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Light Bulb Riddle
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There is a two-story house with a room at the 2nd story. There is a light bulb in reaching distance on the ceiling. There are no windows or cracks or visible means of seeing the light bulb from the outside. There is one door in front of the house. There is a panel of three light switches beside the door. The panel is impregnable. The door may only be entered once. The light switches are all wired to nothing, but one which is wired to the light bulb. How can you find out what light switch it is?
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Turn on all three switches - the lightbulb will come on!
Source: Common Sense
Answer Date: 08:49pm 04/14/08
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Check the electric meter to see if the disc is turning if it is not Open door enough to reach in to turn on the first switch check disc again if not turning turn first switch off and turn on second switch check disc again if still not turning then reach into open door turn off second switch and turn on third switch and check disc again it should be turning very slowly enter house to check light that is now burning.
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Answer Date: 09:59pm 04/14/08
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Leave one switch off,
Turn one switch on for a few minutes then turn it off,
Turn the last switch on and enter the room.
Feel the light-
If the bulb is off and cold then its the first switch (or none go to the light)
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Turn one switch on for a few minutes then turn it off,
Turn the last switch on and enter the room.
Feel the light-
If the bulb is off and cold then its the first switch (or none go to the light)
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Answer Date: 03:22am 04/16/08
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you cant - the light panel is impregnable so you cant get to the switches!
Answer Date: 04:11am 04/16/08
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