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3 switches 1 light puzzle

+4 votes
325 views
asked in Manual Testing Interview Question by duke Expert (5,813 points)

 

There are 3 switches  and one bulb , the bulb is in the closed room and switches are out side of the room now you have to identify the correct switch of the bulb. you have only once chance to go inside the room.

 

1 Answer

0 votes
answered by amit_pammu Expert (5,030 points)
edited by amit_pammu
step 1 : Put On the first switch and wait for 2min , then off the switch

step 2 : Put On the second one and go to the room .

conclusion : if the correct switch was the first one , the bulb got heated , if its second one , it means bulb is lighting in the room , else it would be the third one,

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