Cut out flashcards (I print them on heavier stock and laminate them so they last).
Affix magnet to the back of each card (you can buy this in a roll and just cut off appropriately sized pieces).
Randomly put all the cards on your blackboard.
Give students an answer, such as lápiz.
Call on a student who will supply the question that word answers by going to board and tapping the correct card. In this case, it would be ¿Qué?
Of course you can also put these on your Smartboard, but I find using the blackboard is a nice change of pace.