Construction Planning and Management
If the excavation of earth is done manually then it costs Rs. 10 per cum. A machine can excavate at a fixed cost of Rs. 4000 plus a variable cost of Rs. 2 per cum. The quantity of earth for which the cost of excavation by machine will be equal to the cost of manual excavation is

500 cum
2000 cum
1000 cum
1500 cum

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Construction Planning and Management
Free float is mainly used to

Identify the activities which can be delayed without affecting the total float of either the preceding or succeeding activities
Establish priorities
Identify the activities which can be delayed without affecting the total float of preceding activity
Identify the activities, which can be delayed without affecting the total float of succeeding activity

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Construction Planning and Management
Whenever an activity has zero total float, then

Free float and independent float both need not be zero
Free float of the activity must be zero but independent float need not be zero
Free float and independent float both must be zero
Independent float must be zero but free float need not be zero

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