There are 3 switches in one room that control 3 electrical lamps located in the other room.You are allowed to spend 5 minutes in the room with switches,change their position as you want.Then you should go to the room with lamps and tell exactly what switch controls every lamp.You can’t return to the room with switches
This one was asked in an interview for a junior electrical engineer at intel.
Ans- you have 3 stwitches. put one switch on. wait for 1 min. switch it off. put another switch on and go into the room with the lamps. The on lamp is ofcourse controlled by the switch you turned on last. the warm but off lamp is the switch you put on first and turned off. the off and cold lamp is controlled by the switch you never touched.
Subscribe to:
Post Comments (Atom)
No comments:
Post a Comment