Multiple choice

The most plausible explanation of the location of the Thar desert in Western India is

  1. the obstruction caused by the Aravallis to the rain bearing wind that proceeds to the Ganga Valley

  2. the evaporation of moisture by heat

  3. the absence of mountains to the north of Rajasthan to cause orographic rainfall in it

  4. that the moisture carried by the south-west monsoon is driven away by the dry upper air current
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C Correct answer
Explanation

The Thar Desert exists primarily because Rajasthan lacks significant mountain ranges to its north. Without mountains, there's no orographic effect - monsoon winds don't rise and cool to cause rainfall. The Aravallis are too low and run parallel to monsoon winds, making them ineffective barriers. Without orographic lift, moisture continues inland, leaving Rajasthan arid.

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