Question 1

On an upper-level chart, which of the following is generally associated with a centre of surface low pressure?

Accepted Answer

A surface low pressure is characterized by a trough, which is an elongated area of low pressure. Convergence, zonal flow and ridges are not typically associated with a centre of surface low pressure.

Question 2

What is the direction of the pressure gradient force during a reversible adiabatic process, in relation to the isobars?

Accepted Answer

During a reversible adiabatic process, the pressure gradient force is parallel to the isobars. This is because the adiabatic process involves the compression and expansion of air without any exchange of heat. As a result, the temperature changes are directly related to the pressure changes, and the pressure gradient force acts in the same direction as the change in pressure, which is parallel to the isobars.

Question 3

Which of the following is the unit of pressure most commonly found on a surface weather map?

Accepted Answer

Hectopascals (hPa) are the most commonly used unit of pressure on a surface weather map, especially in international weather reports. The United States still uses inches of mercury (inHg) as a secondary unit of pressure, but hectopascals are becoming more widely used. The other options, atmospheres and pounds per square inch, are not commonly used in meteorology.

Question 4

The solid line indicates the 850 mb pressure level, and points A and B are at the same altitude.
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​ 
-Which of the following describes the temperature of the air at point A compared to the air at point B?

Accepted Answer

Without specific details about points A and B, the general principle in meteorology is that temperature variations can occur due to factors like altitude, geographical location, time of day, and atmospheric conditions. Without context, it's impossible to accurately determine the temperature difference between two points. However, if this question is based on a common understanding or specific scenario where point A is known or assumed to be warmer (e.g., due to its position relative to the sun, lower altitude, or any other given condition), then A could be considered correct. Yet, without context, this answer is speculative.

Question 5

Which of the following factors generates the Coriolis force?

Accepted Answer

The Coriolis force is generated by the rotating Earth. As the Earth rotates, its surface moves faster at the equator than at the poles, and this difference in speed causes a deflection of objects or fluids (such as air and water) moving over the surface. This deflection is known as the Coriolis force.

Question 6

The solid line indicates the 850 mb pressure level, and points A and B are at the same altitude.
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​ 
-Which of the following terms refers to the amount of pressure change that occurs over a given horizontal distance?

Accepted Answer

The term that refers to the amount of pressure change that occurs over a given horizontal distance is the pressure gradient. It is the change in pressure across a surface, divided by the distance perpendicular to the surface over which the pressure change occurs.

Question 7

Equilibrium between which of the following factors is described by the hydrostatic equation?

Accepted Answer

The hydrostatic equation describes the equilibrium between the vertical pressure gradient force and gravity. It explains how the pressure changes with height in the atmosphere and how this influences the vertical motion of air parcels. Friction force, Coriolis force, and horizontal pressure gradient force are not directly related to the hydrostatic equation.

Question 8

Given the equation for geostrophic wind is  , which of the following will increase the wind speed?

Accepted Answer

The answer of Given the equation for geostrophic wind is...

Question 9

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-Consider the scenario in which a pilot is flying from warm air into cooler air, but the altimeter indicates the same altitude in the cold air as is did in the warm air. Which of the following describes the altitude of the plane?

Accepted Answer

When flying from warm air into cooler air, the air density increases. If the altimeter indicates the same altitude, the plane is actually flying at a lower altitude than before because the pressure levels corresponding to a given altitude are reached at lower physical heights in cooler air.

Question 10

The spacing of the height contours on an isobaric weather chart indicates the magnitude of which of the following?

Accepted Answer

The spacing of the height contours on an isobaric weather chart indicates the magnitude of the pressure gradient force, which is responsible for the acceleration of air from higher pressure to lower pressure. The closer the height contours are on the chart, the stronger the pressure gradient force and the faster the wind speeds will be. The Coriolis force, frictional force, and centripetal force are not reflected in the spacing of height contours on an isobaric chart.

Question 11

The solid line indicates the 850 mb pressure level, and points A and B are at the same altitude.
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​ 
-Which of the following describes what contour lines represent on a 500 hPa chart?

