| 1. low pressure in the Punjab plain. |
| 2. high pressure in areas South of India |
| 3. equatorial low being filled up by descending air current. |
| 4. the Himalayas. |
A) 1 and 4
B) 1 and 2
C) 1 and 3
D) 2 and 4
Correct Answer: A
Solution :
South west monsoon are the main mechanism through which nearly all Indian land mass experience rainfall. It accounts for nearly 80% rainfall of whole India. Vast size of Indian continent helps in developing the thermal gradient necessary to attract the vapour laden air from sea. Very high and extensive mountain systems of the Himalayas in the north, extending in an east-west direction, thus posing a formidable physical barrier between tropical and polar air masses. These barriers induce the precipitation of water from moisture laden air. As the air climb up the Himalayas their moisture retention capacity decreases due to cooling effect and this results into high rainfall.
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