Question

Chennai has more rainy months but less rainfall than kochi

Answer 1

This is so because Chennai is near the coast therefore it's weather is rainy and there is more rainy months incomparision to Kochi.
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Answer 2

Rainstorm season in Kochi is for the most part from June to September brought by the South Western breezes began from the Arabian ocean. As Kochi lies at the windward side of the S-W rainstorm winds, it encounters substantial precipitation amid this season. Kochi likewise experience lighter precipitation from October to December from the North Eastern storm twists as it lies at the leeward side of the North Eastern rainstorm winds.  

Chennai lies at the Windward side of north eastern storm thus the region get most downpour from the N-E rainstorm which have relatively lesser water content, from October to December. Chennai likewise get downpour from the S-W rainstorm (April - October) which is lighter due to being situated at the leeward side of S-W storm winds.