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

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
The centre line length is reduced by half the layer of main wall joining the partition wall
All of these

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

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

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Estimating and Costing
In the mid-section formula

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

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