South Arcot and Ramanathapuram receive over 50 percent of their annual rainfall from which one of the following?
- A.South-west monsoon
- B.North-east monsoon
- C.Bay of Bengal branch of summer monsoon
- D.Western disturbances
Correct answer
Explanation
The correct answer is B, North-east monsoon. South Arcot and Ramanathapuram lie on the Tamil Nadu coast, which gets most of its yearly rain from the retreating, or north-east, monsoon in October to December. During the south-west monsoon of June to September, the Tamil Nadu coast lies in the rain shadow of the Western Ghats, so the moist winds from the Arabian Sea drop their rain on the western side and little reaches the east. When the monsoon retreats, the winds blow from the north-east across the Bay of Bengal, pick up moisture and bring heavy rain to the Coromandel coast. Cyclones forming over the Bay in this season add to the rainfall, which is why Chennai's wettest months are October and November. Option A is wrong because the south-west monsoon gives this coast only a small share of its rain. Option C is wrong because the Bay of Bengal branch of the summer monsoon mainly waters north-east India and the Ganga plains. Option D is wrong because western disturbances bring winter rain to north-west India, not Tamil Nadu. Exam tip: Tamil Nadu coast gets winter rain from the north-east monsoon, October to December.
Practice Questions
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