UPSC General Studies Solved Paper - General Studies-2015

  • question_answer
    Consider the following statements.
    1. The winds which blow between \[30{}^\circ N\] and \[60{}^\circ S\] latitudes throughout the year are known as westerlies.
    2. The moist air masses that cause winter rains in North- western region of India are part of westerlies.
    Which of the statements) given above is/am correct?

    A)  Only1              

    B)  Only 2

    C)  Both 1 and 2                

    D)  Neither1nor2

    Correct Answer: B

    Solution :

    Exp. [b] The Trade winds blow from the sub-tropical high towards the equatorial low (35°N to 0° and 35°S to 0°). They blow from a North-Easterly direction in the Northern hemisphere and from a South-Easterly direction in Southern hemisphere. The westerlies comprise the airflow from the sub-tropical highs to the temperate lows (from about \[35{}^\circ N\] to \[60{}^\circ N\]and \[35{}^\circ S\] to\[60{}^\circ S\]). In the Southern hemisphere where there is continuous open ocean from \[40{}^\circ S\]to\[60{}^\circ S\], the westerlies blow with severity and are known roaring forties, furious fifties and shrieking sixties. Western disturbance is the term used to describe an extra-tropical storm that brings sudden winter rain and snow to the North-Western parts of the Indian sub-continent. This is a non-monsoonal precipitation pattern driven by the westerlies. The moisture in these storms usually originates over the Mediterranean sea and the Atlantic ocean. Hence, option [b] is correct.

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