60 cm
70 cm
80 cm
75 cm to 80 cm

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

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
The mica flap valve which opens inwards only, is fitted at the top of the inlet pipe

## 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

Mid-section formula
Prismoidal formula
Trapezoidal formula
All of these

1.00 mÂ³
0.90 mÂ³
0.94 mÂ³
0.98 mÂ³

## Estimating and Costing The cross-sections for a highway is taken at

30 meters apart
All of these
Intermediate points having abrupt change in gradient
Right angle to the centre line

## Estimating and Costing The area of a sloping surface of a protective embankment of mean heightâ€˜dâ€™, side slopes S: 1 and length â€˜Lâ€™ is

d Ã— d Ã— s
L.D âˆš(1 + sÂ²)
âˆš[dÂ² Ã— (ds)Â²]
2 L.D âˆš(1 + sÂ²)