First an online aptitude test of 1 hour is conducted

Why is the inverter so called?
Give as many itenaries as you can think of in designing a software for your cafetaria.
What is a flip flop?
Draw and explain d-flip flop.

Puzzle( There are 20 packets of cigarettes.The weight of each cigarette is 1 gram in every packet except 1 packet in which the weight of each cigarette is 1.1 gram. .You have a physical balance and just one chance to measure.How will you identify the odd packet?)
What do you do in your leisure time?
Which is the last book you have read?( Since my hobby was reading books)
What did you like in that book?
Why should we hire you?
Why do you want to join TCS?Who is your favourite teacher and why?
Define yourself.

1)Be confident and maintain a smile on your phase throughout the interview.
2)Never answer in monosyllables.
3)Remember interviewers rarely have a predetermined set of questions?
4)More than your answers the interviewer checks your approach to the problem.So be positive in answering.
5) Never try to bluff. Be clear and straightforward in answering .

knowledge of c,c++..java helped me...
also my project which had its application in software field...