Estimating and Costing
While estimating the qualities for the construction of a building, the correct metric unit is

Square meters for volume
Meter for length
Liter for capacity
Cubic metre for area

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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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