Hello Lakshmi,
Phd will be of worth if really passionate about it.There are enormous job opportunities after phd.After phd you can become professor in any university of your choice.After phd you can also work in companies R&D department.No doubt it has wide scope.How helpful it will be in your career depends on you.R&D work require lot of patience.So it depends on your personality also.PhD will definitely open many opportunities but your passion and hardwork will determine worthiness of phd.
Please refer this link
https://www.iisc.ac.in/admissions/research-programmes/
Eligibility criteria is defined in this.
Hope I helped you.All the best for future endeavour!!!

IISc Bangalore

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