TCS Associate System Engineer Trainee Interview Questions and Answers for Freshers

Q1. What is oops concepts in Java
Ans. 
Oops concepts in Java refer to Object-Oriented Programming principles like Inheritance, Encapsulation, Polymorphism, and Abstraction.
• Inheritance: Allows a class to inherit properties and behavior from another class.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Polymorphism: Ability of a method to do different things based on the object it is acting upon.

• Abstraction: Hiding the imp...read more
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Q2. What is a collections in java
Ans. 
Collections in Java refer to classes and interfaces that implement data structures like lists, sets, and maps.
• Collections provide a way to store and manipulate groups of objects in Java

• Examples include ArrayList, LinkedList, HashSet, and HashMap

• Collections framework includes interfaces like List, Set, Map, and classes like ArrayList, HashSet, and HashMap
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Q3. What is list and set in java
Ans. 
List and Set are both interfaces in Java used to store collections of elements, but with different characteristics.
• List is an ordered collection that allows duplicate elements, while Set is an unordered collection that does not allow duplicates.

• List implementations include ArrayList, LinkedList, and Vector, while Set implementations include HashSet, TreeSet, and LinkedHashSet.

• List allows access to elements by index, wh...read more
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Q4. Write. Program of palindrome program
Ans. 
A palindrome program checks if a given string reads the same forwards and backwards.
• Create a function that takes a string as input

• Remove any spaces and convert all characters to lowercase

• Compare the string with its reverse to check if it is a palindrome
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Q5. Write a program of prime numbers
Ans. 
Program to generate prime numbers
• Create a function to check if a number is prime

• Iterate through numbers and check for prime numbers

• Store prime numbers in an array
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Q6. What is inheritance and what is class and object
Ans. 
Inheritance is a concept in object-oriented programming where a class can inherit attributes and methods from another class. A class is a blueprint for creating objects, while an object is an instance of a class.
• Inheritance allows a class to reuse code from another class, promoting code reusability and reducing redundancy.

• A class is a template or blueprint for creating objects, defining attributes and methods.

• An object...read more
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Coding round test in tech Mahindra

Learn some coding language like python and Java
And SAP ABAP

Q1. What is the use of static word in java
Ans. 
Static keyword in Java is used to create class-level variables and methods.
• Static variables and methods belong to the class rather than the instance of the class.

• Static variables are initialized only once at the start of the program.

• Static methods can be called without creating an instance of the class.

• Static keyword can also be used to create static blocks that are executed only once when the class is loaded.

• Example: ...read more
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Q2. Can we implement multiple interfaces in a single Java class?
Ans. 
Yes, Java supports multiple interface implementation in a single class.
• A class can implement multiple interfaces separated by a comma.

• All the methods of the implemented interfaces must be implemented in the class.

• Example: public class MyClass implements Interface1, Interface2 { }
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Q3. What is the “Diamond problem” in Java?
Ans. 
Diamond problem is a multiple inheritance issue in Java where two classes have a common parent class and a subclass inherits from both.
• Occurs when two classes have a common parent class and a subclass inherits from both

• Results in ambiguity and conflicts in method and variable resolution

• Solved in Java by implementing interfaces instead of multiple inheritance
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Random topic like : women empowerment

Q1. What productivity work you did during covid ?
Ans. 
During covid, I implemented automation tools to streamline processes and improve efficiency.
• Implemented automation tools to streamline processes

• Improved efficiency by reducing manual tasks

• Collaborated with team members remotely to ensure project progress
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Q2. Why you want join DXC?
Ans. 
I want to join DXC because of its reputation for innovation and growth opportunities.
• DXC is known for its cutting-edge technology solutions

• I am excited about the potential for career advancement at DXC

• I admire DXC's commitment to excellence in the industry
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Q1. Blue screen of death
Ans. 
Blue screen of death is a Windows operating system error screen that appears when a system error occurs.
• Blue screen of death (BSOD) is a stop error screen that appears when the Windows operating system encounters a critical error and cannot recover.

• It is often caused by hardware failures, driver issues, or software problems.

• BSOD displays a specific error code and sometimes a brief description of the problem to help dia...read more
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Q2. Difference between RAM , ROM.
Ans. 
RAM is volatile memory used for temporary storage, while ROM is non-volatile memory used for permanent storage.
• RAM stands for Random Access Memory and is used for temporary storage of data and program instructions.

• ROM stands for Read-Only Memory and is used for permanent storage of firmware and software that rarely changes.

• RAM is faster but loses data when power is turned off, while ROM is slower but retains data even ...read more
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Basic aptitude questions (amcat)

Pseudo codes (basic) on Java and C

Q1. Self intro Why mech to it? Preferred programming language...
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Q2. Basic questions on programming language. Education gaps?
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Round duration - 140 minutes
This round was based on Aptitude, Verbal, logical reasoning, essay writing and 2 coding questions(easy).
This year instead of providing a separate section for quants, logical and verbal there is only one section i.e; Aptitude Section, which will include all the three-section having some questions from every section.

Q1. Aptitude Test (48 mins) Quants Verbal Logical Coding (60 mins) C C++ JAVA Python
Ans. 
Question about aptitude test and coding languages for System Engineer position.
• The question is about the aptitude test which includes quants, verbal, logical, and coding.

• The coding section includes C, C++, JAVA, and Python.

• The candidate should be familiar with all the mentioned languages.

• The time limit for the aptitude test is 48 minutes and for the coding section is 60 minutes.
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Q2. Written Communication Test (20 mins)
Ans. 
Describe the process you follow to troubleshoot a system issue.
• Identify the problem and gather information

• Analyze the data and determine possible causes

• Develop and implement a solution

• Test the solution and verify if it resolves the issue

• Document the process and solution for future reference
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Round duration - 30 minutes
This is basically an Interview round which is to know about the technical skills of the candidate.

Q1. Tell me about yourself.
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Q2. OOPs concepts with implementation
Ans. 
OOPs concepts are fundamental to software engineering. They include inheritance, polymorphism, encapsulation, and abstraction.
• Inheritance allows a class to inherit properties and methods from a parent class.

• Polymorphism allows objects to take on multiple forms and behave differently based on the context.

• Encapsulation is the practice of hiding implementation details and exposing only necessary information.

• Abstraction is...read more
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Q3. SQL (joins, basic queries)
Ans. 
SQL joins and basic queries
• Joins are used to combine data from two or more tables based on a related column

• Basic queries include SELECT, FROM, WHERE, GROUP BY, HAVING, and ORDER BY clauses

• Use aliases to simplify column names and improve readability

• Avoid using SELECT * as it can slow down the query

• Use indexes to improve query performance
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Q4. Difference between list and array

Ans. 

Arrays are fixed in size and can store multiple data types, while lists are dynamic and can only store one data type.

• Arrays are declared with a fixed size, while lists can grow or shrink dynamically.

• Arrays can store multiple data types, while lists can only store one data type.

• Arrays are accessed using an index, while lists are accessed using an iterator.

• Example: int[] arr = new int[5]; List list = new ArrayList<>();

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