Estimating and Costing
The trap which is provided to disconnect the house drain from the street sewer is called

Interception manhole
All listed here
Master trap
Intercepting trap

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Estimating and Costing
While estimating a reinforced cement structure, the omitted cover of concrete is assumed

For reinforcing longitudinal bar in a beam 25 mm minimum or diameter of the largest bar which is more
In thin slabs, 12 mm minimum or diameter of the bar whichever is more
All of these
At the end of reinforcing bar, not less than 25 mm or twice the diameter of the bar

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Estimating and Costing
The assumption on which the trapezoidal formula for volumes is based, is

The end sections are parallel planes
The mid-area of a pyramid is half the average area of the ends
All listed here
The volume of the Prismoidal is over-estimated and hence a Prismoidal correction is applied

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