Justifying whether a given matter is an artwork or not

I began to receive sms and FB messages after announcing to students that I am going to have the mid term quiz today. Some of them chasing me virtually for tips and scope of question for revision. However, I asked them not to worry and there is nothing for them to prepare. One of the student replied my sms and said, "lecturers never say exam difficult de lor..hahaha!" Some were asking for their learning journals as they intend to do revision. Again, I told them that revision isn't necessary.

In fact, I always say my paper (in exam) is very difficult. And this was proven in previous semester and students whom had taken this course scared their juniors about how scary I am. Yes, I am. You need to memorize what you have understood and then apply those knowledge flexibly to score in my paper. That is a level 1 to 4 requirements in cognitive domain of learning. Students can never depend on luck or common sense to score in the paper.

The quiz I gave was relatively easy. I prepared a one slide PowerPoint that contains 30 items. And then I prepare blank writing paper with number, and each student has to determine whether the item he or she received is an artwork or not, and then justify why it is or isn't artwork. Students cannot copy the answers of those sitting around them as he or she doesn't know whether they got the same item or not. Furthermore the question is rather open-ended.

So good luck!