Q1: If the depth of two column sections are equal, then the column splice is provided

ANS:D - none of these.

Splice in web designed for BM and SF.

Splice in flange designed for axial forces only (i.e. Tension and Compression only).

No need for any filler and bearing plates, the Only splice is needed if the depth is the same.

If upper column depth is less than the bottom column, in that case, filler, bearing and splice all three needed.