Computer Configuration Questions and Answers

1. Name the components of CPU   Ans:    

• a)  ALU       
• b)  PC   
• c) Accumulator  
• d) MAR 
• e) IR    
• f) ID 
• g) MDR

2. What is the use of registers in CPU?Ans:   It is used to store intermediate data and instructions.

3.     What is the function of MAR? Ans:    It  specifies the address of  memory  location  from  which data  or instruction is to  be accessed            or to   which the data is to be stored.

4.   What is the function of MDR / MBR?Ans:     It contains the data to be written into or read from memory location addressed by MAR.

5.   What is program counter?Ans:      It keeps track of the memory address of the instruction that is to be executed next.

6.   What is the function of IR?Ans:     It contains the instruction that is being executed.

7.  What is the purpose of Instruction Decoder? Ans:     It decodes the instructions.

8. What is a data bus?Ans:      It carries a word to or from memory.

9. What is an address bus?Ans:       It  carries memory  address.  The width of  address  bus equals the number of bits in the              MAR.

10. What is the function of control bus? Ans:     It carries signals between the units of the computer. 

11. Name different I/O ports. Ans:     Port  is a socket  on the back of computer.   Different  types of  ports are serial  ports,  parallel             ports and USB ports.     

12.  What is meant by plug and play cards?   Ans:     It enables the user to add devices to computer.

13.  Expand SD RAM. Ans:      Synchronous Dynamic Random Access Memory.

14. Expand DDR RAM.  Ans:   Double Data Rate  Random Access Memory.

15.   Explain USB Port (Universal Serial Bus).Ans:  

• a. It is  a high  speed serial bus          
• b. It is a plug and play interface between computers and add on devices.

16. Give the specifications of Laser printer. Ans:    

• a. Resolution  varies from 600 to  1200 dots per inch.          
• b. Speed  varies  from  4  PPM  to  24  PPM.          
• c. Buffer size varies from 4MB to 32 MB          
• d.  Can print color images.

17. Give the specifications of dot matrix printer. Ans:  

• a. Print  head normally has 9 pins to 24 pins.         
• b. Speed  varies from  30  to  300  characters  per second.         
• c.  Buffer size varies from 1K to 64 K.

18. Give the specifications of inkjet printer. Ans:    

• a.  Resolution  is  around  300 dots  per  inch.         
• b. Speed  varies from 1PPM to 12 PPM         
• c.  Buffer size varies from 1 MB to 4 MB.

19) Write a note on computer maintenance.Ans:  

• a. Avoid heat dust and noise 
• b. Periodic updates and enhancements 
• c. Installing fire walls and anti virus. 
• d. In house software maintenance 
• e. Computer periodic checkup. Threats

20) What are the possible threats to a computer system and how to provide security?  Ans:    

• a. Privacy 
• b. Integrity  
• c.  Environmental  damage  
• d.  Human  threats  
• e. Software threats 
• f. Unauthorized access 
• g. Computer viruses Security 
•          a.  Physical protection of  machine and media. 
•          b.  Giving  passwords  and users ID 
•          c.  Using Licensed software 
•          d.  Use of Cryptography 
•          e. Use of Spike busters and UPS 

21)  Explain the typical causes of computer failures.  
Ans: 

• a. Break down of components. 
• b. Excessive dust or humidity 
• c. Virus   
• d.  Voltage  fluctuation 
• e. Corrosion 

22) Write a note on Computer virus.     Ans:    Viruses are collection of coded  instructions which  are self replicating.  When a virus attaches             itself to another file   it infects it.  They  are  normally  inactive until  infected  program is run.           
They are broadly classified  into three categories.

• a.  Boot  infectors 
• b.  System infectors 
• c. Executable program infectors