# Puzzle Archives :: Interview Puzzles

**Home**>

**Puzzle Archives**>

**Interview Puzzles**>

**Puzzle List**

**Add New Interview Puzzles**

* Practice Sets *

* Puzzles Archives Co. *

* Co. Cloud *

- Question :: 1
# Three Bulbs & Light Switches

You’re in a room with three light switches, each of which controls one of three light bulbs in the next room. You need to determine which switch controls which bulb. All lights are off to begin, and you can’t see into one room from the other. You can inspect the other room only once. How can you find out which switches are connected to which bulbs?

- Question :: 2
There are three boxes, one contains only apples, one contains only oranges, and one contains both apples and oranges. The boxes have been incorrectly labeled such that no label identifies the actual contents of its box. Opening just one box, and without looking in the box, you take out one piece of fruit. By looking at the fruit, how can you immediately label all of the boxes correctly?

- Question :: 3
You have a 100 coins laying flat on a table, each with a head side and a tail side. 10 of them are heads up, 90 are tails up. You can't feel, see or in any other way find out which side is up. Split the coins into two piles such that there are the same number of heads in each pile.

No Best Answer on this question yet!

**Asked In :**Wipro Alcatel-Lucent - Question :: 4
There are two people, they were born on the same second, same time, same day, same week, same month, same year and from the same mother. But they are not twins. How is that possible?

No Best Answer on this question yet!

Not Yet Asked in Any of the Companies

- Question :: 5
There are 10 stacks of 10 coins each. Each coin weights 10 gms. However, one stack of coins is defective and each coin in that stack weights only 9 gms. What is the minimum number of weights you need to take to find which stack is defective? How?

No Best Answer on this question yet!

**Asked In :**Tech Mahindra

Puzzle test enable the companies to check the Logical skills of a candidate. Check out these Puzzle topics with answers for the interview! You can choose a topic and speak up your mind through a Gmail type editor.