Welcome to BrainDen.com - Brain Teasers Forum
|Welcome to BrainDen.com - Brain Teasers Forum. Like most online communities you must register to post in our community, but don't worry this is a simple free process. To be a part of BrainDen Forums you may create a new account or sign in if you already have an account.
As a member you could start new topics, reply to others, subscribe to topics/forums to get automatic updates, get your own profile and make new friends.
Of course, you can also enjoy our collection of amazing optical illusions and cool math games.
If you like our site, you may support us by simply clicking Google "+1" or Facebook "Like" buttons at the top.
If you have a website, we would appreciate a little link to BrainDen.
Thanks and enjoy the Den :-)
Posted 25 March 2008 - 12:03 AM
Posted 27 March 2008 - 01:58 PM
Turn on two switches - leave them on for 5 minutes
turn one off
One bulb will be on (the switch you left on)
One bulb will be hot (the switch you turned off)
One bulb will be off (the one you never touched)
Posted 29 March 2008 - 11:30 AM
Posted 03 April 2008 - 01:45 PM
Here...I'll try to reword the puzzle:
There are two rooms connected by a door. This door is closed and sealed of all light passing through it. There are no other ways into either of these rooms besides one door in the room with the light switches that is hermetically sealed, boarded, welded, and sealed by 87 billion billion quantum robots upon you entering the room to start the puzzle. You can not see outside of any room once it's door(s) are closed and sealed.
You are in one room that has three handicap and child accessible, two position (on or off), switches who's on/off positions are clearly labeled in contracting writing, raised lettering, and braille.
In the other room there are three light fixtures that each have a UL/ETL certified to be in proper operating condition incandescent light bulb installed in them.
These fixtures, and their bulbs, are placed in such a manner as to be reachable by every living thing on this earth.
The light fixtures are operated by the three light switches in the room you are currently in. Each light switch turns on only one of the light fixtures.
The light fixtures are situated such that the heat generated from one turned on incandescent light fixture's bulb will immeasurably effect any other fixture or bulb.
You are in the light switch room by yourself, and shall remain alone throughout the duration of this puzzle. No other person or thing, besides what has been provided said forth in this writing, shall assist you in this puzzle. Nothing can be moved in any way, shape, or form, EXCEPT the light switches (on or off), you (of course), and the door (open or closed).
The door can only be opened one time. When this door is opened you may enter the other room. Upon entering the other room you may NOT reenter the previous room for any reason. You must solve the puzzle upon entering the light fixture room. You have no time limit, and may remain there until any/all bulbs burn out if you so desire (good luck with that).
The puzzle begins upon you entering the room with the light switches in it, and the connecting door, to the room with the light fixtures in it, has been properly closed/sealed.
You may not use the restroom at any time during this puzzle.
You are naked and have nothing with you. You are not allowed to bring anything concealed in any orifice, or otherwise, with you..
There are 25 million instantaneous backup generators that each have 25 million instantaneous backup generators in case of power outage.
In case of any other emergency the puzzle is over and you should seek safety immediately.
No food or drinks allowed.
Edited by lords8n, 03 April 2008 - 01:46 PM.
Posted 05 April 2008 - 07:34 AM
Posted 10 April 2008 - 09:13 AM
This is quite simple
Bulbs - Back to the Logic Puzzles
This is one of my favorite logic puzzles (Edit: it is more a practical than a logic puzzle).
Imagine you are in a room with 3 switches. In an adjacent room there are 3 bulbs (Edit: let's say in lamps which are on a regular table) - all are off at the moment, each switch belongs to one bulb. It is impossible to see from one room to another. How can you find out which switch belongs to which bulb, if you may enter the room with the bulbs only once?
Edit: No help from anybody else is allowed.
Edit: Find out which switch belongs to which bulb - identify all 3 switches (so find out what bulbs are switches 1, 2 and 3 connected to)Spoiler for Solution
Switch on a bulb for a min. then switch off.
Now switch on another and enter the room.
you can see the bulb which is switched on and by touching the other two bulbs u can derive which bulb belongs to which switch.( the bulb switched on must be hot)
1 user(s) are reading this topic
0 members, 1 guests, 0 anonymous users