Technical round questions?

There is nothing like important. But yes, I have few important questions for the Technical Round. But they are for EC branch. I hope it will help you.
 
1.       What is PCM?
2.       How does ADS works?
3.       What is Nyquist Criterion?
4.       Difference between AM and ASK?
5.       Layers of OSI and TCP models?
6.       What are the protocols used in each layers?
7.       What is Routing?
8.       Types of Routing?
9.       Which comes first OSI or TCP?
10.   What is the reason behind the creation of OSI?

These are the few questions but your concepts should be clear whatever your branch is. So, you have to cover your whole syllabus for this round.