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Q72 (CDS-I/2012) Geography › World Physical Geography › Atmospheric pressure winds Answer Verified

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 ?

Result
Your answer: —  Â·  Correct: A
Explanation

The Coriolis effect is a consequence of Earth's rotation, where the magnitude of the force is defined by the formula 2νω sin ϕ [1]. At the Equator, where the latitude (ϕ) is 0°, the sine value is zero, making the Coriolis force absent [3]. As latitude increases toward the Poles (ϕ = 90°), the force increases, reaching its maximum at the poles [4]. Physically, this effect is linked to the variation in Earth's tangential rotational velocity across different latitudes . The tangential velocity is highest at the Equator (approximately 1670 km/hr) and decreases toward the poles, where it is essentially zero [5]. Because an object moving poleward retains its higher initial eastward momentum from lower latitudes, it appears to deflect relative to the slower-moving surface at higher latitudes. Thus, the effect is related to decreasing rotational velocity with increasing latitudes .

Sources

  1. [1] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 23: Pressure Systems and Wind System > Causes of The Coriolis Effect > p. 309
  2. [2] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 26: Tropical Cyclones > Coriolis Force > p. 356
  3. [3] FUNDAMENTALS OF PHYSICAL GEOGRAPHY, Geography Class XI (NCERT 2025 ed.) > Chapter 9: Atmospheric Circulation and Weather Systems > Coriolis Force > p. 79
  4. [4] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 23: Pressure Systems and Wind System > UPSC Prelims 2011] Which one of the following weather conditions is indicated by a sudden fall in barometer reading? > p. 308
  5. [5] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 18: Latitudes and Longitudes > The Shape of The Earth and Latitudinal Heat Zones > p. 241
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SIMILAR QUESTIONS

NDA-I · 2025 · Q91 Relevance score: 3.69

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 :

CDS-II · 2014 · Q46 Relevance score: 3.02

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IAS · 2024 · Q14 Relevance score: 1.47

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-II · 2010 · Q67 Relevance score: 1.22

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 ?