UPSC Prelims 2005·GS1·geography·climatology

Assertion (A): Wind patterns are clockwise in the northern hemisphere and anticlockwise in the southern hemisphere. Reason (R): The directions of wind patterns in the northern and the southern hemisphere are governed by the Coriolis effect.

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  1. ABoth (A) and (R) are individually true and R is the correct explanation of A
  2. BBoth (A) and (R) are individually true and R is not the correct explanation of A
  3. CA is true but R is false
  4. DA is false but R is true 36 AssertionCorrect

Explanation

The Assertion is false because it is a broad generalization that does not specify the type of wind system. In the Northern Hemisphere, winds move clockwise around high pressure areas anticyclones but anticlockwise around low pressure areas cyclones. The pattern is exactly reversed in the Southern Hemisphere. Therefore, stating that wind patterns are clockwise in the Northern Hemisphere as a universal rule is incorrect. The Reason is true because the Coriolis effect, caused by the Earths rotation, is indeed the primary force that deflects moving air to the right in the Northern Hemisphere and to the left in the Southern Hemisphere, thereby governing the direction of wind patterns. Since the Assertion is false and the Reason is true, the correct option is D.
geography: Assertion (A): Wind patterns are clockwise in the northern hemisphere and anticlockwise in the southern hemisphere. Reas

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