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can you get someone else to go to the attic and shout down?

Mentally number the switches 1, 2 and 3.
Throw switches 1 and 2.
Wait for a while, then return switch 1 to its initial position and leave switch 2 on.
Go up to the attic.
The bulb that is lit corresponds to switch 2. The bulb that is not lit but is hot to the touch (i.e. has only been lit recently) corresponds to switch 1. The remaining bulb (unlit, cold) corresponds to switch 3.

Three married men and their three wives want to cross a river, but the only means of doing so is in a boat capable of holding only two people. None of the husband wants his wife to remain without him in the company of other men. How can they get across?

Swim.

Key: mx where x=1, 2, 3 are the 3 men
wx where x= 1, 2, 3 are the 3 wives

m1 and w1 cross
m1 goes back
m2 and w2 cross
m2 goes back
m3 and w3 cross
m3 goes back
m1 and m2 cross
w3 goes back
m3 and w3 cross

It's a see-saw

Everyone knows that the four cardinal points and the time of day can be defined by looking at the sun. Can the same be done by looking at the full moon?

Just like the sun, the moon is highest over the horizon when it’s in the south. At this point it gives off enough light to be able to discern shadows of objects (say, on a sundial). But the difference is that the shadows in the moonlight are shortest at midnight. The shadow’s direction will point to the north. Knowing where the north is, we will be able to establish the other cardinal points as well.

Of course you can! Just Light both ends of one rope, and one end of the other. After 30 minutes have passed, the first rope will be entirely burned and thirty minutes will be gone form the second. Now light the unlit end of the second rope, 45 minute timer!

You would see yourself in a room made of mirrors.

If the light source is invisible, then it would be pitch black.