Q56 / 270 · NDA 2018 (Phase 2) · General Ability

Statement I : Geostrophic wind blows above a height of 600 metres, parallel to the isobars. Statement II : Geostrophic wind is the horizontal wind velocity, in which the Corialis force balances the horizontal pressure force.

  • Correct answer
    A
    Both the statements are individually true and Statement II is the correct explanation of Statement I
  • B
    Both the statements are individually true but Statement II is not the correct explanation of Statement I
  • C
    Statement I is the true but Statement II is false
  • D
    Statement I is false but Statement II is true

Solution

A geostrophic wind flows parallel to the isobars. In this model of wind flow in the Northern Hemisphere, wind begins as a flow of air perpendicular to the isobars under the primary influence of the pressure gradient force. As the movement begins, the Coriolis force (CF) begins to influence the moving air causing it to deflect to the right of its path. This deflection continues until the pressure gradient force and Coriolis force are opposite and in balance with each other.

Hence, the correct answer is option: 'A'.

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