Is h pylori (helicobacter pylori) contagious? is it possible for one person to transmit the bacteria that causes ulcers (helicobacter pylori) to another person?

Yes, : Yes, h pylori can be transmitted quite easily from one person to another, although in modern, sanitary conditions, that transmission is much less common than it used to be.

Yes: H Pylori can be transmitted from one person to another by saliva. It can also be transmitted by exposure to an infected persons feces such as occurs with contaminated water.