Which among the following is the correct method for designing the combined footing for two column loads ?

Centre of gravity of column loads coincides with the centre of gravity of soilreaction.

Centre of gravity of soil reaction comes exactly at the middle of column loads.

Centre of gravity of column loads coincides with a point at half the length of the footing.

Centre of gravity of column loads coincides with the point of intersection of the diagonals of the plan of footing.

What is a fine aggregate ?

Aggregate passing through 4.75 mm IS sieve and retained on 0.15 mm IS sieve

Aggregate passing through 80 mm IS sieve and retained on 4.75 mm IS sieve

Aggregate passing through 75 micron IS sieve and retained on 0.155 mm IS sieve

Aggregate passing through 80 mm IS sieve and retained on 75 micron IS sieve

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