Sure. Can't say I'd advocate it tho.
As an aside I tried the sample test and here is the first question:
Question 1: Incorrect
True or False: In Virginia, if a landowner posts a "No Firearms" sign, you must respect his wishes and not carry a firearm on his property, open or concealed.
Correct Answer: True
Your response: False
I thought that there was no requirement to acknowledge a sign... only an actual request by the property owner for you to leave / disarm. IIRC part of the justification had to do with not knowing if the actual property owner posted the sign.