You have 3 switches and 3 bulbs to it
now the 3 bulbs are not visible outside the room
switches are outside the room
you are allowed to enter only once in a room
how will you check that which switch belongs to which bulb
Subscribe to:
Post Comments (Atom)
nobody who was in discussion with me to this question previously will answer at last
ReplyDeletetake a red, blue & green colored transparent plastic cover with you when u enter the room..
ReplyDeletecover 1st blub with red... 2nd with blue.. 3rd with green...
exit room...
use 3 switches to see the color of light in room when a particular switch is pressed..
P.S. bulbs are not visible from the place outside room. Here we just need to see the color of light..so no need to see the bulbs.. seeing ne part of room wud do...
@Khushraj: may b a lame answer...wrote what came to me at first thought...:P
we are not allowed to do that as the room is closed and you can only open when you want to enter
ReplyDeleteall the connections are in parallel in a household network,,,by openin wirin around switched add diff resistances wid each bulb in series n hence change in intensity of each bulb n by means of load attached we know respective switches.......
ReplyDeletea nice answer but we are not provided with any tools to open the switch and to add resistance we must be equipped
ReplyDeletebut still an innovative answer
Press switch 1 and turn it off after sometime, then switch on no.2 and enter the room....
ReplyDeleteThe bulb which is glowing is for switch no.2 ...
Now, touch the remaining two bulbs.. out of them, the one which is hot is for switch no.1 and the one which is at room temp. is for switch no.3
a very nice answer by samir where you dont need tools and anything
ReplyDeleteJust need to use oen more property of bulb that is light and then and you can actually categorize into four cases no heat no light,no heat,light light heat,heat no light
So an awesome answer and explanation preceding