Amazon Intern Interview questions

Amazon Internship Interview Round 1

1. There are two urns A and B and an equal number of red balls and blue balls.How do u place the balls in the urns such that the probability of picking up the red ball is greater?
   


2. Two trains enter at the opposite sides of a tunnel of length L with speeds 'V'. A particle enters the tunnel at the same time with a speed 'v' and it vibrates in the tunnel[i.e. if it reaches the end of the tunnel then it comes back]. What is the position of the particle by the time the 2 trains meet?
   


3. Write an sql query to sort a table according to the amounts in a row and find the second largest amount.
   


4. How do you kill a process?
   


5. What is the functionality of a top command?
   


6. Given an array of size n+1 which contains all the numbers from 1 to n.Find the number which is repeated in O(n) time.How do you proceed with the same with floating numbers from 0 to 1 instead of 1 to n?
   


7. Design a datastructure to represent the movement of a knight on a chess board
   


8. Write an algorithm to traverse a knight covering all the squares on a chessboard starting at a particular point.
   

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Amazon Internship Interview Round 2

1. Why do you like to work with us?
   


2. What work are you expecting?
   


3. Tell me about any of your experience