How can you determine with which of the three switches the light bulb can be switched on? A light bulb is hanging in a room. Outside of the room, there are three switches, of which only one is connected to the lamp. In the starting situation, all switches are 'off' and the bulb is not lit.If it is allowed to check in the room only once to see if the bulb is lit or not (this is not visible from the outside), how can you determine with which of the three switches the light bulb can be switched on?

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2015-11-11T08:19:32+05:30

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First of all we have to switch on the first switch and have to leave it for 6 or more minutes. After that, we have switch off it and second switch have to be turn on. Now immediately go to the room and touch the bulb. If the bulb is hot, first switch is the answer. If the bulb is already glowing, second one is the answer. if bulb is neither glowing nor hot, third one is the answer.
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