Murphy's Law did not come to the forefront of my mind although have heard of it.
Murphy's Law seems to suggest that eventually everything that could have gone wrong will have at some point. While Sod's Law is more of a singular reference - on this particular occasion, so much can go wrong that something must.
But I don't think this is upheld in its common usage - ie. in the UK we just say its Sod's Law as a generalisation : Things can go wrong, things will go wrong.
BTW, Q1 is slightly incorrectly worded - should remove "that" or add "is an". Noticed it on the front page today...