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Q57 (NDA-II/2011) Geography › World Physical Geography › Atmospheric pressure winds Answer Verified

Which of the following statements is/are correct? I. Cyclone is a low pressure system. 2. The wind movement is clockwise in the cyclone of northern hemisphere. Select the correct answer using the code, given below :

Result
Your answer: —  Â·  Correct: A
Explanation

A cyclone is defined as a meteorological system characterized by a central area of low atmospheric pressure [t2][t6]. Statement 1 is correct because air naturally flows from high-pressure surroundings toward this low-pressure center [t5][t9]. Statement 2 is incorrect because of the Coriolis effect, which deflects moving air to the right in the Northern Hemisphere [c2][t8]. This deflection causes the inward-flowing winds to spiral in a counterclockwise (anti-clockwise) direction around the low-pressure center in the Northern Hemisphere [c3][c5][t1]. Clockwise rotation for a cyclone only occurs in the Southern Hemisphere [t2][t6]. In the Northern Hemisphere, clockwise rotation is characteristic of an anticyclone, which is a high-pressure system [t4][t7]. Therefore, only the first statement regarding the low-pressure nature of a cyclone is accurate.

Sources

  1. [1] https://www.hko.gov.hk/en/education/tropical-cyclone/intensity/00150-why-do-tropical-cyclones-always-form-more-than-5-degrees-of-latitude-away-from-the-equator.html
  2. [2] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 23: Pressure Systems and Wind System > Why Tropical Cyclones Do Not Form At The Equator? > p. 310
  3. [3] https://oceanservice.noaa.gov/education/tutorial_currents/04currents1.html
  4. [4] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 26: Tropical Cyclones > Convective Cyclogenesis Mechanism – Mature stage > p. 366
  5. [5] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 4: Climate of India > TROPICAL CYCLONES > p. 27
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SIMILAR QUESTIONS

NDA-II · 2010 · Q5 Relevance score: 5.61

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CDS-I · 2006 · Q90 Relevance score: 4.04

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