There are 3 switches outside a windowless opaque room. They are connected to 3 light bulbs inside the room. How can you determine which switch is connected to which bulb if you are allowed to enter the room only once?
Please note:
You don't have to use any other person, friend, relative, etc. You are alone & you have to determine it on your own.
There is no way to peak in the room since the room is window less. And is not made of Glasses...
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Answer -
Switch one light on for sometime, and switchoff &
switchon another one. Go in to the room and see the warmth of the off bulb. The
warm one is connected to the first switch, the on bulb is connected to the
second. And naturally the third is without warmth
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