SAHIWAL BOARD 2014
PAPER COMPUTER SCIENCE PART-I
Time: 20 Minutes (Objective Part) Marks: 17
Note: You have four choice for each objective type question as A, B, C and D. The choice which you think is correct; fill that circle in front of that question number. Use marker or pen to fill the circles, Cutting or filling two or more circles will result in zero mark in that question.

• ALU has units.
  

(a) 2 
(b) 3
(b) 4
(d) 5

• The cells of memory are logically organized into group of:
  

(a)- 8bits
(b) 5 bits 
(c) 7 bits
(d) 6 bits

• Syntax errors are detected by:
  

(a) Compiler
(b) Linker 
(c) Loader
(d) Debugger

• A virus that replicates itself is called:
  

(a) Bug 
(b) Worm 
(c) Vaccine
(d) Bomb

• Software that is available free for a limited period of time is called:
  

(a) Freeware
(b) Shareware 
(c) Groupware
(d) Relative

• A small image that represent a program instruction file is called
  

(a) Menu 
(b) GUI 
(c) Icon 
(d) Folder

• How many types of addressing scheme?
  

(a) 3 
(b) 2
(c) 5
(d) 8

• The smallest unit of information in the computer is:
  

(a) Bit
(b) Byte 
(c) Word 
(d) Character

• Ethernet uses:
  

(a) Ring 
(b) Mesh
(c) Bus
(d) Star

• MICR stands for:
  

(a) Magic ink character reader
(b) Magnetic ink code reader
(c) Magnetic ink character recorder
(d) Magnetic ink character recognition

• How many pair of computers can simultaneously communicate on Ethernet LAN?
  

(b) 2 
(c) 3 
(d) Multiple

• Communication between computer and a keyboard is an example of:
  

(a) Simplex mode 
(b) Half duplex
(c) Full duplex
(d) Automatic duplex

• OSI reference model has layers.
  

(a) 9
(b) 8
(c) 7 
(d) 6

• Most applications of robotics are in which area?
  

(a) Cooking
(b) Manufacturing
(c) Teaching
(d) Farming

• A word processor can be used to:
  

(a) Write text
(b) Edit text
(c) Print text
(d) All

• Which of the following is not considered to be peripheral device?
  

(a) Disk drive
(b) Key board 
(c) Monitor
(d) CPU

• Which of the following memories needs to refresh:
  

(a) SRAM
(b) DRAM 
(c) ROM
(d) PROM

Time: 3:10 Hours 
(Subjective Part) 
Marks: 83

Section II

2. Attempt any EIGHT short questions. (8x2=16)

• What is operating system?
  
• Define MICR.
  
• Define plotter. 
  
• Define telecommunication.
  
• Describe De Facto standard.
  
• What is data link layer of OS1 model?
  
• Define digital signal. 
  
• What is fiber optics?
  
• Name some unbounded communication media.
  
• Define security.
  
• What is computer virus?
  
• Why is backup important?
  

3. Attempt any EIGHT short questions. (8x2=16)

• Define PROM. 
  
• What is muter board?
  
• Define High Level Language.
  
• Define Source code.
  
• What are system buses?
  
• Why is RAM called volatile?
  
• Define main memory
  
• Describe different units of CPU.
  
• What is text editor? (a) What is column?
  
• What is cell range?
  
• Define formula in Excel.
  

4. Attempt any SIX short questions. (6x2=12)

• What is computer based training? (CBT)
  
• How computers are used in stock exchange?
  
• Define E-commerce.
  
• What is robotics?
  
• List any two benefits of computer.
  
• Define multitasking. .
  
• What is primary partition?
  
• Define E-mail address.
  
• What is IP addressing?
  

SECTION-Ill: Attempt any THREE questions. (8x3=24)

5. What are impact printers? Explain all types of impact printers. 08
6. What is computer Network? Discuss different Network models, 08
7. What is encoding of data? Explain different coding schemes to represent data in computer. 08
8. What is bus interconnection? Explain different types of system buses. 08
9. Explain antivirus software with examples?
10. Write some benefits of using antivirus software. 08

SECTION-IV: Attempt any THREE questions. (5x3=25)

• Write a procedure to change date and time in Windows.05
  
• Write a procedure to insert Drop Cap for three lines. 05
  
• How a table is created in MS-Word? 05
  
• Write a procedure to merge and center cells in a worksheet.05
  
• Write a procedure to insert a column chart for the following data: 05
  
  • English: 89
    
  • Urdu: 72
    
  • Islamiat: 63
    
  • Mathematics: 95
    
  • Physics: 80
    
  • Computer Science: 82