~! FunKruti.com !~ puzzle of the day

[Ahamed Imam]

There is a closed room with a
light in it. Outside, there are 3 light switches. You can flick any of the
switches any number of times. 

You can only open the door and go into the room
once. You know that the light is initially off. How can you determine which
light switch operates the light?
answer is below


























 

Leave switch 1 alone.
Flick switch 2 for 1 hour, then flick back. Flick switch 3. 

Now look. If the
light is on, then the switch is 3, if the light bulb is warm, then switch 2,
else switch 1.