# find the switch ?

109 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 Apr 11, 2019

1. number the switches
2. switch one of them on, lets say number 1
3. wait for 5-10 mins, switch the number 1 off and switch the number 2 on and
4. go upstairs and check the temperature of the bulbs off- cold one is number 3, warm one is number 1, the one which is still on- is number 2

Similar Puzzles

On occasion of Diwali (a Hindu festival), the local ice cream seller is selling ice cream at an 80% discount. But, he got just two flavors, vanilla and cocoa-chipped. He is selling vanilla at Rs 1 and Choco-chip at Rs 2. However, he is giving just one ice cream to each person.
Shruti went to the shop and give the seller Rs.2 and without asking her the seller gives her Choco-chip ice cream. Next, Anmol comes and also gave the seller the same amount i.e. Rs 2. Now the seller asks Anmol which ice-cream does he wants.

Why such a different behavior towards Shruti and Anmol?

+1 vote

I rhyme with poodle,
Have colors everywhere,
You can't eat me,
Even if I am bare,
I look beautiful when I have colors putted,
Another name for brain...............

Who am I ?