CBSE Board Class 11 Computer Science Previous Year Question Papers 2008

Previous Paper – 2008
Class – XI
Subject – Computer Science


1. What is an operating system? Give few o/s available. 1

2. What is a compiler? 1

3. What is a file? 1

4. Define a Process. 1

5. What is FIFO? 1

6. Define lexical. List few with examples. 1

7. Name three types of debugging errors. 1

8. Who developed the C ++ Programming language? 1

9. List any four internal Dos commands. 1

10. What is a class? Give one example. 1

11. What is the difference between „x‟ and “x” in c++? 2

12. What are Variables? Give examples using data types. 2

13. What is the difference between int and float data type? 2

14. What are the uses of these punctuators { } , ; [ ] ?

15. Define a stream and insertion operator in C++.

16. What is # include directive? What happens if iostream.h
        is not included in a program ?

17. What will be the output of the following program?

# include <iostream.h>
int i=20;
void main()
{
int i=7;
cout<< i<< “ “ << : : I << endl;
}

18. How will you include comments in c++? How many types of
comments are there in c++ language?

19. What are Unary and Binary operators? Give example

20. What is the difference between num=10; and num==10;?
What is an assignment operator?

21. Write a program to enter marks in three subjects and calculate
total and assign grade „A‟ if total is > =200 else assign grade „B‟ .

22. What are the sequence, iteration & Selection construct in c++?

23. What is difference between logical & syntax errors?
Give their examples

24. What is the difference between return ( ) and exit ( ) statement?

25. What is the difference between break and continue statement?

26. Write a program to find factorial of a number using While loop. 4

27. Find the syntax errors, if any in the following: 4

main()
{
int r w =90;
while(w>60);
{
r=w-50;
switch(w)
{
20: cout<< “lower range” <<endl
30: cout<<” middle range”<< endl;
}
}

28. Describe switch statements .What is the difference between if
and switch statements.

29. Write a for loop which will produce the following output.
4
4
1
22
333
4444
55555

30. a) . Explain local and global identifiers in a c++ program.
b) . What is a logical operator? Give examples.
31. a) . Define arrays and pointers with simple exression.
b) . Define the terms Polymorphism & Inheritance.