If you want to go for Government jobs then there are quite a number of them like SSC CGL, RRB NTPC, UPSC CSE, State Civil Service, State PSC  etc but this will not be anything related to your field of study i., Geology.

Now if you want to get a job on what you have studied then you should go for MSc Program. You can also for Geophysics at BHU which will give you an ample scope to progress in your field. If you clear GATE with good results in Geology & Geophysics paper then you will also get to work as an Geologist in Government PSU which will justify the investment of your time.

I hope this answer helps. All the very best for your future endeavors!