NullClass Software Engineer Interview Questions and Answers

Q1. Basics of your technical skills
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Q1. More Projects related questions
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Q1. What are the differences between stored procedure and triggers in SQL?
Ans. 
Stored procedures are precompiled SQL statements that can be executed on demand, while triggers are automatically executed in response to specific events.
• Stored procedures are explicitly called by the user, while triggers are automatically invoked by the database system.

• Stored procedures can accept parameters and return values, while triggers cannot.

• Stored procedures can be executed independently, while triggers are al...read more
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Q2. What is a Kernel in OS
Ans. 
Kernel is the core component of an operating system that manages system resources and provides a bridge between hardware and software.
• Kernel is responsible for managing memory, processes, and device drivers.

• It provides an interface for applications to access hardware resources.

• Kernel operates in privileged mode and has direct access to the hardware.

• Examples of popular kernels are Linux kernel, Windows NT kernel, and ma
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Q3. What are access specifiers in c++
Ans. 
Access specifiers in C++ are keywords that determine the visibility and accessibility of class members.
• There are three access specifiers in C++: public, private, and protected.

• Public members are accessible from anywhere in the program.

• Private members are only accessible within the class itself.

• Protected members are accessible within the class and its derived classes.

• Access specifiers are used to enforce encapsulation a
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Q4. Explain about Polymorphism
Ans. 
Polymorphism is the ability of an object to take on many forms.
• It allows objects of different classes to be treated as if they were objects of the same class.

• It can be achieved through method overloading or method overriding.

• Example: A shape class can have different subclasses like circle, square, etc. and all can be treated as shapes.

• It helps in achieving code reusability and flexibility.
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Q5. Explain about operator overloading
Ans. 
Operator overloading allows operators to have different meanings based on the operands they work on.
• It allows operators to be used with user-defined data types

• It can simplify code and make it more readable

• Examples include using the + operator to concatenate strings or add numbers

• Operators can be overloaded for unary and binary operations
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Q6. Explain about encapsulation
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Encapsulation is the process of hiding implementation details and providing a public interface for accessing the object.
• Encapsulation helps in achieving data abstraction and information hiding.

• It prevents unauthorized access to the internal state of an object.

• It allows for better control over the data and its behavior.

• Example: A bank account class with private variables for balance and account number, and public method...read more
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Q7. Explain about your Projects?
Ans. 
I have worked on various projects involving web development, mobile app development, and data analysis.
• Developed a web application using React.js and Node.js for managing customer orders.

• Created a mobile app using Flutter for tracking daily expenses and generating expense reports.

• Implemented a data analysis tool using Python and SQL to analyze customer behavior and improve marketing strategies.
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Q1. What is your family background?
Ans. 
My family background is diverse and has influenced my values and perspectives.
• My parents come from different cultural backgrounds, which has exposed me to different traditions and languages.

• I have siblings who are also in the software engineering field, which has fostered a supportive and collaborative environment.

• My family has always encouraged education and personal growth, which has motivated me to pursue a career i
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Q2. Tell me about yourself.
Ans. 
I am a software engineer with experience in developing and maintaining software applications.
• I have a Bachelor's degree in Computer Science.

• I have worked on various projects using different programming languages such as Java, C++, and Python.

• I am skilled in software development methodologies like Agile and have experience with version control systems like Git.

• I have strong problem-solving and analytical skills, which h...read more
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Q3. What is your Native place?
Ans. 
My native place is a small town in the countryside known for its scenic beauty and peaceful environment.
• My native place is located in the outskirts of a major city.

• It is known for its rich cultural heritage and historical landmarks.

• The people in my native place are warm and welcoming.

• The local cuisine is famous for its unique flavors and traditional recipes.

• There are several tourist attractions in and around my native ...read more
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Q4. What is your favourite moment?
Ans. 
My favorite moment was when I successfully completed a complex software project ahead of schedule.
• Successfully completing a complex software project ahead of schedule

• Receiving positive feedback from clients and team members

• Seeing the impact of my work on improving efficiency or solving a problem

• Collaborating with a talented and supportive team

• Overcoming challenges and finding innovative solutions
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Q1. Explain about your projects
Ans. 
I have worked on various projects involving web development, mobile app development, and data analysis.
• Developed a web application using React.js and Node.js for managing customer orders.

