Pick up the correct statement regarding the centre line method of estimating a building?

Pick up the correct statement regarding the centre line method of estimating a building?

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

If the formation level of a highway has a uniform gradient for a particular length, and the ground is also having a longitudinal slope, the earthwork may be calculated by_______________?

If the formation level of a highway has a uniform gradient for a particular length, and the ground is also having a longitudinal slope, the earthwork may be calculated by_______________?

A. Mid-section formula
B. Trapezoidal formula
C. Prismoidal formula
D. All the above

In the mid-section formula__________________?

In the mid-section formula__________________?

A. The mean depth is the average of depths of two consecutive sections
B. The area of mid-sections is calculated by using mean depth
C. The volume of the earth work is calculated by multiplying the mid-section area by the distance between the two original sections
D. All of the above