Q1:

Which are the critical activities of the bar chart shown above ?

ANS:A - Activities B and E

Critical activies are the activities which if delayed, then whole project gets delayed. Here, we are assuming that some events can only start after previous one are finished.

Thus, if A gets delayed then C will be delayed and following which E will be delayed leading to project delay. Similar, can be said for C and E.

Thus, A, C and E are critical activitie.