• Created a mobile app using Flutter for tracking daily expenses and generating reports.

• Implemented data analysis algorithms in Python to analyze customer behavior and improve marketing strategies.
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Q2. Tell me about yourself
Ans. 
I am a software engineer with 5 years of experience in developing web applications using Java and JavaScript.
• 5 years of experience in software engineering

• Proficient in Java and JavaScript

• Developed web applications

• Strong problem-solving skills

• Experience with agile development methodologies
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Q1. Tell me about yourself.
Ans. 
I am a software engineer with experience in developing and maintaining software applications.
• I have a Bachelor's degree in Computer Science.

• I have worked on various projects using different programming languages such as Java, C++, and Python.

• I am skilled in software development methodologies like Agile and have experience with version control systems like Git.

• I have strong problem-solving and analytical skills, which h...read more
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There was 2 coding question
One was easy One was very Difficult
20 MCQ question from Operating system and DBMS

Q1. First question was binary search in unsorted arrays So here i have asked about sorting algorithms all sorting algorithms must be clear
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Q2. Second question was to find longest consecutive subarray.
Ans. 
Find the longest consecutive subarray.
• Iterate through the array and keep track of the current subarray length.

• Update the maximum length as you iterate.

• Reset the current subarray length when a non-consecutive element is encountered.
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Q1. OOPS related question Heap insertion deletion question Hashing Spanning tree
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Q2. Minimum Spanning tree Implementation of MST
Ans. 
Minimum Spanning Tree (MST) is a tree that connects all vertices in a graph with minimum total edge weight.
• MST can be found using Prim's algorithm or Kruskal's algorithm.

• Prim's algorithm starts with a single vertex and adds the closest vertex to the tree until all vertices are included.

• Kruskal's algorithm starts with the edges with the lowest weight and adds them to the tree as long as they don't create a cycle.

• MST has...read more
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Round duration - 60 minutes
Round difficulty - Medium

Q1. Sum Between Zeroes
You are given a Singly Linked List which contains a series of integers separated by ‘0’.
Between two zeroes, you have to merge all the nodes lying between them into a single node which...read more
Ans. Two Pointer Approach
Let us initialize two pointers, newHead and newTail, with NULL (These will be the head and tail of the final list). Now traverse the given list. Ignore the first zero. Now, as you encounter non-zero nodes, add their values in a variable called ‘sum’. As soon as you encounter a node with data 0, change that node's value to ‘sum’, and
1. If newHead is NULL, this node becomes the new head and tail of the l...read more
Answered by CodingNinjas
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Q2. Minimum Cost to Buy Oranges
You are given a bag of size 'W' kg and provided with the costs of packets with different weights of oranges as a list/array with the name 'cost'. Every i-th posi...read more
Ans. Recursive Approach
Write a recursive function minCostToBuyOrangesHelper(idx, requiredWeight, n) to return the Minimum cost to buy exactly requiredWeight Kg oranges with (idx+1) Kg to N kg packets.
1. Our minimum cost for weight W will be : minCostToBuyOrangesHelper(idx, W, n)
2. Now at any instant (idx, requiredWeight, n), we have two options:
   1. The option of taking this packet:
cost[idx] + minCostToBuyOrangesHelper(idx, requiredWe...read more
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Round duration - 60 minutes
Round difficulty - Medium

Q1. Connect N Ropes With Minimum Cost
You have been given 'N' ropes of different lengths, we need to connect these ropes into one rope. The cost to connect two ropes is equal to sum of their lengths. W...read more
Ans. Brute Force Approach
Clearly, the rope which is picked up first will be having its length included more than once in the final cost. If we pick a rope of larger length earlier, then we will be adding some extra cost to our final result.
So, the idea is to pick ropes of smaller lengths initially to minimize the impact on our final cost.
So, each time we will be finding two smallest ropes, connecting them and
adding the resu...read more
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Q2. DBMS Question
Tell the ACID properties in DBMS.
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