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

The water seal is less than that of ordinary traps
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
It is provided a cleaning eye at the top of the trap

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Estimating and Costing
Pick up the correct statement in case of water supply.

All of these
Pipes are classified according to their sizes and quality
Cutting through walls and floors are included with the item
Pipes laid in trenches and pipes fixed to walls are measured separately

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