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Interview Question

QA Analyst Interview Boston, MA

You have 3 light bulbs in the attic and 3 switches in the

  basement. All of the lights are currently off. Each switch in the basement is wired to one light in the attic. With only making 1 trip to the basement, and one trip to the attic, how can you correctly identify which switch goes to which light?
Answer

Interview Answer

1 Answer

1

Sit in the basement and turn two switches on. Leave them on for 1 minute, turn one off and go right up to the attic. One light will be on, one bulb will be warm and off, the other bulb will be cool and off.

Interview Candidate on Aug 10, 2010

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