Output of Hex of ino
I have a hex file of a sketch i.e. sketchname.ino.hex. Can I find out anything from that hex file ? 


That is a binary image of the compiled sketch in a hexadecimal notation. You could spend hours disassembling it if you understood the right tools to use.


  Can I see the output or anything ? 


You can convert it back to a crude form of assembly language maybe, but that is all. Understanding what that means takes skill and knowledge.


  Can I upload it on arduino ?


Sure. It's a compiled program ready to be uploaded to an Arduino.

avrdude -D -patmega328p -PCOM3 -b115200 -C/path/to/avrdude.conf -c arduino -Uflash:w:sketchname.ino.hex:i