Johns Hopkins University Interview Questions and Answers

Q1. First round will be of written examination in the concerned subject. The first 20 questions are for +4 marks for each correct answer and -1 for wrong answer. The next 10 questions will carry+6 marks for co...read more
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Q2. Written examination followed as described above
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Q1. The 2nd round will be of one to one demonstration of a topic. The process allows you to talk for 30 minutes uninterrupted and later followed by Viva voce on the same topic or a different topic
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Q1. HR round usually asks about your previous experience and your interest to work for their organisation.
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Good with easy questions

Q1. Questions around my projects
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Q1. Salary discussion round with HR
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Q1. Coding question: Given a sorted array of numbers. All numbers have freq of 2 in array except one number. Find that number with T.C of logn
Ans. 
Find the single number in a sorted array with frequency of 2 for all other numbers.
• Use binary search to find the number with different frequency.

• Check if the mid element is at even or odd index to determine which side to search next.

• Example: Input array [1, 1, 2, 2, 3, 3, 4, 4, 5] should return 5.
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Q2. Print left view of tree
Ans. 
Print the left view of a tree by traversing the tree from left to right at each level
• Traverse the tree using level order traversal

• Print the first node at each level encountered during traversal
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Q1. Detailed discussion on projects
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Q2. Questions on O.S like about deadlocks,etc..
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Q1. Basic questions for ADF
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Q1. Basic HR round for CTC and notice period
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Q1. What is the XPath?
Ans. 
XPath is a query language used for selecting nodes from an XML document.
• XPath stands for XML Path Language

• It is used to navigate through elements and attributes in an XML document

• XPath uses path expressions to select nodes or node-sets in an XML document

• Example: /bookstore/book[1]/title selects the title of the first book in a bookstore
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Q2. Difference between static and non-static?
Ans. 
Static variables are shared among all instances of a class, while non-static variables belong to individual instances.
• Static variables are declared using the 'static' keyword, while non-static variables are not.

• Static variables are initialized only once at the start of the program, while non-static variables are initialized each time an instance is created.

• Static variables can be accessed using the class name, while no...read more
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