Nice idea. However, it is less a survey on what is misleading or not, but a quiz who finds out what it stands for. I doubt, that the results will give us much insights on whether the icons are easy to understand or not.
First of all, it is totally different if someone who uses Limesurvey on a regular/daily basis answers or someone who hasn't used Limesurvey yet. So it would be good to have some basic information on the experience with Limesurvey.
Second, some icons might not be clear to newbies, but when given the choice between, for example, deleting, adding and copying conditions, it should be quite easy to answer what is what. I am experienced in LS, but I guess if you would have asked me without mentioning, that it is about conditions, I might have had a hard time.
Same with quota vs. statics icon. Both icons shown side by side I can get it right, but without that help, I don't know whether I would get it right.
At the moment it is a little bit like a quiz and guessing can bring you quite far.