[Chris P.]

Whether or not you'll believe me, I got 100%.

There were three questions I wasn't sure about:

1) One of the electrical ones - the series - parallel one
2) Another electrical one - the first close the switch and how many lights come on
3) The one about air entering the cylinder only because of semantics. I stuck with the engineer's answer which is atmospheric pressure pushing the air in, but the answer above it (being pulled in by suction due to the piston moving down) is arguable also correct because atmospheric pressure wouldn't be able to push air in unless the pressure inside the cylinder drops. This happens, of course, due to the piston moving down and creating a "vacuum" (in gage pressure). I visualize things a lot and in this case it all depends upon which side of atmospheric pressure (above or below) your mind views this scenario from. The other possibility of creating the pressure difference to push air in is to increase the pressure on the outside of the cylinder. This is not what happens in this case, so one can think of it as "sucking" if one pleases.

Can you tell I'm at lunch right now???

Back to work....