Good Puzzle

One pair of diagonally opposite boxes of a chess board is removed. Assuming the size of a box as 1*1 (width * height),with how many paper pieces of size (2*1), you can cover the entire board ? No overlapping of paper pieces are permitted.


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Simple puzzle

The doors of a working refrigerator in a closed room, is accidently kept open one day. 

a) Will there be any change in room temperature after some time? Why? 

b) Will there be any change in room temperature, if the refrigerator was an ideal one?

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Scientific puzzle

50 lorries with some load are connected back to back using non-extendable ropes. Suppose only first lorry is having an engine and that, it is capable of producing infinite torque (rotational energy).

a) Can this lorry convoy start moving with the help of first lorry only?
b)If your answer to the above question is NO, how a train engine pulls 50 bogies through less friction tracks?

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Good probability puzzle

If a stick is broken into 3 pieces, what is the probability that these pieces can form the sides of a triangle?
How?
(NOTE: In a triangle, the sum of any two sides will be greater than the third side)

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Simple Puzzle

For a multiple choice question, there are 3 possible solutions namely A, B and C. The choices given for the question was
A) Answer A
B) Answer A or B
C) Answer B or C
There is only one correct choice to this question. 
Which is that choice? 


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Average logical puzzle

Four angels sat on the Christmas tree amidst other ornaments. Two had blue halos (imaginary ring above head of angels) and two – yellow. However, none of them could see above his head. Angel A sat on the top branch and could see the angels B and C, who sat below him. Angel B, could see angel C who sat on the lower branch. And angel D stood at the base of the tree obscured from view by a thicket of branches, so no one could see him and he could not see anyone either.
Which one of them could be the first to guess the color of his halo and speak it out loud for all other angels to hear?


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Interesting puzzle

This photograph is taken by one of my colleague.  How this was taken using a still camera?

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Good Logical Puzzle

The Grand Master takes a set of 8 stamps, 4 red and 4 green, known to the logicians namely A, B, and C and loosely affixes two to the forehead of each logician so that each logician can see all the other stamps except those 2 in the Grand Master's pocket and the two on his own forehead. He asks them in turn if they know the colors of their own stamps:
A: "No."
B: "No."
C: "No."
A: "No."
B: "Yes."
What color stamps does B have? How? 


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Good puzzle

A long stick is cut into 3 pieces. What is the probability that these pieces form the sides of a triangle?
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Average logical puzzle

You want to send a gift to your friend securely in your box. The box can be fitted wth multiple locks and keys which you possess. But your friend doesn't have any keys for your locks. If you send the key in a open box, it might get copied in the route. How can you send the gift securely?

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Good Logical Puzzle

Xavier has one of the numbers 1, 2, or 3 in mind. Peter is allowed to ask
one question to Xavier to find out which of these three numbers he has
in mind. Xavier will answer this question only with the answers "yes",
"no", or "I don't know".Which question should Peter ask Xavier to
find out in one time, which number he has in mind?

Answers are expected as comments.

Average logical puzzle

You are reaching a junction that gets divided into 2 and you dont know the way to your destination. Two of your friends are standing at the junction. Of these two friends, one will tell lie all the time and the other will tell the truth always. You dont know who will tell the lie and truth. By asking 1 question to any of these friends, how will you get the correct way?


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Good Puzzle

There are 3 priests and 3 devils on one side of a river and all of them wants to go to the other side. There is one boat, for which atleast one is required for rowing. If at any time, the no. of devils at any side is more than the no. of priests at the corresponding side, then devils will kill the priests there. Max. number of persons allowed in boat is 2. After each travel in boat everybody in the boat should get down at corresponding side. How everybody can reach the other side safely?

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Average Puzzle

You are having 7 uniform burning rate sticks each of length 1m. Using a match box with match sticks and these sticks, how can you measure 1.75m?


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Average Puzzle

Suppose you are in a room with no metal objects except for two iron rods. Only one of them is a magnet.
How can you identify which one is a magnet? 


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Good Cricket Puzzle

In a cricket match, during a ball,which is not the last ball of an over; the following things happened

1) Batsman strike rotated.

2) Number of balls in score board is incremented by 1.

3) No runs was acquired in that ball.

How?

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Good Puzzle

In a Buddhist monastery there are N no. of monks and value of N is known to every monk. They have a head monk who does not belong to the N. One night the head monk puts a mark on heads of X number of monks out of N and the X is known only to head monk.Everybody knows X is not equal to 0. No form of communication is allowed between monks of monastery. The only time every body can  gather together is during lunch time. The head monk has told them that whoever understands that there is a dot in their head should not come for lunch from the next day onwards. How many days will the X monks take to realize that there is a dot in their head? How?


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Good Cricket Puzzle

Two Batsmen of a cricket match, each are individually at 94 runs score. Their team needs 7 runs for winning. 3 balls are pending. After the match both batsmen each are at individual score of 100(not out). How is this possible?


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Simple puzzle

How much time do a watch lose a day, if its hands coincide every 64min?


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Simple Logical Puzzle

How to stand behind somebody when he is already standing behind you?


Answers are expected as comments.