"Elves are very good at board games, and I'm NOT an elf!"
Suppose Inspector Moss uses the Bomb to create an aperture that now opens upon an adjacent unrevealed tile. Since that tile now becomes visible to Inspector Moss, presumably it is to be flipped face-side up and placed.
Yes, the tile is revealed by the bomb and should then be flipped face-up and placed as normal.
Can this placement be such that one of its wall faces aligns with the aperture just created by the Bomb? And if so, does that seal the aperture?
Yes, a wall on the newly revealed tile can be placed against the aperture, but this does not seal up the aperture created by the bomb.
Hope this helps.