TCS Interview Questions 2025

C is a procedural programming language, while C++ is an object-oriented programming language. C++ supports features like classes, objects, inheritance, polymorphism, and encapsulation, which are not present in C. C++ also supports function overloading and exception handling.

Polymorphism allows objects of different classes to be treated as objects of a common parent class. It comes in two types: Compile-time (Method Overloading) and Run-time (Method Overriding). It enables flexibility and code reusability.

SQL databases are relational, table-based, and use structured query language (e.g., MySQL, PostgreSQL). NoSQL databases are non-relational, document/key-value based, and offer flexible schemas (e.g., MongoDB, Cassandra). SQL is better for complex queries, while NoSQL is better for scalability and unstructured data.

A pointer is a variable that stores the memory address of another variable. It allows for direct memory manipulation and is used for dynamic memory allocation, arrays, and function arguments.

ACID stands for Atomicity, Consistency, Isolation, and Durability. These properties ensure reliable processing of database transactions. Atomicity ensures all-or-nothing execution, Consistency ensures data validity, Isolation ensures concurrent transactions don't interfere, and Durability ensures saved changes persist.

Normalization is the process of organizing data in a database to reduce redundancy and improve data integrity. It involves dividing large tables into smaller, related tables (1NF, 2NF, 3NF, BCNF).

JDK (Java Development Kit) is the full development environment. JRE (Java Runtime Environment) is the environment to run Java applications. JVM (Java Virtual Machine) is the engine that executes Java bytecode. JDK contains JRE, and JRE contains JVM.

A deadlock is a situation where two or more processes are unable to proceed because each is waiting for the other to release a resource. It typically happens in multi-processing systems.

Cloud computing is the delivery of computing services—including servers, storage, databases, networking, software, analytics, and intelligence—over the Internet ("the cloud") to offer faster innovation, flexible resources, and economies of scale.

bool isPrime(int n) {
    if (n <= 1) return false;
    for (int i = 2; i * i <= n; i++) {
        if (n % i == 0) return false;
    }
    return true;
}

Start with your name, educational background, and key skills. Mention your projects and internships relevant to the role. Keep it concise (1-2 minutes) and professional.

Highlight TCS's global reputation, commitment to innovation, and employee training programs. Mention how TCS aligns with your career goals and values. "I admire TCS's focus on digital transformation and its supportive work culture..."

Be honest. If you are flexible, say "Yes, I am open to relocating as it will give me an opportunity to explore new places and cultures while working." Flexibility is highly valued in IT service companies.

Strengths: Adaptability, quick learner, team player. Weaknesses: "I sometimes focus too much on details" (always follow up with how you are improving it).

"I see myself as a senior developer/lead, having mastered [specific technologies] and contributing significantly to the company's major projects. I also hope to mentor junior developers."