SNN buiders interview questions

in hr round some regular type questions like tell about yourself,where do you see yourself after 5 years etc, nothng hard.In the technicals,questions were std size of 8' concrete block? weight of 8',6' and 4' concrete block? density of cement sand and steel. how to calculate the bbs at hooks and bends? define bench mark. what is tbm? expand tmt. how many 8' concrete blocks in 1 cu m? difference between isolated and combined footing. the imaginary line which joins the point of equal elevation is _? Weight of 25 mm and 12 mm dia steel bars? what is the density of water?If a drum of 1 cu m contains water what will be the wt. and vol. of stored water? chain surveying involves:- linear measurements,angular measurements, both or none? what is concrete mix for M25 grade concrete?