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30+ Jbn Enterprises Interview Questions and Answers

Updated 12 Jan 2025
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Q1. MegaPrime Numbers Problem Statement

Given two integers Left and Right, determine the count of 'megaprime' numbers within the inclusive range from 'Left' to 'Right'. A 'megaprime' number is a prime number where ...read more

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Q2. Majority Element - II Problem Statement

You are given an array ARR of integers of length N. Your task is to find all the elements that occur strictly more than floor(N/3) times in the given array.

Input:

The fi...read more
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Q3. Bottom View of Binary Tree

Given a binary tree, determine and return its bottom view when viewed from left to right. Assume that each child of a node is positioned at a 45-degree angle from its parent.

Nodes in...read more

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Q4. Jump Game Problem Statement

In this problem, you are given an array ARR consisting of N integers. Your task is to determine the minimum number of jumps required to reach the last index of the array N - 1. At an...read more

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Q5. Alien Dictionary Problem Statement

You are provided with a sorted dictionary (by lexical order) in an alien language. Your task is to determine the character order of the alien language from this dictionary. Th...read more

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Q6. Chocolate Distribution Problem

You are given an array/list CHOCOLATES of size 'N', where each element represents the number of chocolates in a packet. Your task is to distribute these chocolates among 'M' stude...read more

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Q7. Is Binary Heap Tree Problem Statement

You are given a binary tree of integers. Your task is to determine if it is a binary heap tree or not.

Input:

The first line of input contains an integer ‘T’ denoting the n...read more
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Q8. Minimum Steps for a Knight to Reach Target

Given a square chessboard of size 'N x N', determine the minimum number of moves a Knight requires to reach a specified target position from its initial position.

Expl...read more

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Q9. Find the Missing Number in an Arithmetic Progression

You are given a sorted array consisting of ‘N’ distinct integers, forming a nearly complete Arithmetic Progression, except for one missing element. Your task...read more

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Q10. Design a class which has director, HOD, Professor and students. They all are reporting to their respective heads. I have to display the hierarchy structure of the information in a Site

Ans.

Design a class hierarchy for director, HOD, Professor and students reporting to their respective heads.

  • Create a base class for all employees with common attributes and methods

  • Create derived classes for director, HOD, Professor and students

  • Implement reporting hierarchy using pointers or references

  • Display hierarchy structure on the site using a tree or graph

  • Consider adding additional attributes and methods as needed

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Q11. Mention any five operating systems which have been derived from UNIX

Ans.

Five operating systems derived from UNIX are...

  • Linux

  • macOS

  • Solaris

  • FreeBSD

  • Android

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Q12. How would I defend myself if I were to get caught for having downloaded torrents?

Ans.

Defending oneself for downloading torrents

  • Explain that downloading torrents is illegal but common

  • Admit to the mistake and show remorse

  • Explain that you were not aware of the consequences

  • Promise to delete all downloaded content and not repeat the mistake

  • Offer to pay any fines or penalties

  • Consult a lawyer for legal advice

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Q13. Throw some light on what is happening inside Large Hadron Collider in CERN

Ans.

The Large Hadron Collider is a particle accelerator used to study the smallest known particles and their interactions.

  • The LHC is a circular tunnel located underground in Switzerland and France.

  • It accelerates particles to nearly the speed of light and then collides them together.

  • Scientists study the debris from these collisions to learn about the fundamental building blocks of the universe.

  • The LHC has been used to discover the Higgs boson particle and search for evidence of da...read more

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Q14. Various sections of memory stack, heap, data. Explain them using a code

Ans.

Explanation of memory sections: stack, heap, data

  • Stack: stores function calls and local variables

  • Heap: dynamically allocated memory

  • Data: global and static variables

  • Example: int x; //data, int *y = new int; //heap, void foo() { int z; } //stack

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Q15. What is a torrent? What are seeders and leechers?

Ans.

A torrent is a file-sharing method that allows users to download and upload files simultaneously. Seeders are users who have the complete file and upload it to others. Leechers are users who are downloading the file.

  • Torrents are a peer-to-peer file-sharing method

  • Users download and upload files simultaneously

  • Seeders have the complete file and upload it to others

  • Leechers are users who are downloading the file

  • The more seeders, the faster the download

  • Popular torrent clients inclu...read more

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Q16. What is Time complexity for insertion of node in Binray tree?

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Q17. What do I know about Higgs boson?

Ans.

Higgs boson is a subatomic particle that gives mass to other particles.

  • Higgs boson was first theorized in the 1960s by physicist Peter Higgs.

  • It was finally discovered in 2012 by the Large Hadron Collider.

