3 bulbs and 3 switches puzzle

Posted Date: 30 Nov 2011 Posted By:: Vijay Karthick B

Member Level: Silver Member Rank: 118 Points: 3 Responses: 4

Here we come up with another logical reasoning puzzle which was a very famous interview question a few years back.

There are three bulbs in a room and they are wired to three switches. The switches are outside the room. The room is locked. You have 30 seconds to determine which switch corresponds to which bulb. After 30 seconds, you can enter the room.

Simple na?

Responses

#5560 Author:

T Syed Rizwan Member Level: Gold Member Rank: 56 Date: 02/Dec/2011 Rating: 2 out of 5

Points: 2

Yes vijay, its simple. Just turn on the switch 1 and 2. Now turn off switch 2 and immediately go into the room. The bulb which is glowing corresponds to switch 1. The bulb which is diminishing its brightness corresponds to switch 2. And the third one which is not at all glowing corresponds to switch 3. Thats all.

Regards,
Rizwan.
Practice makes perfect..

#5571 Author:

Vijay Karthick B Member Level: Silver Member Rank: 118 Date: 05/Dec/2011 Rating: 2 out of 5

Points: 1

Hi Rizwan,

You are right. But the second bulb will diminish very quickly before you enter(Assuming room is locked, and you have to open the lock). Thus, I suggest, to touch the remaining two bulbs. The one which is hot corresponds to the second bulb. The one which is cold corresponds to the unpressed switch.

#5578 Author:

T Syed Rizwan Member Level: Gold Member Rank: 56 Date: 06/Dec/2011 Rating: 2 out of 5

Points: 0

Hi vijay,
Thanks for your clarification.

Regards,
Rizwan.
Practice makes perfect..

#5579 Author:

Vijay Karthick B Member Level: Silver Member Rank: 118 Date: 06/Dec/2011 Rating: 2 out of 5

Points: 1

Hi Rizwan,

Try to solve the other riddles and puzzles I posted in miscellaneous category of general forum.

Post Reply

This thread is locked for new responses. Please post your comments and questions as a separate thread.
If required, refer to the URL of this page in your new post.

	Next : Solve this if you can! - The best puzzle I came accross :)
	Previous : Chief Minister announced Pongal bonus!
	Return to Discussion Forum
	Post New Message
	Category: Miscellaneous

Related Messages