Select the incorrect statement.
A. A critical path always begins at the very first event.
B. A critical path always terminates at the last event.
C. Critical activities control the project duration.
D. Critical activity is the one for which free float is zero.
Answer: Option D
Solution (By Examveda Team)
Critical activity is not necessarily the one for which free float is zero.Free float is defined as the amount of time an activity can be delayed without delaying the early start of its successor activity. It is calculated as:
Free Float = Early Start (Successor) - Early Finish (Current Activity)
Critical activity is the activity that lies on the critical path. For these activities, the total float is zero, meaning there is no room for any delay in these activities without impacting the overall project completion time.
Total float is defined as the amount of time an activity can be delayed without delaying the overall project. It is calculated as:
Total Float = Latest Start - Earliest Start or Latest Finish - Earliest Finish
Hence, while the free float of an activity may sometimes be zero, critical activities are identified based on total float, not free float.
Thus, the statement in Option D is incorrect.
This Question Belongs to Civil Engineering >> Construction Planning And Management
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