Accepted Answer

Contour lines on a 500 hPa chart represent lines of constant altitude.

Question 12

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-In which side is there more air between 0 and 1.5 km altitude?

Accepted Answer

The air density decreases with altitude. So, there is more air between 0 and 1.5 km altitude on the right side.

Question 13

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-Which of the following is the source of the expression "the force exerted on an object equals its mass times the acceleration produced"?

Accepted Answer

Newton's second law of motion, also known as the law of acceleration, states that the force exerted on an object is equal to its mass times the acceleration produced.

Question 14

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-Which of the following air motions at pressure centres is correct?

Accepted Answer

Air rises at low-pressure centres because there is less atmospheric pressure pushing down on the air, allowing it to rise. Conversely, at high-pressure centers there is more atmospheric pressure pushing down on the air, causing it to sink towards the Earth's surface. Thus, air rises at low-pressure centers and sinks at high-pressure centers.

Question 15

In which of the following places is the pressure gradient force directed from high to low pressure?

Accepted Answer

The pressure gradient force is always directed from high to low pressure, regardless of location on Earth or hemisphere. Therefore, choice B is the correct answer.

Question 16

Which of the following describes the air at the surface around a strengthening low-pressure area, and aloft, above the system?

Accepted Answer

In a strengthening low-pressure system, air at the surface will converge towards the center of the low-pressure area due to the lower air pressure. Conversely, aloft, above the system, the air will diverge away from the center of the low-pressure area due to the rising air from the surface. Therefore, the correct choice is D, as air converges at the surface and diverges aloft.

Question 17

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-A stationary air parcel in the northern hemisphere begins to move in which of the following directions?

Accepted Answer

In the northern hemisphere, the Coriolis effect deflects moving objects to the right. Therefore, a stationary air parcel that begins to move will be deflected to the right, which is to the west.

Question 18

The solid line indicates the 850 mb pressure level, and points A and B are at the same altitude.
​
​ 
-Which of the following corresponds to low pressures observed on a constant height chart?

Accepted Answer

Low pressures observed on a constant height chart correspond to low heights on a constant pressure chart. This is because at locations where the pressure is lower at a given altitude (height), the air above it must also be less dense or have less mass, resulting in lower heights on a constant pressure chart.

Question 19

To accurately monitor horizontal changes in air pressure, a correction for which of the following factors is most important for a mercury barometer?

Accepted Answer

Altitude is the most important factor to correct for in a mercury barometer when monitoring horizontal changes in air pressure, as it affects the baseline pressure reading due to changes in atmospheric pressure with elevation.

Question 20

Which of the following statements describes what a barograph does?

Accepted Answer

A barograph is an instrument used to measure and record changes in atmospheric pressure over time. It consists of a sealed container with a vacuum inside, and a stylus that is connected to a mechanism that moves up and down in response to changes in pressure. As the stylus moves, it records the changes on a paper chart, allowing for the measurement and tracking of changes in pressure over time.

Quiz 8: Air Pressure and Winds

On an upper-level chart, which of the following is generally associated with a centre of surface low pressure?

What is the direction of the pressure gradient force during a reversible adiabatic process, in relation to the isobars?

Which of the following is the unit of pressure most commonly found on a surface weather map?

The solid line indicates the 850 mb pressure level, and points A and B are at the same altitude. -Which of the following describes the temperature of the air at point A compared to the air at point B?

Which of the following factors generates the Coriolis force?

The solid line indicates the 850 mb pressure level, and points A and B are at the same altitude. -Which of the following terms refers to the amount of pressure change that occurs over a given horizontal distance?

Equilibrium between which of the following factors is described by the hydrostatic equation?

Given the equation for geostrophic wind is , which of the following will increase the wind speed?

-Consider the scenario in which a pilot is flying from warm air into cooler air, but the altimeter indicates the same altitude in the cold air as is did in the warm air. Which of the following describes the altitude of the plane?

The spacing of the height contours on an isobaric weather chart indicates the magnitude of which of the following?

