nVidia Placement Paper

The paper consisted of only objective questions.
there were 4 sections.aptitude,c,c++,Os,Data structure.the total time was one and half an hour. The paper was really difficult and also the time was very less according to total no. of questions asked.
They asked 75 questions.Aptitude-10 c->20 c++->15 data structure ->15
OS-15.
Questions in aptitude were a kind of less hard as compared to the technical questions.
There was cutoff for all the sections.
There were 3-4 logical reasoning in the aptitude sections.
In C there were questions from all sections like endianess, pointer,linked list,storage class.
In c++ there was question what will happen if i say "delete this".
the conceptual question about constructor and destructor.The questions were not very straight except one or two.there was a typical question that what are the operators that can't be overloaded?
In data structure section there was a question on what should be the good formula for rear and front in a circular queue in terms of size?
there was/were 1-2 question/s on sorting.
In Os there was a question on Cathe given hit ratio.What is thrashing?
What is the safe state given the resources and process holding resources?
The interview was very tough.In interview they firstly asked about the projects in detail. Then they asked graphix and other courses.If a student didn't do the graphix course still they asked about the course.
Finally two got the offer.