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CLASS- VII, SUBJECT- COMPUTER, CHAPTER-08, COMPUTER VIRUS, EXERCISES, A. Tick [  ] the correct options:, 1] Which program damages the computer?, a] Virus, [  ] b] Antivirus, [ ] c] Microsoft Word [ ], 2] Virus is:, a] friendly [ ] b] harmful, [  ] c] good, [ ], 3] Which is/are types of virus(es)?, a] Worm [ ] b] Trojan Horse [ ] c] a) & b) both, [], 4] Who can protect the computer from virus?, a] Humans [ ] b] Antivirus, [  ] c] Virus, [ ], B. Write the complete tag for the following:, 1. Virus destroy all the data and even completely damage the hard disk., 2. The boot strap loader is a small program that is the first part of the, operating system that the computer loads., 3. Polymorphic viruses encrypt or encode themselves in a different way, every time they infect a system., 4. Multipartite viruses spread in multiple ways possible., 5. Antivirus is a security program we install on our computer to protect it, from getting infected by malware., C. Answer the following questions:, 1. What is a virus? How it may harm our computer?, Ans. A computer virus is a program designed to harm or cause harm to a, computer. Virus destroys all the data or even completely damages the hard, disk., It spreads through e-mail attachments, portable devices, websites, containing malicious scripts and file downloads., 2. Name the various types of virus. Explain them also., Ans. The various types of virus are:, a] Trojan Horse: Trojan Horse can illegally trace important t login

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b], , c], d], , e], 3., Ans., 4., Ans., , 5., Ans., , 6., Ans., , details of users online. For example- e-banking is very common among, users., Macro Virus:, These virus infect the files created using some, applications or programs that contain macros such as doc, pps, xls and, ndb., Polymorphic Virus: Polymorphic viruses encrypt or encode, themselves in a different way every time they infect a system., Multipartite Virus:, These viruses spread in multiple ways. It is a fast,, moving virus that use file infectors or boot infectors to attack the boot, sector., Worms: A worm is a program very similar to a virus, it has the ability, to self-replicate and can lead to negative effects on our system., What do you mean by malware?, The term malware is a catch-all phrase for any type of malicious, software, such as viruses, worms, Trojans and spyware., Write the steps to scan a file with an antivirus., There are following steps to scan a file with an antivirus:, a] Open the folder which contains the file. Right-click on the file., b] Click on Quick Heal Antivirus Pro Scan. The scanning will start., c], After scanning, the message will be displayed whether the file is, infected or not., Write a short note on virus evolution., 26 years ago, the first computer virus was created. In January of 1986,, Brain was the first PC virus discovered. Due to the lack of connectivity, between computer systems, viruses were transferred via floppy disks, and only jumped from one PC to another if you physically moved the, virus., What is an antivirus? Name any four antivirus., Antivirus is a security program we install on our computer to, protect it from getting infected by malware., Four antivirus are:, i], Norton, ii] Kaspersky Anti-virus, iii] Quick Heal Antivirus Pro, iv] Avast Pro Antivirus