Federal Board | Past Papers | Notes | A-Level

Back to: Computer Science Class-9 Notes

(a) Write any three activities/effects of a computer virus.
(b) Write steps to avoid viruses from computer.

(a) Harmful effects of computer virus:

• Computer virus can slow down your computer. It might make some programs faulty or corrupt.
• Might damage your boot sector creating problems when you boot into the windows.
• Might steal important information from your computer and send to some other person.

(b) Steps to Avoid Viruses From Computer:

• The latest anti-virus should be installed on the computer.
• Junk or unknown emails should not be opened.
• Unauthorized or pirated should not be installed on the computer.
• An important way of protection against virus is the use of backup of data. The backup is used if the virus deletes data or modifies it.
• Freeware and shareware software from the internet normally contain viruses. It is important to check the software before using them.