hi, i want to know if arduino uno can pass its limits more than 9volts. can an arduino uno will bget overheated if i do that
If you are talking about the VIN barrel jack you can go to about 12v with no problems.
If you mean the the chips themselves then no way you should use a voltage greater than the 5v (or sometimes 3.3v) regulated supply.
It depends on how much current is drawn from the 5v regulated output. And this depends on what you have connected to the pins and connected to the 5V line. The regulator (the chip right next to the barrel connector) will get hot if you draw too much current. If that chip feels very hot when you touch it with your finger then try using a lower voltage power supply.