"When you program by yourself do you use source control?"

What I want to hear is that they use source control.  Source control -- even by yourself -- is an important tool that helps you backtrack out of coding tangents that fail.  Hosted on another server it is a valuable form of backup off your own box.  It also shows that the person has programmed in a shop where source control was enforced (rightfully so) and understand how it beneficial it is.