Yes, you can file RTI Application for Verification of Marksheet to Gulbarga University.
Gulbarga University was established in 1980 by an Act of Karnataka State and hence is a "Public Authority" as per Section 2 (h) of the RTI Act.
You can file the application for a Certified Copy of the Marksheet by addressing it to the designated "Public Information Officer (PIO)" by paying the prescribed fee. Also, you must provide a Copy of the Marksheet which you wish to verify.
To know more about the procedure to file RTI for Verification of Marksheet, please refer https://onlinerti.com/how-to-file-rti-online-for-marksheet
To know about the procedure to file RTI in the State of Karnataka, please refer https://onlinerti.com/how-to-file-rti-online-for-karnataka