top button
Flag Notify
    Connect to us
      Facebook Login
      Site Registration Why to Join

    Get Free Puzzle Updates

Facebook Login
Site Registration

which switch corresponds to which light bulb?

+1 vote
511 views

There are three switches downstairs. Each corresponds to one of the three light bulbs in the attic. You can turn the switches on and off and leave them in any position.
How would you identify which switch corresponds to which light bulb, if you are only allowed one trip upstairs?

posted Sep 2, 2014 by anonymous

Share this puzzle
Facebook Share Button Twitter Share Button Google+ Share Button LinkedIn Share Button Multiple Social Share Button

2 Answers

+3 votes

First we have to turn ON first switch and have to wait for 5 minutes, then we have to turn OFF it and turn ON the second switch and we have to check by going upstairs, the bulb which turned ON will corresponds to the second switch and we have to touch the remaining 2 bulbs, the one which is hot will corresponds to the first switch, the one which is neither hot nor ON will corresponds to the third switch.

answer Sep 2, 2014 by anonymous
+1 vote

Turn ON first switch and then wait for some moments.And Switch Off it, Then Switch On Second One.Go Up Stairs. Check the bulb which is glowing , that is Second Switch Control. Then Test remaining two with hand, Which feels your hand heat , that one is first switch control.

answer Sep 4, 2014 by Muniprasad



Similar Puzzles
0 votes

You are standing outside a closed door. On the other side of the door is a room that has three light bulbs in it. The room is completely sealed off from the outside. It has no windows and nothing can get in or out except through the door. On the outside of the room there are three light switches that control each of the respective light bulbs on the other side of the door.
3 Switch

Your assignment is to determine which light switch controls which light bulb. You are allowed to enter the room only once, and once you come out, you must be able to state with 100% certainty which light switch controls which light bulb.

0 votes

There are 3 switches downstairs, each corresponding to one of the light bulbs upstairs.
How can you figure out which light switch goes to which light bulb by only making 1 trip upstairs?

+5 votes

A light bulb is hanging in a room. Outside of the room, there are three switches, of which only one is connected to the lamp. In the starting situation, all switches are 'off' and the bulb is not lit.If it is allowed to check in the room only once to see if the bulb is lit or not (this is not visible from the outside), how can you determine with which of the three switches the light bulb can be switched on?

0 votes

You are standing in front of a room with one light bulb inside of it.
You can not see if it is on or off.
Outside the room there are three switches in the off positions.
You may turn the switches any way you want to.
You stop turning the switches, enter the room and know which switch controls the light bulb. how?

Contact Us
+91 9880187415
sales@queryhome.net
support@queryhome.net
#280, 3rd floor, 5th Main
6th Sector, HSR Layout
Bangalore-560102
Karnataka INDIA.
QUERY HOME
...