Computer Science 9

Sahiwal Board Annual Examination 2013

Time: 2:45 Hours                                                                                              Marks: 63


Q.2. Attempt any SIX parts – [2 x 6 I 12]

(i) What is difference engine?

(ii) Write any two characteristics of third generation of computer

(iii) What is meant by computer program?

(iv) What is the use of laptop computer? (v) What are computer ports?

(vi) What is the use of Data Bus?

(vii) Write the name of five important -keys of keyboard.

(viii) What is the use of Trackball? (ix) Define the voice recognition software.

Q.3. Attempt any FIVE parts p [2 x 5 = 10]

(i) Convert the following binary number 00110011into Octal.

(ii) Convert the decimal number 129 into binary.

(iii) What is Unicode? (iv) What is method of 2’s complement? Describe it with example.

(v) How do you launch the command processor under Windows XP?

(vi) What is the use of Recycle bin? (vii) Define Operating system.

(viii) What is start button and task bar?

Q.4. Attempt any FIVE parts [2 x 5 = 10]

(i) What is main memory?

(ii) Differentiate between RAM and ROM (iii) How is data organized on magnetic disk?

(iv) What is Boolean algebra? (v) Differentiate between OR and AND operator.

(vi) Make truth table of X.Y (vii) Define Software

(viii) Differentiate between RD and CD


Note: – Attempt any Three Questions [1 x a = 211

Q.5 (a) What do you know about 4 generation. [3]

(b) Compare data and address bus

Q.6 (a) What is Voice recognition system? Explain.

(b) What is formatting? Describe different types of formatting. . [3]

Q.7 (a) Solve using 1’s complement method 25-12

Q.8 (a) What are Boolean constants? [2]

(b) Represent the function f(x,y)= + x.)7 by using truth table.

Q.9 (a) Write a note on language translator [4]

(b)Write a note on features of Windows [3]

Practical PART-Ill

Note: – Attempt any one Question [5 x 2=1o]

Q.10 (a) Write down steps how would load Windows Explorer [5]

(b) How we can get help from windows? Write down steps. . [5]

Q.11 (a) Write down the steps to change time in system D [5]

(b) Write down the steps to rename folder [5]

Q.12 a) Write down steps restore and close windows [5]

b) Write down steps to launch start menu.