Fri. Jan 10th, 2025

Air Masses

  1. What type of air mass is created when warm air moves to colder surfaces?

    Options:
    1. Cold air mass
    2. Warm air mass
    3. Stable air mass
    4. Unstable air mass

    Option: C

  2. Which type of modification of air mass involves upward or downward movement of air?

    Options:
    1. Thermodynamic modification
    2. Mechanical modification
    3. Geographical modification
    4. Temperature modification

    Option: B

  3. What type of air mass is created when air descends?

    Options:
    1. Cold air mass
    2. Warm air mass
    3. Stable air mass
    4. Unstable air mass

    Option: C

  4. The basis of geographical classification of air masses is

    Options:
    1. Humidity of the source region
    2. Lapse rate of the source region
    3. Temperature of the source region
    4. Pressure of the source region

    Option: C

  5. What are the two approaches to the classification of air masses?

    Options:
    1. Temperature classification and pressure classification
    2. Geographical classification and thermodynamic classification
    3. Humidity classification and wind classification
    4. Stability classification and instability classification

    Option: B

  6. What are the two broad categories of air masses based on their geographical locations?

    Options:
    1. Equatorial and Arctic
    2. Polar and Tropical
    3. Continental and Maritime
    4. Dynamic and Thermodynamic

    Option: B

  7. Which type of air mass is indicated by a small letter “m”?

    Options:
    1. Maritime
    2. Continental
    3. Polar
    4. Tropical

    Option: A

  8. Which of the following air masses is seldom transformed into continental type while passing through land surface?

    Options:
    1. Continental polar airmass
    2. Maritime polar air mass
    3. Continental tropical airmass
    4. Maritime tropical air mass

    Option: D

  9. What are the two types of air masses based on the nature of the surface of the source regions?

    Options:
    1. Polar and tropical
    2. Continental and oceanic
    3. Cold and warm
    4. Stable and unstable

    Option: B

  10. The four principal types of air masses classified based on their geographical locations are

    Options:
    1. Continental polar, maritime polar, continental tropical, and maritime tropical
    2. Equatorial, polar, continental, and maritime
    3. Warm, cold, stable, and unstable
    4. Arctic, tropical, continental, and maritime

    Option: A

  11. Which type of air mass is cooled from below and becomes stable due to which its vertical movement stops?

    Options:
    1. Continental cold air mass
    2. Maritime cold air mass
    3. Continental warm air mass
    4. Maritime warm air mass

    Option: C

  12. How many types of air masses are there based on thermodynamic and mechanical modifications, and some other considerations?

    Options:
    1. 2
    2. 4
    3. 8
    4. 16

    Option: D

  13. The properties of cold air masses in their source regions are

    Options:
    1. High temperature and specific humidity
    2. Low temperature and specific humidity
    3. High temperature and stability
    4. Low temperature and stability

    Option: B

  14. What causes convective currents in a cold air mass after it moves out from its source region?

    Options:
    1. Cooling from below
    2. Loss of heat through outgoing longwave terrestrial radiation
    3. Increased stability and normal lapse rate
    4. Warming from below and increased normal lapse rate

    Option: D

  15. When does precipitation occur in a cold air mass?

    Options:
    1. When it lies over warm ocean surface
    2. When it lies over warm continent
    3. When it lies over cold ocean surface
    4. When it lies over cold continent

    Option: A

  16. Which of the following is not a major air mass?

    Options:
    1. Continental Tropical Air Mass (cT)
    2. Maritime Tropical Air Mass (mT)
    3. Polar Continental Air Mass (cP)
    4. Polar Tropical Air Mass (pT)

    Option: D

  17. Which type of air mass originates from central Canada and Siberia and is generally cold and dry?

    Options:
    1. Continental Tropical Air Mass (cT)
    2. Maritime Tropical Air Mass (mT)
    3. Polar Continental Air Mass (cP)
    4. Polar Maritime Air Mass (mP)

    Option: C

  18. Which of the following statements is true about continental polar air masses in summer?

    Options:
    1. They are warm and moist.
    2. They are cool and dry.
    3. They bring extreme heat waves.
    4. They originate over warm surfaces.

    Option: B

  19. Which type of air mass results from the modification of continental polar air masses over oceanic surfaces of high latitudes?

    Options:
    1. Continental Tropical Air Mass (cT)
    2. Maritime Tropical Air Mass (mT)
    3. Polar Continental Air Mass (cP)
    4. Polar Maritime Air Mass (mP)

    Option: D

  20. What happens to maritime polar air masses when they strike mountain barriers?

    Options:
    1. They become stable and dry.
    2. They become unstable and produce precipitation on the windward slopes.
    3. They become warm and moist.
    4. They become dry and relatively warmer on the leeward slopes.

    Option: B