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Scientific Method
The lightbulb starts OFF. You flip Switch A to ON and wait for 10 minutes. Then you turn Switch A back to OFF and flip Switch B to ON. You immediately open the door and walk inside. The lightbulb is currently OFF, but when you touch it, it feels VERY HOT.
Experiment #42
Based on the fact that the bulb is OFF but HOT, which switch is connected to it?
Action
Click the switch you believe is connected to the bulb.
How To
Use the clues from the scenario (temperature, state) to determine the logical outcome. Mark the only switch that fits all conditions.
Share The Fun
Invite friends to take this challenge!
Did You Know?
Incandescent bulbs convert about 95% of their energy into heat, not light.
This riddle is often used in technical interviews for big tech companies.
Logic puzzles like this test your ability to think beyond just visual state.
Modern LED bulbs generate much less heat, making this riddle harder in the future!
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