  • The discovery of the Higgs boson confirmed the Standard Model of particle physics.

  • The Higgs boson is sometimes referred to as the 'God particle'.

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Q18. Find the endianess of a machine using a function

Ans.

A function to determine the endianess of a machine

  • Create a variable with value 1

  • Cast the variable to a byte array

  • If the first byte is 1, the machine is little endian, else big endian

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Q19. Mention any five file compression extensions

Ans.

Five file compression extensions

  • .zip

  • .rar

  • .7z

  • .tar.gz

  • .tar.bz2

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Q20. Give the full form of BIOS

Ans.

BIOS stands for Basic Input/Output System.

  • BIOS is a firmware that initializes hardware during the boot process.

  • It provides a low-level interface between the hardware and the operating system.

  • BIOS settings can be accessed and modified through a setup utility.

  • BIOS can be updated to fix bugs or add new features.

  • Examples of BIOS manufacturers include AMI, Phoenix, and Award.

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Q21. Give a real world application of linked lists

Ans.

A real world application of linked lists is in music playlists.

  • Linked lists can be used to create playlists where each song is a node pointing to the next song.

  • This allows for easy insertion and deletion of songs without having to shift the entire playlist.

  • Popular music streaming services like Spotify and Apple Music use linked lists to manage playlists.

  • Linked lists can also be used in video playlists, where each video is a node pointing to the next video.

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Q22. Profit on sale of asset impact on financial statements

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Q23. Given list of strings, group them as anagrams and return the list.

Ans.

Group list of strings as anagrams and return the list.

  • Create a hashmap to store sorted strings as keys and list of anagrams as values

  • Iterate through the list of strings, sort each string and add it to the corresponding list in the hashmap

  • Return the values of the hashmap as the grouped anagrams

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Q24. Differentiate between LED, LCD, and Plasma TV

Ans.

LED, LCD, and Plasma are types of televisions that differ in their display technology.

  • LED TVs use light-emitting diodes to backlight the display.

  • LCD TVs use liquid crystal displays to create images.

  • Plasma TVs use tiny cells filled with gas to create images.

  • LED TVs are more energy-efficient and have better contrast than LCD TVs.

  • LCD TVs are thinner and lighter than Plasma TVs.

  • Plasma TVs have better color accuracy and wider viewing angles than LCD TVs.

  • LED TVs are the most popula...read more

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Q25. Differentiate between HTTP and HTTPS

Ans.

HTTP is unsecured while HTTPS is secured with SSL/TLS encryption.

  • HTTP stands for Hypertext Transfer Protocol while HTTPS stands for Hypertext Transfer Protocol Secure.

  • HTTP operates on port 80 while HTTPS operates on port 443.

  • HTTP is vulnerable to attacks like man-in-the-middle and eavesdropping while HTTPS is secure against such attacks.

  • HTTPS uses SSL/TLS encryption to protect the data transmitted between the client and server.

  • HTTPS is indicated by a padlock icon in the brows...read more

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Q26. What is worst case time complexity of merge sort?

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Q27. Thrashing and why it occurs

Ans.

Thrashing occurs when a computer's performance suffers due to excessive swapping of data between RAM and virtual memory.

  • Thrashing happens when the system is overburdened with too many processes and there is not enough physical memory to handle them.

  • The operating system starts swapping data between RAM and virtual memory, which slows down the system.

  • This can lead to a vicious cycle where the system spends more time swapping than executing processes, causing further slowdowns.

  • T...read more

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Q28. Explain indexing mechanism in DBMS

Ans.

Indexing mechanism in DBMS is used to improve the performance of database queries by reducing the time taken to search for data.

  • Indexes are created on one or more columns of a table

  • They are used to speed up the search for data by creating a separate data structure that allows for faster access to the data

  • Indexes can be created using different algorithms such as B-tree, hash, and bitmap

  • Indexes can be clustered or non-clustered

  • Clustered indexes determine the physical order of d...read more

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Q29. What is P2P network?

Ans.

P2P network is a decentralized network where peers communicate and share resources directly without a central server.

  • P2P stands for peer-to-peer.

  • It allows for direct communication and sharing between peers without the need for a central server.

  • Examples include BitTorrent, Bitcoin, and Skype.

  • P2P networks are often used for file sharing, messaging, and cryptocurrency transactions.

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Q30. Median of two sorted arrays

Ans.

Finding median of two sorted arrays

  • Merge the two arrays and find the median

  • Use binary search to find the median in O(log(min(m,n))) time

  • Divide both arrays into two parts and compare the medians to discard half of the elements

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