30+ Jbn Enterprises Interview Questions and Answers

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

Five operating systems derived from UNIX are...

• Linux

• macOS

• Solaris

• FreeBSD

• Android

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

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

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

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

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'.

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

Five file compression extensions

• .zip

• .rar

• .7z

• .tar.gz

• .tar.bz2

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.

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.

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

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

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

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

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

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.