Construction Planning and Management
A tractor whose weight is 20 tonnes has a drawbar pull of 2500 kg, when operated on a level road having a rolling resistance of 30 kg per tonne. If this tractor is operated on a level road having a rolling resistance of 40 kg per tonne, then the drawbar pull of the tractor will

Increase by 250 kg
Reduce by 250 kg
Reduce by 200 kg
Increase by 200 kg

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

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

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