TCS NQT Ninja Interview Questions 2026: Essential Technical & HR Questions to Crack the Interview

After clearing the TCS NQT written test, shortlisted candidates are invited for the Ninja interview process, which mainly consists of a Technical Round followed by an HR Round. These rounds evaluate a candidate’s core computer science knowledge, programming fundamentals, communication skills, and overall suitability for TCS.

This article focuses only on the Technical and HR interview questions commonly asked in the TCS NQT Ninja interview, based entirely on previously asked questions.

TCS NQT Ninja 2026 Interview Structure

Candidates who qualify the NQT exam go through the following interview rounds:

1. Technical Interview Round

• Duration: 20–30 minutes
• Focus: Core CS subjects and basic programming
• Applicable to both CS and non-CS candidates

2. HR Interview Round (Optional but Common)

• Duration: 15–20 minutes
• Focus: Communication skills, motivation, attitude, and cultural fit

TCS NQT 2026 Technical Interview Questions and Answers (Ninja)

1. Explain ACID properties in DBMS

ACID stands for Atomicity, Consistency, Isolation, and Durability. These properties ensure reliable database transactions. Atomicity ensures a transaction is fully completed or not executed at all. Consistency maintains valid database states. Isolation ensures concurrent transactions do not affect each other. Durability guarantees that committed data is permanently saved.

2. What is the DDL command in MySQL? Explain CREATE and ALTER

DDL (Data Definition Language) is used to define and modify database structures.

• CREATE is used to create databases and tables.
• ALTER is used to add, modify, or delete columns, constraints, or indexes in existing tables.
  DDL commands are auto-committed and permanently save changes.

3. What is the difference between DROP and TRUNCATE in SQL?

• DROP removes the entire table or database structure permanently.
• TRUNCATE deletes all records from a table but retains its structure.
  TRUNCATE is faster and does not support rollback.

4. What is the JIT compiler in Java?

The Just-In-Time (JIT) compiler improves Java program performance by converting bytecode into native machine code at runtime. This reduces execution time compared to interpretation alone.

5. What is the OOPS concept?

Object-Oriented Programming (OOPS) is based on creating and using objects. The four main principles are:

• Abstraction
• Encapsulation
• Inheritance
• Polymorphism

6. What is abstraction in OOPS?

Abstraction hides internal implementation details and exposes only essential functionality. It is implemented using abstract classes and interfaces in Java.

7. What is inheritance and its types in Java?

Inheritance allows a child class to acquire properties of a parent class using the extends keyword.
Types of inheritance in Java:

• Single Inheritance
• Multilevel Inheritance
• Hierarchical Inheritance

8. What is method overloading?

Method overloading occurs when multiple methods have the same name but different parameter lists. It helps achieve compile-time polymorphism.

9. Explain insertion sort

Insertion sort works by picking one element at a time and placing it in the correct position in the sorted part of the array.

• Best case: O(n)
• Average/Worst case: O(n²)
• Space complexity: O(1)

10. What is a linked list?

A linked list is a linear data structure where elements are stored in non-contiguous memory locations. Each node contains data and a pointer to the next node.
Types:

• Singly Linked List
• Doubly Linked List
• Circular Linked List

11. What is an operating system?

An operating system acts as an interface between users and hardware. It manages memory, processes, input/output operations, scheduling, and file systems.

12. What is a firewall and how does it work?

A firewall is a network security system that monitors and filters incoming and outgoing traffic based on predefined security rules. It blocks untrusted sources and allows authorized traffic.

13. What is the stack data structure and its operations?

A stack follows the LIFO (Last In First Out) principle.
Common operations:

• push()
• pop()
• peek()
• isEmpty()
• isFull()

14. What is a constructor in Java?

A constructor is a special method with the same name as the class. It initializes objects when they are created.
Types:

• No-argument constructor
• Parameterized constructor

15. Explain the TCP/IP model

TCP/IP is a connection-oriented protocol used for internet communication.
It has four layers:

1. Application Layer
2. Transport Layer
3. Internet Layer
4. Network Access Layer

16. What is cloud computing?

Cloud computing provides on-demand access to computing resources such as servers, storage, and databases over the internet. It reduces hardware and software dependency for users.

17. What are lists and tuples in Python? Explain the difference.

Lists and tuples are built-in data structures in Python used to store collections of elements. A list is mutable, meaning its elements can be changed after creation, and it is defined using square brackets. A tuple is immutable, meaning its elements cannot be modified once created, and it is defined using parentheses. Lists are generally used when data needs to be updated, while tuples are preferred when data should remain constant.

Python Questions in TCS NQT Ninja Technical Interview

Python is often chosen by freshers for the TCS NQT Ninja interview due to its simple syntax and wide usage in automation and scripting. Interviewers usually focus on fundamental Python concepts rather than advanced frameworks or libraries.

Commonly discussed topics include:

• Difference between lists and tuples
• Basic data types and variables
• Conditional statements and loops
• Functions and recursion
• Simple logic-based programs

Candidates are expected to clearly explain concepts such as mutability, data storage, and use cases, rather than just writing code.

👉 For a clear comparison frequently asked in interviews, refer to our detailed guide on List vs Tuple in Python.
👉 To revise more commonly asked basics, explore our Top 25 Python Interview Questions for Freshers, which covers essential Python concepts asked in entry-level interviews.

TCS NQT 2026 HR Interview Questions and Guidance (Ninja)

1. Tell us about yourself

Candidates should give a structured and concise introduction covering their educational background, core skills, and interests. It is effective to briefly mention a relevant project or achievement and conclude with why they are interested in starting their career with TCS.

2. What motivates you to work with TCS?

This question tests alignment with the organization. Candidates should relate their career goals, learning mindset, and technical interests with TCS’s work culture, long-term projects, and opportunities for skill development, rather than focusing on salary or brand name.

3. Why should we hire you?

Interviewers assess confidence and clarity through this question. A strong answer highlights technical fundamentals, willingness to learn, adaptability, and how the candidate can add value to the team while fitting into a professional, client-oriented environment.

4. What do you anticipate from the company?

Candidates should express positive expectations such as structured learning, exposure to real-world projects, and professional growth. The focus should remain on contribution and development, not on personal demands or unrealistic expectations.

5. What are your strengths and weaknesses?

Strengths should be relevant to the role and supported with brief examples, such as problem-solving or teamwork. When discussing weaknesses, candidates should be honest and clearly explain the steps they are taking to improve, showing self-awareness and maturity.

6. Are you comfortable relocating?

This question evaluates flexibility. Candidates should answer honestly while showing openness to organizational needs. Clear and transparent communication helps interviewers decide role and location suitability.

7. What are your hobbies?

Hobbies help interviewers understand personality beyond academics. Candidates should mention activities that demonstrate transferable skills like teamwork, discipline, creativity, or consistency, and briefly explain what they have learned from them.

8. Where do you see yourself in five years?

This question assesses long-term thinking and commitment. Candidates should link their future goals with skill enhancement, increased responsibilities, and growth within the organization, while remaining realistic and aligned with the role they are applying for.

Final Note for TCS NQT Ninja Candidates

The TCS NQT Ninja interview primarily tests fundamentals, not advanced specialization. Strong clarity in core subjects, honest communication, and confidence are sufficient to clear both the Technical and HR rounds.