Solved Revision L-7 / Class 5th Computer

 

Class : 5^th

Subject : Computer

Revision : (Topic L-7 Know about virus )

A) Fill in the blanks                                                                              ( 1  X 4 = 4)

1)   Stealth Virus has ability to hide itself from some antivirus

software programs.

2)   Friday the 13th is a logic bombs virus.

3)   Nimda and SQL slammer are example of network virus

4)   Some common antivirus software are Quick Heal and AVG

B) Write T for “True” and F for “False” :-                                   (2X1=2)

1)   Worm is the name of Antivirus.                                    FALSE

2)   Computer viruses cannot spread through air                 TRUE

C) Answer the following                                                                    (2X2=4)

1)   What do you mean by Virus?

Ans: A computer virus is a program which infects the computer and disturbs its normal working. Computer viruses can attach  themselves to other programs, files or data stored in the system automatically without any desire or information.

2)   What is the use of antivirus programs?

Ans: Antivirus software is utility software which is used to identify and remove computer virus. These are memory resident programs that get activated when system is started.