The solid line indicates the 850 mb pressure level, and points A and B are at the same altitude. -Which of the following describes what contour lines represent on a 500 hPa chart?

-In which side is there more air between 0 and 1.5 km altitude?

-Which of the following is the source of the expression "the force exerted on an object equals its mass times the acceleration produced"?

-Which of the following air motions at pressure centres is correct?

In which of the following places is the pressure gradient force directed from high to low pressure?

Which of the following describes the air at the surface around a strengthening low-pressure area, and aloft, above the system?

-A stationary air parcel in the northern hemisphere begins to move in which of the following directions?

The solid line indicates the 850 mb pressure level, and points A and B are at the same altitude. -Which of the following corresponds to low pressures observed on a constant height chart?

To accurately monitor horizontal changes in air pressure, a correction for which of the following factors is most important for a mercury barometer?

Which of the following statements describes what a barograph does?

Quiz 8: Air Pressure and Winds

On an upper-level chart, which of the following is generally associated with a centre of surface low pressure?

What is the direction of the pressure gradient force during a reversible adiabatic process, in relation to the isobars?

Which of the following is the unit of pressure most commonly found on a surface weather map?

The solid line indicates the 850 mb pressure level, and points A and B are at the same altitude. ​ ​ -Which of the following describes the temperature of the air at point A compared to the air at point B?

Which of the following factors generates the Coriolis force?

The solid line indicates the 850 mb pressure level, and points A and B are at the same altitude. ​ ​ -Which of the following terms refers to the amount of pressure change that occurs over a given horizontal distance?

Equilibrium between which of the following factors is described by the hydrostatic equation?

Given the equation for geostrophic wind is , which of the following will increase the wind speed?

​ -Consider the scenario in which a pilot is flying from warm air into cooler air, but the altimeter indicates the same altitude in the cold air as is did in the warm air. Which of the following describes the altitude of the plane?

The spacing of the height contours on an isobaric weather chart indicates the magnitude of which of the following?

The solid line indicates the 850 mb pressure level, and points A and B are at the same altitude. ​ ​ -Which of the following describes what contour lines represent on a 500 hPa chart?

​ -In which side is there more air between 0 and 1.5 km altitude?

​ -Which of the following is the source of the expression "the force exerted on an object equals its mass times the acceleration produced"?

​ -Which of the following air motions at pressure centres is correct?

In which of the following places is the pressure gradient force directed from high to low pressure?

Which of the following describes the air at the surface around a strengthening low-pressure area, and aloft, above the system?

​ -A stationary air parcel in the northern hemisphere begins to move in which of the following directions?

The solid line indicates the 850 mb pressure level, and points A and B are at the same altitude. ​ ​ -Which of the following corresponds to low pressures observed on a constant height chart?

To accurately monitor horizontal changes in air pressure, a correction for which of the following factors is most important for a mercury barometer?

Which of the following statements describes what a barograph does?

The solid line indicates the 850 mb pressure level, and points A and B are at the same altitude. -Which of the following describes the temperature of the air at point A compared to the air at point B?

The solid line indicates the 850 mb pressure level, and points A and B are at the same altitude. -Which of the following terms refers to the amount of pressure change that occurs over a given horizontal distance?

-Consider the scenario in which a pilot is flying from warm air into cooler air, but the altimeter indicates the same altitude in the cold air as is did in the warm air. Which of the following describes the altitude of the plane?

The solid line indicates the 850 mb pressure level, and points A and B are at the same altitude. -Which of the following describes what contour lines represent on a 500 hPa chart?

-In which side is there more air between 0 and 1.5 km altitude?

-Which of the following is the source of the expression "the force exerted on an object equals its mass times the acceleration produced"?

-Which of the following air motions at pressure centres is correct?

-A stationary air parcel in the northern hemisphere begins to move in which of the following directions?

The solid line indicates the 850 mb pressure level, and points A and B are at the same altitude. -Which of the following corresponds to low pressures observed on a constant height chart?