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19.

Free float is mainly used to

A.	identify the activities which can be delayed without affecting the total float of preceding activity	B.	identify the activities, which can be delayed without affecting the total float of succeeding activity
C.	establish priorities	D.	identify the activities which can be delayed without affecting the total float of either the preceding or succeeding activities

20.

Whenever an activity has zero total float, then

A.	free float of the activity must be zero but independent float need not be zero	B.	independent float must be zero but free float need not be zero
C.	free float and independent float both must be zero	D.	free float and independent float both need not be zero

21.

Total float for any activity is defined as the difference between

A.	its latest finish time and earliest start time for its successor activity	B.	its latest start time and earliest start time
C.	its latest start time and earliest finish time	D.	its earliest finish time and earliest start time for its successor activity

22.

In the network shown in Fig. independent float for the activity 3-5 will be (the number on the arrow shows the duration of activity)

A.	0	B.	1
C.	2	D.	none of the above

23.

In the network shown in Fig. , the critical path is

A.	1-2-3-4-5-6	B.	1-2-4-5-6
C.	1-2-3-5-6	D.	1-2-4-3-5-6

24.

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.

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