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Q90 (CDS-I/2006) Geography › World Physical Geography › Atmospheric pressure winds Answer Verified

Consider the following statements: 1. Sudden storms and strong winds are the characteristics of equatorial low pressure area. 2. Westerly jet streams are seen in northern hemisphere only. Which of the statements given above is/ are correct ?

Result
Your answer: —  Â·  Correct: D
Explanation

Statement 1 is incorrect because the equatorial low-pressure area, also known as the ITCZ or the doldrums, is characterized by weak prevailing winds and unusually calm weather rather than sudden storms and strong winds [t5]. While it features convective activity and vigorous thunderstorms due to rising air, the surface winds are generally light and variable [t3][t10]. Statement 2 is incorrect because westerly jet streams, including both the polar and subtropical jets, are present in both the Northern and Southern Hemispheres [c1][t2]. These powerful eastward-flowing air currents encircle the globe in both hemispheres at heights of 10–15 km, driven by temperature gradients between the tropics and the poles [t3][t4]. In the Southern Hemisphere, the subtropical jet is even more persistent, existing throughout the year, whereas it can be intermittent in the Northern Hemisphere during summer [c4].

Sources

  1. [1] https://education.nationalgeographic.org/resource/wind/
  2. [2] https://www.sciencedirect.com/topics/earth-and-planetary-sciences/jet-stream
  3. [3] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 27: Jet streams > Upper Tropospheric Westerlies > p. 385
  4. [4] https://www.met.reading.ac.uk/~williams/publications/3-s2.0-B9780128215753000153-main.pdf
  5. [5] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 27: Jet streams > Subtropical Jet Stream (STJ) > p. 387
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SIMILAR QUESTIONS

NDA-I · 2018 · Q27 Relevance score: 3.35

Consider the following statements : 1. The doldrums is a low pressure area around Equator where the prevailing winds are calm. 2. Chinook is a hot and dry wind that blows in winter and therefore raises the temperature in a short time. Which of the statements given above is/are correct?

IAS · 2020 · Q9 Relevance score: 2.91

Consider the following statements : 1. Jet streams occur in the Northern Hemisphere only. 2. Only some cyclones develop an eye. 3. The temperature inside the eye of a cyclone is nearly 10℃ lesser than that of the surroundings. Which of the statements given above is/are correct ?

NDA-I · 2018 · Q26 Relevance score: 2.38

Consider the following statements about Roaring Forties : 1. They are strong Westerly winds found in the oceans of Southern Hemisphere. 2. The strong east to west air cuirents are caused by the combination of air being displaced from the Equator towards the South Pole and the earth’s rotation and abundance of landmasses to serve as wind breaks. Which of the statements given above is/are correct ?

CDS-I · 2008 · Q7 Relevance score: 1.47

Consider the following statements : The South-West Monsoon originates in India due to 1. low pressure in the Punjab plain 2. high pressure in areas South of India 3. equatorial low being filled up by descending air current 4. the Himalayas Which of the statements given above are correct?

CDS-II · 2007 · Q94 Relevance score: 1.47

Consider the following statements: The South-West Monsoon originates in India due to 1. low pressure in the Punjab plain 2. high pressure in areas South of India 3. equatorial low being filled up by descending air current 4. the Himalayas Which of the statements given above are correct?