Interview Question

Interview(Student Candidate) Milpitas, CA

Last interviewer had an event in which he had three light

  switches that each controlled three different light bulbs and my job was to find which switch went to which light bulb. The environment was that I was in a room in which I could not see the light bulbs unless I left the room but if I left the room I could not go back into it.

Interview Answer

1 Answer


Turn one switch on and keep it on for a bit letting the light bulb warm up. Turn on another switch about 5 minutes later and turn off the first switch. Upon entering the room, the warmest light bulb that is off belongs to switch 1, the coolest belongs to switch 3, and the light bulb still on belongs to switch 2.

Interview Candidate on Apr 17, 2012

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