Source of this information is from http://www.ntpro.nl/blog/archives/1517-The-VCAP4-DCA-Exam-Blueprint-Guide-is-available.html
Per this information: 40 live lab activities, short pre‐exam survey consisting of 9 questions. Lab activities consist of multiple tasks, where each task is scored. The total number of activities provided is based on the total number of tasks. Because of this, the actual number of lab activities may vary slightly between exams.