Estimating and Costing
If the formation level of a highway has a uniform gradient for a particular length, and the ground is also having a longitudinal slope, the earthwork may be calculated by

All of these
Mid-section formula
Trapezoidal formula
Prismoidal formula

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Estimating and Costing
Pick up the incorrect statement regarding a master trap from the following:

The mica flap valve which opens inwards only, is fitted at the top of the inlet pipe
It is provided in between the lower end of the house drain and the street sewer
The water seal is less than that of ordinary traps
It is provided a cleaning eye at the top of the trap

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