I don't think you necessarily have to ask a stock test question here either. Maybe for a banquet/convention facility it makes sense, if you don't have any particularly tricky requests at the time of booking.

For a software project, your project is probably the tricky thing already. The Orange Juice test there is I just told you want I need, did you put any thought into how you might solve it, what the steps would be, how that would translate into cost, and can you communicate that to the client. Or, did you just throw out a basic number, with no details and no real thought behind it. Asking clarifying questions, or showing an example of something close to the solution is a good sign too.