Quantity Esimation Questions

1.how do u calculate the qty of tropozidal and cone foundations.
2.what will be the deduction area in plastering surface.
3.is the column quantity can be taken slab top to slab top or otherwise.
4..excavationnqty how to be taken.give a brief.
5.for a quantity of 1cum bankrolling what is the quantum of material needed.give a brief.
6.what is the meaning of 10/ 7 mixture with reason

like this there are plenty of question
IT is totally depend upon the project and up to the interviewer how is forming questions