Interview Question

Interview(Student Candidate) Atlanta, GA

If there are 3 light switches and 3 bulbs in another and

  you can only go into the other room with light bulbs once, how can you tell which lightbulb corresponds to which switch.

Interview Answer

1 Answer


Initially switch ON the 1st switch and wait for some time. Later switch OFF the 1st switch, next switch ON the 2nd switch and go to the room. A lighting bulb is corresponds to 2nd switch. In the remaining two bulbs the one which is hot that bulb corresponds to the 1st switch as it lights for some time so it became hot. The one which is not lighting and not hot that bulb represents to the 3rd Switch.

Sowjanya J R N on Jun 7, 2012

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