How can we identify,which one is iron ball and magnetic ball in two same colour,wieght and same size?
Conditions-
1-don't touch both of them with any external things,forces etc...

If both are iron, the magnetic one will have an effect on the other one, right? So how do you envision a way to see which one is which, using your hands?

Well, there is a very useful simple tool which you can use, and which doesn't require you to touch either balls. Its name begins with a c.

Oops right wish I could remove my answer Unknown

I wonder if using that particular tool violates the rules? Probably not, since you're not actually touching either ball, just using a non-contact tool.

Given that the OP clearly doesn't speak English as their primary language, it may be a little unfair to give a hint about the letter its name starts with. Then again, if the OP speaks Hindi, I think the word sounds very similar in both languages.

If that isn't the way to find this out, I'd be all around carrying a coil and a voltmeter :p

Or take another magnet.

I was thinking the same thing. :)

If you're not allowed to use ANYTHING other than observation, you could place both balls on a horizontal, flat, very hard, low friction surface like a piece of glass. The non-magnetic ball should remain stationary, while the magnetized ball should roll and/or spin until its magnetic axis lines up with the earth's.