Well................ladies & gentlemen, i got it repaired today !
It was the steering rack(KANGI) that was causing noise. According to machenic, when the car pass through the water, the water damaged the rack by entering in it and cause rust.
Anyway, they put a new bearing in it and did some lathe machine work and filled lot of grease in it and now no more noise.
Charges: lathe machine work...............400 + laboure charges ..........300. Total= Rs. 700.
Thanks all for ur guidence.