Estimating and Costing
Pick up the correct statement regarding the centre line method of estimating a building

All of these
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
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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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 a cleaning eye at the top of the trap
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

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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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