what Govt. jobs are there after doing B pharm ?

You can try applying for various Public sector Banks PO exams. You can appear for UPSC. To be specific in Pharmaceutical field, you can try for various positions like Drug Inspector, Pharmacist, Pharmacy Manager, Research Assistant Fellow, Assistant Professor, Professional Consultant, etc. Other options also include Reader, Lecturer and if you look at Indian Army positions in Pharma, they have Sepoy Pharma.

There are various options for you. If you want to go to the civil services then you will have to give UPSC CSE. You can also opt for various Bank PO Exams like IDBI or SBI and various other banks. You can go for SSC exams.

Other options are:

Pharmacist in govt hospitals.

Drug inspector

Can work in FDA of various states