After B.S. from IISc, should I continue my M.S> and PhD in IISc or go abroad? What government jobs in India can I get after PhD?

Majority Jobs After Ph.D will be found in the following sectors
Medical
Teaching
Banking
Railways

The PhD degree will be having good weightage depending upon the research area you have selected and level of papers published irrespective of country. Please search on the area which is more demanding in the next five to ten years to come and start working on it which will give you the best.

Please feel free to post any query you have

Thanks....