagnant air, and large-scale difluent flow.
    Explanation
    Located on page 1-49

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  • 39. 

    With the passage of a cold front in the Northern Hemisphere, the horizontal wind direction will

    • Become more variable.

    • Become more northeasterly.

    • Shift in a clockwise direction.

    • Shift in a counterclockwise direction.

    Correct Answer
    A. Shift in a clockwise direction.
    Explanation
    When a cold front passes through the Northern Hemisphere, the wind direction shifts in a clockwise direction. This is because cold fronts typically bring cooler air from the north, which causes the wind to rotate in a clockwise direction around the low-pressure system associated with the front. As the cold air replaces the warm air, the wind shifts from its previous direction to a more clockwise direction.

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  • 40. 

    In a cold occlusion, the coldest air is found

    • Behind the cold front.

    • Behind the warm front.

    • Ahead of the cold front.

    • Ahead of the warm front.

    Correct Answer
    A. Behind the cold front.
    Explanation
    In a cold occlusion, the coldest air is found behind the cold front. This is because in a cold occlusion, a cold front overtakes a warm front, causing the colder air to push underneath the warmer air. As the cold front moves forward, it brings the coldest air with it, creating a boundary between the colder air behind the front and the warmer air ahead of it. Therefore, the coldest air is located behind the cold front in a cold occlusion.

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  • 41. 

    The  most desirable night-visibility markers are

    • Unfocused lights.

    • Dark-colored objects.

    • Light-colored objects.

    • Focused high-intensity lights.

    Correct Answer
    A. Unfocused lights.
    Explanation
    Unfocused lights are the most desirable night-visibility markers because they provide a broader and more diffuse illumination, which helps to enhance visibility in low light conditions. Unlike focused high-intensity lights that have a narrow beam, unfocused lights spread the light over a wider area, making it easier to see and be seen in the dark. Dark-colored objects may blend into the background and be difficult to distinguish, while light-colored objects may not provide enough contrast in low light situations. Therefore, unfocused lights are the best option for maximizing visibility at night.

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  • 42. 

    The three main forms of precipitation are liquid,

    • Frozen, and round.

    • Freezing, and mixed.

    • Freezing, and frozen.

    • Freezing, and gaseous.

    Correct Answer
    A. Freezing, and frozen.
    Explanation
    The correct answer is "freezing, and frozen." This answer accurately identifies the two main forms of precipitation. Freezing refers to when precipitation falls as liquid but freezes upon contact with a surface, such as freezing rain or freezing drizzle. Frozen refers to precipitation that falls in the form of ice crystals, such as snow or hail.

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  • 43. 

    Which type of obstruction to vision is classified as a lithometer?

    • Fog.

    • Ash.

    • Smoke.

    • Spray.

    Correct Answer
    A. Smoke.
    Explanation
    A lithometer is a device used to measure the opacity or density of smoke. Therefore, smoke is classified as a lithometer because it obstructs vision and can be measured using this device. Fog, ash, and spray are not specifically classified as lithometers, although they can also obstruct vision.

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  • 44. 

    Which is a calculated sea-level pressure in inches of mercury?

    • Station pressure.

    • Altimeter setting.

    • Sea-level pressure.

    • Corrected aneroid reading.

    Correct Answer
    A. Altimeter setting.
    Explanation
    The altimeter setting is a calculated sea-level pressure in inches of mercury. It is used to adjust the altimeter reading to reflect the current atmospheric pressure at sea level, allowing for accurate altitude measurements. The altimeter setting takes into account factors such as temperature and humidity to provide a standardized pressure reference for pilots and meteorologists.

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  • 45. 

    Wind observing equipment is oriented to

    • True north.

    • True south.

    • Magnetic north.

    • Magnetic south.

    Correct Answer
    A. Magnetic north.
    Explanation
    Wind observing equipment is oriented to magnetic north because the Earth's magnetic field affects the direction of the wind. Magnetic north is the direction towards the Earth's magnetic north pole, which is slightly different from true north. By aligning the equipment with magnetic north, it allows for accurate measurement and recording of wind direction relative to the Earth's magnetic field. This is important for various applications such as weather forecasting, aviation, and navigation.

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  • 46. 

    Which force is the "equal and opposite reaction" to the center-seeking force?

    • Inertia.

    • Coriolis.

    • Centrifugal.

    • Centripetal.

    Correct Answer
    A. Centrifugal.
    Explanation
    Located on page 1-14

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  • 47. 

    The jet core that is located between the midlatitude and the tropical tropoause's is called the

    • Tropical jet.

    • Subtropical jet.

    • Polar-front jet.

    • Midlatitude jet.

    Correct Answer
    A. Subtropical jet.
    Explanation
    Located on page 1-35

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  • 48. 

    Anticyclogenesis typically occurs at, and just downstream from, long-wave

    • Ridges under difluent flow aloft.

    • Troughs under difluent flow aloft.

    • Ridges under confluent flow aloft.

    • Troughs under confluent flow aloft.

    Correct Answer
    A. Ridges under confluent flow aloft.
    Explanation
    Anticyclogenesis refers to the formation of an anticyclone, which is a high-pressure system characterized by descending air and clockwise rotation in the Northern Hemisphere. This process typically occurs at, and just downstream from, long-wave ridges. Confluent flow aloft refers to the convergence of air masses, where the wind flow comes together. In the context of anticyclogenesis, ridges under confluent flow aloft create favorable conditions for the development of high-pressure systems. Therefore, the correct answer is "ridges under confluent flow aloft."

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  • 49. 

    What color balloon would you use to determine the ceiling heights of thin clouds?

    • Red.

    • Blue.

    • Black.

    • Yellow.

    Correct Answer
    A. Red.
    Explanation
    Red is the correct answer because red light has a longer wavelength compared to other colors, making it less likely to be scattered by small particles in the atmosphere. This allows red light to penetrate thin clouds more effectively, making it easier to determine the height of the cloud ceiling.

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Quiz Review Timeline (Updated): Mar 11, 2024 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 11, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • Oct 22, 2012
    Quiz Created by
    USAFWX

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