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Q61 (NDA-II/2015) Geography › World Physical Geography › Atmospheric pressure winds Answer Verified

Which one of the following pairs of properties of typical air masses is correct? Air Mass Source Region

Result
Your answer: —  Â·  Correct: A
Explanation

Air masses are classified based on their source regions, which determine their temperature and moisture characteristics. The first letter of the classification indicates moisture: 'm' for maritime (moist/oceanic) and 'c' for continental (dry/land) [2]. The second letter indicates temperature: 'T' for Tropical (warm), 'P' for Polar (cold), and 'E' for Equatorial (very warm) [3]. Maritime air masses originate over oceans and are characterized by high humidity [2]. Specifically, Maritime Tropical (mT) or Maritime Equatorial air masses form over warm oceans in the tropical or equatorial zones, making them warm and moist [4]. Option 2 is incorrect because Maritime Polar air masses form over cold high-latitude oceans, not warm tropical ones [3]. Options 3 and 4 are incorrect because 'Continental' air masses originate over land and are typically dry, not over oceans [2].

Sources

  1. [2] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 28: Temperate Cyclones > Air Masses Based On Source Regions > p. 396
  2. [3] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 28: Temperate Cyclones > Maritime Polar Air Masses (mP) > p. 397
  3. [1] FUNDAMENTALS OF PHYSICAL GEOGRAPHY, Geography Class XI (NCERT 2025 ed.) > Chapter 9: Atmospheric Circulation and Weather Systems > Air Masses > p. 81
  4. [4] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 28: Temperate Cyclones > Source Regions > p. 395
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