Air Masses

Options:

1. T. Bergeron and J. Bjerknes
2. V. Bjerknes and J. Bjerknes
3. J.E. Oliver and J.J. Hidoie
4. A.N. Strahler and A.H. Strahler

Correct Answer

Options:

1. A large, horizontal, homogeneous body of air that may cover thousands of square kilometers and extend upward for thousands of meters.
2. A body of air in which the upward gradients of temperature and moisture are fairly uniform over a large area.
3. An air mass is a large body of air whose physical properties, especially temperature, moisture content, and lapse rate (of temperature), are more or less homogeneous horizontally.
4. None of the above.

Correct Answer

Options:

1. For studying the relationship between air circulation, weather types, and climatic regional differences.
2. For studying the importance of large-scale atmospheric circulation involving both horizontal and vertical components.
3. For weather forecasting.
4. None of the above.

Correct Answer

Options:

1. T. Bergeron, J. Bjerknes and Solberg
2. A.N. Strahler and A.H. Strahler
3. J.E. Oliver and J.J. Hidoie
4. None of the above.

Correct Answer

Options:

1. Synoptic climatology emphasises the relationships among air circulation, weather types, and climatic regional differences.
2. Air mass is a study of climates in relation to atmospheric circulations.
3. Both a and b.
4. None of the above.

Correct Answer

Options:

1. The air mass covers too small of an area.
2. The air mass spreads over a heterogeneous topographic area.
3. The air mass is too thin in the vertical dimension.
4. The properties of the air mass are uniform regardless of the location.

Correct Answer

Options:

1. Wind direction and cloud cover
2. Humidity and wind speed
3. Vertical temperature distribution and moisture content
4. Air pressure and precipitation

Correct Answer

Options:

1. The temperature of the underlying surface
2. The height of the air mass in the atmosphere
3. The direction of the air mass movement
4. The humidity of the air mass

Correct Answer

Options:

1. Divergence zone
2. Convergence point
3. Front
4. Interchange boundary

Correct Answer

Options:

1. Extensive and non-homogeneous earth’s surface and convergence of air flow
2. Extensive and homogeneous earth’s surface and convergence of air flow
3. Extensive and non-homogeneous earth’s surface and divergence of air flow
4. Extensive and homogeneous earth’s surface and divergence of air flow

Correct Answer

Options:

1. The nature of vertical distribution of temperature
2. The moisture content of the air
3. The properties of the source area and direction of movement
4. The age of the air mass

Correct Answer

Options:

1. When its temperature is less than the temperature of the underlying surface
2. When its temperature is higher than the underlying ground surface
3. When it originates over a land surface
4. When it forms over an ocean surface

Correct Answer

Options:

1. The nature and properties of source regions
2. The distance covered by the air mass after its movement from the source region
3. The local conditions of the areas visited by the air mass
4. The age of the air mass

Correct Answer

Options:

1. Nature of surface
2. Latitude
3. Time spent by air mass in the region
4. Convergence or divergence of air

Correct Answer

Options:

1. Polar oceanic areas
2. Equatorial regions
3. Mediterranean Sea
4. Tropical continental areas

Correct Answer

Options:

1. Equatorial, tropical, temperate, arctic
2. Equatorial, tropical, polar, subpolar
3. Continental, maritime
4. Primary, secondary

Correct Answer

Options:

1. Thermodynamic and mechanical
2. Continental and maritime
3. Primary and secondary
4. Equatorial and polar

Correct Answer

Options:

1. Wind velocity
2. Subsidence of air from above
3. Heating or cooling from below
4. Mechanical mixing

Correct Answer

Options:

1. Initial temperature, nature of surface, time taken, and precipitation
2. Initial temperature, nature of surface, path followed, and time taken
3. Initial moisture content, nature of surface, time taken, and precipitation
4. Initial temperature, nature of surface, path followed, and precipitation

Correct Answer

Options:

1. It becomes unstable and can cause precipitation
2. It becomes stable and cannot cause precipitation
3. It remains unchanged
4. It becomes unpredictable

Correct Answer