31. Three light bulbs are hanging inside a room. There are three switches on the wall outside the room. Each switch is connected to a light bulb. Initially all the light bulbs and the switches are in off state. You can visit the room only once. Can you find the switche of every light bulb.
Answer :
Turn the first switch on and wait for 5 minutes. Turn the first switch off and the second one on. Now go inside the room. The light bulb which is currently glowing is the one connected to the second switch. Touch the remaining two light bulbs which are in off state. The one which is slightly hot (because it glowed for 5 minutes) is corresponding light bulb for the first switch. Now you can figure out the third.
Answer :
Turn the first switch on and wait for 5 minutes. Turn the first switch off and the second one on. Now go inside the room. The light bulb which is currently glowing is the one connected to the second switch. Touch the remaining two light bulbs which are in off state. The one which is slightly hot (because it glowed for 5 minutes) is corresponding light bulb for the first switch. Now you can figure out the third.
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