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

Master trap
Interception manhole
Intercepting trap
All listed here

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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 mica flap valve which opens inwards only, is fitted at the top of the inlet pipe
It is provided a cleaning eye at the top of the trap
The water seal is less than that of ordinary traps

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Estimating and Costing
In the mid-section formula

The mean depth is the average of depths of two consecutive sections
The volume of the earth work is calculated by multiplying the mid-section area by the distance between the two original sections
All of these
The area of mid-sections is calculated by using mean depth

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