Only if you were off the green when your ball hit your opponents ball. If you were on the green and you hit their ball then in matchplay the penalty is loss of the hole.
If you are on the green, and you are putting, if the pin is in the hole and you strike it with the ball, you receive a two shot penalty in stroke play or loss of hole in matchplay. You must also play the ball as it lies, so if the ball is holed, it is counted as holed (don't forget the penalty) If the pin is set at the side of the green and you hit it, the penalty is still the same.
There is no penalty, but it is classed as 'rub of the green' and the ball must be played as it lies.
If you are on the green and you hit another ball which is on the green, you receive a two shot penalty and must play your ball where it lies. The other ball must be replaced, you should have asked the other player to move the ball. If however you are not on the green and hit another ball, there is no penalty, you again play yours as it lies and the other ball must be replaced.
You get a free drop, no penalty
If an opponents ball is struck by your ball on the green while putting fom on the green his ball is replaced as close as is possible to its original position and you are charged with a one stroke penalty. If your ball is off the green and you hit his ball their is no penalty but his ball is to be replaced as close to possible to its original position. If the ball is not replaced and then played that player will be then be required to replace it back to its original spot and charged 2 stroke penalty.
Well, it wouldn't be a hole in one then, I'm sure it has happened, but they would just have to take relief from the putting green.
Ugh I don't know much about golf but I don't think so because if the oppositions ball is on the green and you put off of the green then it's not possible to hit it. I don't think.
If you are off the green, nothing, and play the ball as it lies. If you are on the green it is a two shot penalty and you must play the ball as it lies. So if you are on the green, and putt with the pin in, and it goes in the ball is deemed holed, but there is a two shot penalty.
it is not a penalty if the person you hit is the ball carrier. but it is however a penalty if the hit a lineman or any other non ball carrier.
You place a coin behind your ball, if they played away and hit your ball they would receive a two shot penalty- they would then have to play their ball as it lies and you would have to replace your ball.
At any stage, if you are on the green, or even if you are off the green. However, be careful, if your opponents ball is in motion, and you remove the pin without their permission you receive a two shot penalty. Also if you are on the green and you hole a shot with the pin in, or hit the pin, you will receive a two shot penalty.