HI....
I am 1.6 yrs Ex in c++ unix.....

I gave persistent exam in May 2008....

Written was conducted by Merittrac consultancy....
Aptitude was simple for C++ there was questions about friend functions,
templates, inheritance etc....

I had telephonic interview
1. How dynamic polymorphism works
2. If copy constructor is not there then what all things you can't do.
For this I told concept of copy constructor and why wee need but he said
NO....He said you can't do 
obj(obj1) which I think i preety obvious
Thts it no other C++ question.

3. Binary search Algorithm (its not binary search tree) doesn't works for
which data structure

4. There is a buffer and 4 threads are wrting on it and 2 threads are
reading from it. Tell what will be data structure for this buffer.

5. Do u know process scheduling algorithms.....he said u have to make your
own process scheduling algo what all parameters u will keep in mind.

6. What is throughput?

His main Emphasis was on OS.

7. When you click on yahoo mail a page drops saying Enter username and
passwd. Once u supply username and passwd it enters and if u open another
instance of browser it will not ask username passwd this time. So tell how
this thing is implimented?