@Mental_Ques (IAS, PCS, NDA )

Problem: Let's assume you are in a room which has 3 bulb and only 1 gate. There are 3 electric switches outside the room and the gate of room is closed. You have to tell us a method by which, how one can find which switch belongs which bulb?
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Condition: You can open the gate of room only once a time and before opening gate you can press switches (on / off) as you desire, but you must have to on only 1 switches before opening gate.

Solution: Firstly, On any one switch for 5 minutes. Then off it.

Secondly, on other switch and open the door and enter to room.

Touch the all three bulbs, you observe 

One is hot: it's that which belongs to that switches which you  start for 5 minute

One is currently glowing: it's that which belongs to that switches which you start before just enter to room

And remaining will be cold, which belongs to that switches which you remain unyouch

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