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
The water seal is less than that of ordinary traps
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 regarding the centre line method of estimating a building

The centre line length is reduced by half the layer of main wall joining the partition wall
The centre line is worked out separately for different sections of walls of a building
All of these
Product of the centre line of the walls and area of cross-section of any item, gives total quantity of the item

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