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# Puzzle Archives :: Interview Puzzles

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Interview Puzzles Practice Set 11

• 101 / 112

## 100 Bulbs and Switches

The college has two rooms, one is having 100 bulbs and another room has its switches. Switches don't have number/name written on it. New warden doesn't know the switches for the bulbs. How many trips he has to make to identify all the switches for the bulbs?

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• 102 / 112

Ten people land on a deserted island. There they find lots of coconuts and a monkey. During their first day, they gather coconuts and put them all in a community pile. After working all day they decide to sleep and divide them into ten equal piles the next morning. That night one castaway wakes up hungry and decides to take his share early. After dividing up the coconuts he finds he is one coconut short of ten equal piles. He also notices the monkey holding one more coconut. So he tries to take the monkey's coconut to have a total evenly divisible by 10. However when he tries to take it the monkey conks him on the head with it and kills him. Later another castaway wakes up hungry and decides to take his share early. On the way to the coconuts, he finds the body of the first castaway, which pleases him because he will now be entitled to 1/9 of the total pile. After dividing them up into nine piles he is again one coconut short and tries to take the monkey's slightly bloodied coconut. The monkey conks the second man on the head and kills him.

One by one each of the remaining castaways goes through the same process until the 10th person to wake up gets the entire pile for himself.

What is the smallest number of possible coconuts in the pile, not counting the monkeys?

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• 103 / 112

The captain of a ship was telling this interesting story: "We traveled the sea far and wide. At one time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly."

How can that be possible?

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• 104 / 112

A king wants his daughter to marry the smartest of 3 extremely intelligent young princes, and so the king's wise men devised an intelligence test. The princes are gathered into a room and seated, facing one another, and are shown 2 black hats and 3 white hats. They are blindfolded, and 1 hat is placed on each of their heads, with the remaining hats hidden in a different room. The king tells them that the first prince to deduce the color of his hat without removing it or looking at it will marry his daughter. A wrong guess will mean death. The blindfolds are then removed.

You are one of the princes. You see 2 white hats on the other prince's heads. After some time you realize that the other princes are unable to deduce the color of their hat, or are unwilling to guess. What color is your hat?

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• 105 / 112

A tourist visits a small town for his research. While in the town, he decides to get a haircut. Since the town is quite small, there are only two barbers in the town one on North Street and one on South Street. The barbershop on the North Street is a mess and the barber has a weird and pathetic haircut. While the barbershop at the South Street is pretty tidy and the barber as well as an impressive haircut.

Which barbershop will the tourist visit for his haircut and why?

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• 106 / 112

An innocent person is accused of a murder in a village. The head of the village knows that the man is innocent but he also knows that the truth may be uncovered one day that his own son is the murderer. Just to hinder the attention of people, he offers a chance to the man. In a jar, he places two chits of paper â€“ one reads innocent and the other reads guilty. Among all the other villagers, he asks the accused person to pick up a chit. He says that their almighty god is watching them and the person will meet his fate truthfully with the chit.

Of course, the village head is cheating. He has put both chits with Guilty written on them. The accused person somehow suspects the same. But no one will believe him if he tries to expose the head. Also, he knows no one will look at the other chit once his fate is decided by his selected chit.

What should he do to prove that he is innocent?

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• 107 / 112

In a party, there are five people and a whole round cake lying at the center of the table. Only four people will make a cut and take their piece and the last one will get the remaining piece on the table. How can they make sure that everyone gets a 1/5th of the piece?

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• 108 / 112

## Murder Crime Riddle

A dead body is found at the bottom of a multistory building. Seeing the position of the body it is evident that the person jumped off from one of the floors for attempting suicide.

A homicide detective is called to look after the case. He goes to the first floor and walks in the room facing the direction in which the body was found. He opens the window in that direction and flips a coin towards the floor.

Then he goes to the second floor and repeats the process. He keeps on doing it till the last floor. Then, when he climbs down, he tells the team that it is a murder, not suicide.

How did he come to know that it was a murder?

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• 109 / 112

Suppose you are sitting in an interview and the interviewee asks you an aptitude question.

You have three buckets with capacity 4 liters, 8 liters, and 10 liters and you have a large tank of water. Now you have to measure 3 liters of water precisely using those buckets. How will you do it?

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• 110 / 112

## Hard Calendar Puzzle

A contest is held on an international level in December 2013. The finale of it is between an American and a British kid. Only name and date have to be mentioned in the paper for checking purpose. But when the checkers check it, they find out that both of them have the same names. The papers cannot be told apart in any manner now.

What is the date of competition ?

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