Construction Planning and Management
A four wheel truck or whose operating weight is 12000 kg is pulled along a road having a rising slope of 2% at a uniform speed. Assume grade resistance factor = 10 kg/tonne. The tension in the tow cable is 720 kg. The rolling resistance of the road will be

40 kg/tonne
50 kg/tonne
30 kg/tonne
20 kg/tonne

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

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

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