Thank you for your quick response.
Actually, the problems were listed on a piece of paper.  The instructor put the piece of paper on a projector to show to all students in class.  I was trying to describe the problems were typed under two columns and made each word even smaller.  I did not think the student was able to see any word. Do you think I can add anything besides on the wall?  "The instructor used a projector to display two-column, multiple-choice problems."