Latest self Aptitude Question SOLUTION: 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 t

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(#M40002945) SELF question Keep an EYE

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?

Solution

First on a switch for 5 min, then make it switch off and switch on the other, go to the room, if bulb is on then 2nd switch is answer, if bulb is off then touch the bulb if it is hot then 1st switch is answer, otherwise 3rd switch is answer.

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jai Narayan Mishra (12 years ago)

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