Construction Planning and Management
A father notes that when his teenage daughter uses the telephone, she takes not less than 6 minutes for a call and som? times as much as an hour. Fifteen minutes call are more frequent than calls of any other duration. If these phone calls were an activity in PERT project, then phone calls expected duration will be

21 minutes
27 minutes
15 minutes
20.143 minutes

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

Free float of the activity must be zero but independent float need not be zero
Free float and independent float both 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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Construction Planning and Management
If the optimistic time, most likely time and pessimistic time for activity A are 4, 6 and 8 respectively and for activity B are 5, 5.5 and 9 respectively, then

None of these
expected time of activity A is greater than the expected time of activity B
expected time of activity B is greater than the expected time of activity A
expected time of both activities A and B are same

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Construction Planning and Management
During the construction period, price variation clause in contracts caters to

Variation in total cost of the project on an ad hoc basis
Variation in cost in materials element, labour element and petrol-oil-lubricant element
Rate of inflation
Increase in rates of only important materials

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