SISL APTITUDE QUESTIONS

All are multiple choice questions.60 questions to be answered in 60 mins.
 Distribution of questions:
---10 questions from data structures and some general topics.
-----10 questions from Unix and C.
--7Questions from Data base.
----Remaining from Windows(x windows,MS Windows etc..)
The distribution is not exact.Only approximate.
Totally there are six sections as below:
1.General
2.Unix and c
3.RDBMS
4.C++/object oriented
TCP/IP
6not remembered.
The questions are as follows:
RDBMS-----
1.What is RDBMS...Def
2.Two tables are given.In 1st table 2 columns are there.one
isEmployee no,second is salary.In second table 3 columns are there,one is employee no,second is date,3rd is salary.
Select employee no,from table1,table 2.
How many records it will contain?.(This is somewhat difficult).

3.What is transaction?
TCP/IP:
1.X.25 protocol belongs to which layer.
2,Order all the 7 layers in sequence
3,One node has 2 IP address but data goes through only one link.What is the reason?
4,Router,Bridge,Gateway....Which one of these can not connect
two different LANS and is protocol sensitive.
5,Client sends server---reqest or demand or -----Choices
are given.
Another section...
1.main(argc,argv)
{
  if(argc<1)
  printf("error");
  else
     exit(0);
     }
     If this program is compiled without giving any argument ,what it will print.
2.What are the static variables...def
3.What is Dynamic allocation ?
4.Dead lock condition...What may be the condition for it.
5.Semaphore variable?..def
6.Most of the Windows operating systems are....choices are given like
----a,maltitasking,multiuser,multi processing
b,only.......&......
c,only........&......
like that
7.Properties of object oriented,(just recall the name of the properties like
inheritance,....
8.A program of C++,and two questions were based on the o/p of that program.
.................---------.................