Q1 (Aptitude): “A train 150m long passes a pole in 15 seconds. Find the speed of the train in km/h.”

Answer: Speed = Distance / Time = 150 / 15 = 10 m/s. Convert to km/h: 10 × (18/5) = 36 km/h.

Why they ask: Speed-distance-time is the most repeated topic in TCS NQT aptitude. If you master this one category — trains, boats, relative speed — you cover 15–20% of the aptitude section. The math is never hard. The trap is misreading the question or forgetting unit conversions.

Q2 (Programming Logic): “What is the output of this code?”

int x = 5;
for(int i = 0; i < 3; i++) {
    x = x + i;
}
System.out.println(x); // Output: ?

Answer: x starts at 5. Iteration 1: x = 5 + 0 = 5. Iteration 2: x = 5 + 1 = 6. Iteration 3: x = 6 + 2 = 8. Output: 8.

Why they ask: This tests whether you can trace code execution mentally — not write code, just read it. Programming logic MCQs make up a significant portion of the NQT. Practice tracing loops, conditionals, and basic pointer/reference behavior in C or Java.

Q3 (Coding): “Write a program to check if a string is a palindrome”

public static boolean isPalindrome(String s) {
    int left = 0, right = s.length() - 1;
    while (left < right) {
        if (s.charAt(left) != s.charAt(right)) return false;
        left++;
        right--;
    }
    return true;
}

Why they ask: TCS NQT coding questions are basic — string manipulation, array operations, pattern printing. They test whether you can write working code, not solve LeetCode hards. If you can solve 50 easy-level problems on HackerRank, you are prepared for this section.

Q1: “Explain the four pillars of OOP with examples”

Why they ask: This is the #1 most asked question in TCS technical interviews. Every single candidate gets some version of this.

What most candidates say: “The four pillars are inheritance, polymorphism, abstraction, and encapsulation.” Then they recite textbook definitions and stop.

What the interviewer wants: Not textbook definitions. They want real code examples or analogies. If you say “polymorphism means many forms” and stop, you fail. If you say “polymorphism means I can call the same method draw() on a Circle object and a Rectangle object and each one behaves differently — that is runtime polymorphism through method overriding,” you pass. The difference between a reject and a select on this question is specificity.

Q2: “What is normalization? Explain up to 3NF with an example”

Why they ask: DBMS is tested in 80%+ of TCS technical interviews because most TCS projects involve databases. If you skip DBMS preparation, you are gambling with your interview.

Answer: Normalization reduces data redundancy. 1NF: atomic values, no repeating groups. 2NF: 1NF + no partial dependencies (every non-key column depends on the entire primary key). 3NF: 2NF + no transitive dependencies (non-key columns don't depend on other non-key columns).

How to stand out: Give a simple student-course example. Show a table with redundancy, then normalize it step by step. Interviewers love candidates who can draw a quick example on paper (or describe one clearly on a video call) instead of just reciting rules.

Q3: “Tell me about your final year project”

Why they ask: This is not a technical question — it is a communication test. They want to see if you can explain a technical project clearly in 3–5 minutes.

What they evaluate: Did you actually build it or just copy it? Can you explain the architecture? What was your specific contribution (if it was a team project)? What challenges did you face? What would you do differently?

Tip: If you cannot explain your project in simple terms to a non-technical person, you are not ready for this question. Practice explaining it to a friend who is not in your field. If they understand it, you are prepared.

Q4: “What is the difference between process and thread?”

Why they ask: OS basics are tested frequently in TCS technical interviews. Process vs thread, deadlock, and paging are the three most common OS topics.

Answer: A process is an independent program in execution with its own memory space. A thread is a lightweight unit of execution within a process that shares the process's memory. Multiple threads in the same process can communicate easily through shared memory, while processes need inter-process communication (IPC) mechanisms. The key practical difference: creating a thread is faster and uses less memory than creating a process, which is why web servers use thread pools to handle multiple requests.

Q1: “Tell me about yourself”

Why they ask: The most asked HR question at TCS. They want a 2-minute structured answer — not your life story from birth.

Bad answer: Reciting your resume chronologically starting from your 10th board results.

Good answer: “I am [Name], a final year [Branch] student at [College]. I have strong fundamentals in Java and DBMS, and my final year project was [brief description — one sentence]. I am interested in TCS because [specific reason — scale of projects, learning opportunities, specific technology practice].” Keep it under 2 minutes. Education → Skills → Project → Why TCS. That is the structure.

Q2: “Are you willing to relocate anywhere in India?”

Why they ask: This is a deal-breaker question. TCS posts employees across India — Chennai, Mumbai, Bangalore, Hyderabad, Pune, Kolkata, and smaller cities. They need flexibility from every hire.

The only correct answer: “Yes, I am willing to relocate.” If you say no or hesitate, you will likely be rejected. Even if you have a preference, express willingness first and mention preferences as secondary. TCS needs employees who can be deployed anywhere based on project requirements.

Q3: “Why TCS and not Infosys/Wipro/other companies?”

Why they ask: They want to hear something specific about TCS — not generic “it is a great company” answers that could apply to any employer.

Good answers: Mention TCS's specific technology practices (TCS BaNCS for banking, TCS iON for education), their training program (ILP — Initial Learning Program which is one of the best in the industry), their global presence (operations in 150+ countries), or a specific project or client you admire. Research one or two specific things about TCS before your interview — it takes 10 minutes and separates you from candidates who give generic answers.