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Q67 (CDS-II/2010) Geography › World Physical Geography › Atmospheric pressure winds Answer Verified

Consider the following statements : 1. A hurricane acquires its spin, from the coriolis effect. 2. The diameter of the hurricane decreases as it, moves away from low latitudes, 3. The diameter of a hurricane is never below 150 km. Which of the statements given above is /are correct ?

Result
Your answer: —  Â·  Correct: A
Explanation

Statement 1 is correct as hurricanes acquire their cyclonic spin from the Coriolis effect, which deflects moving air to the right in the Northern Hemisphere and left in the Southern Hemisphere, creating a vortex [t2][t5][t8]. Statement 2 is incorrect; while hurricanes follow curved paths toward higher latitudes due to the Coriolis force (beta effect), their diameter generally increases rather than decreases as they move away from low latitudes and expand [c1][t7]. Statement 3 is incorrect because, although typical tropical cyclones have diameters ranging from 150 to 500 km [c4], the term 'hurricane' refers to the intensity (wind speed) rather than a fixed minimum size. Smaller systems like 'midget' tropical cyclones can exist with diameters significantly below 150 km, and the 150 km figure is a general characteristic rather than a strict physical lower limit [c3][c4].

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] https://education.nationalgeographic.org/resource/coriolis-effect-1/
  3. [3] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 26: Tropical Cyclones > 26.4. Path of Tropical Cyclones > p. 371
  4. [4] Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 8: Natural Hazards and Disaster Management > Tropical Cyclones > p. 46
  5. [5] INDIA PHYSICAL ENVIRONMENT, Geography Class XI (NCERT 2025 ed.) > Chapter 6: Natural Hazards and Disasters > Tropical Cyclone > p. 59
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SIMILAR QUESTIONS

CDS-I · 2012 · Q72 Relevance score: 3.10

Consider the following state- ments : 1. Coriolis effect is zero at the Equator. 2. Coriolis effect is more towards the Poles. 3. Coriolis effects are related to the decreasing rotational velocity with increasing latitudes. 4. Coriolis effects are related to the increasing rotational velocity with increasing latitudes. Which of the statements given above are correct ?

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With reference to "Coriolis force", which of the following statements is/are correct ? 1. It increases with increase in wind velocity. 2. It is maximum at the poles and is absent at the equator. Select the answer using the code given below :

CDS-I · 2021 · Q17 Relevance score: 1.07

Which one of the following statements about the Coriolis force is not correct ?

NDA-I · 2025 · Q91 Relevance score: 0.79

Which of the following statements with reference to Coriolis force is/are correct ? 1. Coriolis force acts perpendicular to the pressure gradient force 2. At the equator, the Coriolis force is zero and the wind blows perpendicular to the isobars Select the answer using the code given below :

CAPF · 2018 · Q51 Relevance score: 0.69

Which of the following statements about tropical cyclone are correct? 1. It originates and develops over warm oceanic surface. 2. Presence of Coriolis force is necesBajy for it. 3. It occurs in middle latitudinal region* 4. It develops ‘eye’ with calm and descending air condition. Select the correct answer using the code given below.