For excavating utility trenches with precise control of depth, the excavation equipment used is_______________?

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

A. Ice
B. Concrete
C. Loose sand
D. Earth

A. 3425 kg
B. 5515 kg
C. 4350 kg
D. 2975 kg

A. is always longest
B. is always shortest
C. may be longest
D. may be shortest

A. increase in rates of only important materials
B. variation in cost in materials element, labour element and petrol-oil-lubricant element
C. variation in total cost of the project on an ad hoc basis
D. rate of inflation

A. an activity
B. an event
C. both event and activity
D. none of the above