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Chapter 8(Computer viruses), D Q1 What is a computer virus?, A1 Virus is a program which is able to replicate itself and is harmful for the computer., Viruses can cause harm to the software and sometimes to the hardware also. For example, it, may erase data or corrupt the programs on the computer., Q2 What are do’s and don’ts of computer virus?, A2 Do’s of a computer Virus:- (a)The files that are saved on CDROM are not infected by, viruses., (b) The output devices or the hardware of the computer does not generally get infected, by the virus., Don’ts of computer Virus :- (a) The files that are attached to an email or copied to or from, the disks or removal devices are infected by the virus, they may spread from one computer to, another., (b) Operating system, processor are first to get attacked by the virus., ( c) Virus attaches itself to the files in the hard disk and infect the computer., Q3 How can computer virus be prevented?, A3 (a) For blocking the unwanted material from internet install a free firewall program., (b) The online/offline access to system should be restricted, (c) Do not allow every one to use your system., (d) Avoid using any unknown disk in the computer., (e) The antivirus software should be installed and updated regularly., (f) The files which are downloaded from the internet should always be scanned., Q4 What is computer worm?, A4 This type of virus spread from one computer to another by reproducing itself. It is different from, other viruses. This virus spread without the actions of the humans., Q5 How can spam be avoided? Give any three ways., , A5 The unwanted or the unsolicited email is known as spam. It is medium of spreading virus, or worms. Three ways through which spam can be avoided, (1) Be careful of sharing your email address with anyone., (2) Delete the spam mails without reading them., (3) Do not reply to spam mails or messages.