Test Papers / Previous Question Papers of IGNOU CS02 Introduction to Software June 2006

PGDCA / MCA (I Yr) / BCA
Term-End Examination

CS02 : Introduction to Software

Time: 2 hours
Maximum Marks: 60

June 2006

PART A

1. (a) Write an algorithm and draw a flow chart to calculate the factorial of a given number. (6)

(b) What is a process ? Explain the various process states with the help of a state diagram. Why is a PCB required, and what is the information that a PCB contains? (8)

(c) Write a shell program to convert an integer to its binary equivalent. (6)

(d) How is a client-server model different from the stand-alonem odel ? Explain this with the help of a suitable example of each. (5)

(e) Explain the various phases of systems investigation, with the help of a suitable example (5)

2. (a) Construct context free grammar for the following 'C' statements :
(i) Do .. While
(ii) increment operator

(b) What is a project control system ? With the help of an example of each, explain the Gantt chart and the PERT chart scheduling techniques.

3. (a) Explain the CPU scheduling and memory management in a UNIX operating system. (5)

(b) Five jobs arrive in a system in the order given below : (5)

Process CPU time Priority
P 1 1 0 3
P 2 6 5
P 3 b 2
P 4 4 1
P 5 8 4

5 is given the highest priority. Calculate the tumarounda nd waitingt ime for each process for the following scheduling algorithms:
(i) Shortest Job First
(ii) Round Robin (quantum 2)

4. (a) What are the main advantages of distributed OS? How are the file system and protection supported in distributed OS?

(b) Write UNIX commands for the following :
(i) To print how many users are working on the system.
(ii) To run a process in the background.
(iii) To print the file names and their file sizes in the current directory.
(iv) To print a long listing of the directory.
(v) To print content of the "passwd" file.

5. (a) List the major activities performed in the development of a software product. Also mention the limitations of the development cycle.

(b) What is the significance of thrashing? Write down the steps performed in demand paging.