Dixit Infotech Services Interview Questions and Answers for Freshers

Q1. What are operating systems, and what are the different types of operating systems?
Ans. 
Operating systems manage computer hardware and software, providing a user interface and enabling application execution.
• 1. System Software: Manages hardware and software resources (e.g., Windows, macOS, Linux).

• 2. Application Software: Performs specific tasks for users (e.g., Microsoft Office, Adobe Photoshop).

• 3. Real-Time Operating Systems (RTOS): Used in embedded systems for time-sensitive tasks (e.g., VxWorks, FreeRTO...read more
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Q2. What is the difference between LAN and Wi-Fi?
Ans. 
LAN is a wired network for local devices, while Wi-Fi is a wireless technology for connecting devices to a network.
• LAN (Local Area Network) typically uses Ethernet cables to connect devices, providing stable and high-speed connections.

• Wi-Fi (Wireless Fidelity) allows devices to connect to a network without physical cables, using radio waves.

• LAN is often used in offices or homes for desktop computers, printers, and serv...read more
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Q3. What are the main aspects you would like to discuss regarding the COVID-19 pandemic?
Ans. 
Discussing the COVID-19 pandemic involves its impact on health, economy, technology, and workplace dynamics.
• Health Impact: Discuss the strain on healthcare systems and the importance of vaccinations.

• Economic Consequences: Explore job losses and shifts in market dynamics, such as the rise of e-commerce.

• Remote Work: Highlight the transition to remote work and its effects on productivity and work-life balance.

• Technology A...read more
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Q1. What is bios explain
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Q2. Explain cloud service providers
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SQL questions and query output.

Q1. I had interview on SQL and pl SQL. So the interview started with basic sql questions and then level increased. Question were asked on joins, union, rank, dense rank. Indexes, triggers. I was asked to ri...read more
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Round duration - 30 minutes
Round difficulty - Medium

This was a MCQ round. 30 ques in 30 mins consisting of difficult quantitative aptitude questions were to be solved.

Round duration - 60 minutes
Round difficulty - Medium

In this test round, 2 coding questions were given. Either write the code or pseudo code

Q1. 
N Queens Problem
Given an integer N, find all possible placements of N queens on an N x N chessboard such that no two queens threaten each other.
Explanation:
A queen can attack another queen if they ar...read more
Ans. 
The N Queens Problem involves finding all possible placements of N queens on an N x N chessboard without threatening each other.
• Use backtracking algorithm to explore all possible configurations.

• Keep track of rows, columns, and diagonals to ensure queens do not threaten each other.

• Generate all valid configurations and print them out.
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Q2. 
Sort 0 1 2 Problem Statement
Given an integer array arr of size 'N' containing only 0s, 1s, and 2s, write an algorithm to sort the array.
Input:
The first line contains an integer 'T' representing the n...read more
Ans. 
Sort an array of 0s, 1s, and 2s in linear time complexity.
• Use three pointers to keep track of 0s, 1s, and 2s while traversing the array.

• Swap elements based on the values encountered to sort the array in-place.

• Time complexity should be O(N) and space complexity should be O(1).
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Round duration - 60 minutes
Round difficulty - Easy

This was a technical round with questions on DSA.

Q1. 
Reverse Words in a String: Problem Statement
You are given a string of length N. Your task is to reverse the string word by word. The input may contain multiple spaces between words and may have leading o...read more
Ans. 
Reverse words in a string while handling leading, trailing, and multiple spaces.
• Split the input string by spaces to get individual words

• Reverse the order of the words

• Join the reversed words with a single space in between
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Q2. 
Circular Linked List Detection
You are provided with the head of a linked list containing integers. Your task is to determine if the linked list is circular.
Note:
• A linked list is considered circula...read more
Ans. 
Detect if a given linked list is circular by checking if it forms a closed loop.
• Traverse the linked list using two pointers, one moving at double the speed of the other.

• If the two pointers meet at any point, the linked list is circular.

• If the faster pointer reaches the end of the list (NULL), the linked list is not circular.
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Round duration - 30 minutes
Round difficulty - Easy

HR round with typical behavioral problems.