3 Switches and Light bulb Puzzle
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There are 3 standard on/off switches outside a room. One (and only one) controls a light bulb inside the room . The other two switches do nothing. You can only enter the room once, and cannot touch/change any switches after the door is open (or re-closed, for that matter). Damaging or disassembling the door, walls, or switches is against the rules.You can not see anything inside the room from outside in any way.Within these constraints, can you determine with certainty which switch controls the light bulb?
Switch on button 1 then after some time switch it off.And Switch on switch 2.Enter the room , observe the bulb .If it’s on and giving light it means switch 2 is the switch controlling it , if it is off touch it if it’s hot it means when we pressed switch 1 it turned on for that period that’s why it is hot.If it’s cold and off it means switch 3 is the switch controlling it.
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