Interesting Questions

I encounter some interesting questions on the Web, which seemed to common in Google and Microsoft interviews. Try to see you can answer these. I will publish my answers later.

1. You go one mile North, One mile East, One mile South and you come to the same point you started. How many points like this are on earth and how do you form these.
(Hint : I got to know from a different resource that, if your answer is
1, 2 - you will not be hired, infinity - you will be hired, infinity * infinity - the correct answer !!)

2. There is a room at the corner of a hallway. It has a light in it and the door is closed. You have three switches (which of course has only on and off positions only) at the other end of the hall. You are allowed to go in to the room only once. How do you find the correct switch associated with the bulb in that room?

3. This is a famous question and considered as a fermi problem.
How much you will charge to wash all the windows in your city?

4. How do you weigh a boeing 747?

5. There are 5 pirates on an island. They have 100 gold coins. These pirates have seniority rankings. Number one is senior than all the others, Number two is the second and so on. The most senior person can propose a plan on how to distribute the coins. If it is accepted with 50% or more votes (including his vote) he can execute that plan. Else, if he lost it, he will be killed and the next senior pirate gets the chance to propose and so on. You can assume that all the pirates are thinking logically and all wants to live. If you are the most senior person what is your plan which will get you lots of coins and will not be killed by others?

6. How many times a day, the clocks hour and minute hands overlap?

None of these questions are stupid or has stupid answers. All these are logical. I will post my answers to these after some time.

There are lot more questions like this, and I really like those brain teasers.

More questions : 1, 2, 3
Interesting book on these : How would you move mount fuji?