Test Papers / Previous Question Papers of IGNOU CS63 Introduction to System Software December 2005

BACHELOR IN COMPUTER APPLICATIONS
Term-End Examination

December, 2005

CS63 (S) : INTRODUCTION TO SYSTEM SOFTWARE

Time: 2 hours
Maximum Marks: 60

1. (a) What is a loader ? Mention the functions performed by a loader. Explain the Dynamic loading scheme. (7)

(b) Write an algorithm and draw a corresponding flow chart to sort the given list of numbers in ascending order. (7)

(c) What is virtual memory ? What are its advantages ? How can a virtual memory be implemented using the demand paging scheme ? Explain with the help of a diagram. (10)

(d) Write UNIX commands for the following :(6)
(i) to direct the output to the file as well as to the screen
(ii) to send a message to the logged in user
(iii) to set command execution priority
(iv) to display information about the commands
(v) to print the calendar for any year and month
(vi) to run a process in background

2. (a) With the help of a diagram, explain the structure of an editor. (5)

(b) Generate the parse tree for expression F = 10 * 12 - 7 + 2, the grammar rules are given below:
List → list + digts
List → lst - digits
List → list * digits
List → digits
digits → 0/1/2/3/4/5/6/7/8/9 (5)

3. (a) With the help of an example for each, explain the linked list and bit map methods of disk space management. (6)

(b) How is CPU scheduling performed in UNIX operating system ? Explain. (4)

4. (a) How is a client server model different from the other two operating system structures ? List at least four advantages of client server model. (5)

(b) What is shell programming ? Write a shell progam to print all the contents of an existing text file in upper case. (5)

5. (a) With the help of any GUI based operating system, explain the major components of its environment. (5)

(b) What is the fleed of file protection ? Explain the access list and access group methods of file protection. (5)