As you want to get the details that is there any need to send hardcopy of Gate form, if I applied through online registration so here is the information of the same for you:

Yes you have to send the print-out of generated application form (after online registration), by registered/ speed post to the Chairman of respective zonal GATE office.

This application form must be reached to the GATE office on or before the last date expires.

GATE Zones:
Zone 1 - Indian Institute of Science Bangalore
Zone 2 - Indian Institute of Technology Bombay
Zone 3 - Indian Institute of Technology Delhi
Zone 4 – Indian Institute of Technology Guwahati
Zone 5 - Indian Institute of Technology Kanpur
Zone 6 - Indian Institute of Technology Kharagpur
Zone 7 - Indian Institute of Technology Madras
Zone 8 - Indian Institute of Technology Roorkee