Vitwit Interview Questions and Answers

Q1. Opps concepts in python
Ans. 
Object-oriented programming concepts in Python
• Encapsulation: bundling data and methods together in a class

• Inheritance: creating new classes from existing ones

• Polymorphism: using a single interface to represent different types

• Abstraction: hiding complex implementation details

• Class: blueprint for creating objects

• Object: instance of a class
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Q2. OS and CN concepts
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Q3. Python data types
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Q4. Page replacement methods in os
Ans. 
Page replacement methods are algorithms used by operating systems to decide which pages to evict from memory when a new page needs to be loaded.
• Page replacement methods are used in virtual memory systems to manage limited physical memory.

• The goal is to minimize the number of page faults, which occur when a requested page is not in memory.

• Popular page replacement algorithms include FIFO (First-In, First-Out), LRU (Least...read more
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Given 5 coding questions and 20 subject oriented questions on ComputerNetworks,Operating Systems and so on

Q1. Technical Interview followed by logic explanation of a coding question
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Q2. Integer to Roman number
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Sudo codes were asked to wite the output

Q1. Intduction was asked firstly
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Q2. Had any knowledge on blockchain
Ans. 
Yes, I have knowledge on blockchain.
• I have experience in developing smart contracts using Solidity.

• I have worked on blockchain platforms like Ethereum and Hyperledger Fabric.

• I understand the concepts of distributed ledger technology and consensus algorithms.

• I am familiar with the security aspects of blockchain and how to prevent attacks like 51% attack.

• I have implemented blockchain solutions for supply chain management...read more
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Q3. What is blockchain and applications
Ans. 
Blockchain is a decentralized, secure and transparent digital ledger that records transactions and stores data.
• Blockchain is used in cryptocurrency transactions like Bitcoin and Ethereum.

• It can also be used in supply chain management, voting systems, and digital identity verification.

• Blockchain provides security through cryptography and consensus algorithms.

• It eliminates the need for intermediaries and reduces transact...read more
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Q4. In java what is hashmap
Ans. 
HashMap is a class in Java that implements the Map interface and stores key-value pairs in a hash table.
• HashMap allows null values and only one null key.

• It provides constant-time performance for basic operations such as get and put.

• The order of elements in a HashMap is not guaranteed.

• Example: HashMap<String, Integer> map = new HashMap<>(); map.put("apple", 1); map.put("banana", 2); int value = map.get("bana...read more
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Q5. In os job shechduling algo
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Q6. Whats are hashtables
Ans. 
Hashtables are data structures that store key-value pairs and allow for fast retrieval of values based on their keys.
• Hashtables use a hash function to map keys to indices in an array.

• Collisions can occur when multiple keys map to the same index, which can be resolved using techniques like chaining or open addressing.

• Hashtables have an average time complexity of O(1) for insertion, deletion, and retrieval of values.

• Exam...read more
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