Using Question Groups in Quizmaker

Can someone please describe how/when to use question groups in Quizmaker?  I'm putting together an exercise that has the user read instructions from a "blank" slide, take an action on a piece of software outside of the course and then advance to the "quiz slide" to answer a question about their results using the outside program.  I'll repeat this activity for several different scenarios. 

Is it best to make each set of slides (instructions on a "blank" slde + a quiz question slide) into a separate 'Question Group"?  Is there an advantage to doing that vs. having one question group that is blank, question, blank, question...? If so, can you describe the pros/cons?

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