Access to node by link only

Hi Guys,

Here is my problem, I only want members to be able to use a certain node if they say yes to certain questions form another node:

Node-1: will ask 10 questions if the answer is yes to all they then click the Yes link and go to Node-2 ( where a webform is ) if they click No then its to a 'No Page'

I know the above is easy but my question is: say I only want users to be able to access Node 2 through the Node-1 route. I dont want users to be able to just put the node url in the address bar and get there that way.

Node-1 questions are my terms for Node-2 webform.

Thanks

Robert