A basement room has 3 electric bulbs installed, labeled A, B and C. Their switch points are in ground floor. Each switch corresponds to one lightbulb (ie, A might turn on 3, B = 2, and C =1).
You have to determine which switch is for lights which bulb. You are allowed to enter the basement only once.
Answer: Electric bulbs heat up on igniting. Turn any switch for 10 mins. Switch it off. Turn on another switch and go to the basement. The bulb that is glowing is for the switch that is on. The bulb that is hot is for the switch that was perviously turned on. The last switch is for the other bulb.
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