COMPUTER SCIENCE 2013
PART-I
FEDERAL BOARD

l. Circle the correct option. 15

• Which register stores the result of ALU operations?
  

a) Data Register                  
b) Instruction Register
c) Data Address Register  
d) Accumulator Register

• Which device can serve as both Input and Output device?
  

a) Printer                          
b) Scanner 
c) Tele Printer                       
d) Mouse

• Which of the following is a part of CPU:
  

a) ALU    
b) BIOS
c) ROM        
d) RAM

• Which of the following is NOT an Anti-Virus Software?
  

a) Thunder byte  
b) Mcafee   
c) Norton
d) AUG

• Computer memory is measured in term
  

a) Bits    
b) Bytes    
c) Baud   
d) Baud Width

• .........devices are used for communication with the computer.
  

a) CPU      
b) Output  
c) Input 
d) Input Output

• The capacity of data communication system is called
  

a) Baud Width
b) Weightage   
c) Capacity
d) Baud

• The OSI model consists of ..........layers.
  

a) Five    
b) Six      
c) Eight      
d) Seven

• Which communication media provide high quality transmission at very high speed?
  

a) Telephone lines         
b) Fiber Optics
c) Coaxial Cable          
d) Satellites

• The use of computers in education started in........
  

a) 1967 AD   
b) 1970 AD  
c) 1971 AD
d) 1972 AD

• What does a data bus carry?
  

a) Data                 
b) Data and instructions
c) Address              
d) Data and Address

• Windows is an operating environment created by
  

a) GUI     
b) Yahoo    
c) Microsoft    
d) Cisco

• In Windows to select all' you can press the keys.
  

a) Ctr1+5  
b) Ctrl+Y   
c) Ctrl+A       
d) Ctrl+C

• is the best thing the Internet has to offer.
  

a) Chat    
b) Facebook
c) Inbox        
d) E-mail

• Which of the following is NOT a Search Engine?
  

a) info Seek  
b) Facebook   
c) Excite  
d) Lros

2. Attempt any Thirteen parts. 39
The answer to each part should not exceed 5 to 6 lines.                                           

• What is IT? Write briefly.
  
• Differentiate between System Software and Application Software.
  
• Differentiate between Dot Matrix printer and DaisyWheel printer.
  
• Define Memory Cell, Memory Word and Byte.
  
• Differentiate between LAN and WAN.
  
• Write a short note on Plotter.
  
• What is Data Communication?
  
• What is meant by Simplex?
  
• Define Modulation.List three different types of modulations.
  
• Differentiate between Asynchronous and Synchronous transmissions.
  
• What is meant by Fiber Optics?
  
• Write briefly the uses of Computer Simulation.
  
• How can computer be useful in weather forecast?
  
• Differentiate between E-mail Address and URLs.
  
• What is a Computer virus?
  
• Define Word Wrap and Headers and Footers.
  
• Write a short note on the rules for file and folders names.

Attempt any Three questions. 21

3. a) Distinguish between Random Access Memory and Sequential Access Memory.
b) Write down the basic elements of a data communication system.

4. a) Define Network Topology. Explain its types.
b) Explain how computer can' be useful in business.

5. a) (i) Define the purpose of the following registers in Computer Systems:
(ii) Data Address Register (DAR)
(iii) Instruction Register OR)
b) Why is it necessary to backup data regularly?

6. a) Explain how Recycle Bin is used.
b) What is meant by file compression and how it is useful?