Std 7 - Chapter - 5 Computer Virus

Chapter - 5

Computer Virus

1.	What are the symptoms of a computer virus?
	Symptoms of a virus include computer lockups, screen distortions, data loss, and unusual messages and reduced computer performance.
2.	What is an antivirus program?
	Antivirus programs check the files on your computer for viruses and also remove the entire virus.
3.	What is the full form of VIRUS?
	Vital Information Resources Under Seize
4.	What is a computer virus?
	Computer viruses are small software programs that are designed to spread from one computer to another and to interfere with computer operation.
5.	Write the names of any three Antivirus software
	Norton Antivirus, Kaspersky, and McAfee
6.	What is a Boot sector virus?
	Boot sector viruses affect the boot sector area of a hard disk.
7.	Write short notes on: Worms, Trojans
	Worms: A worm is a malicious program that duplicates itself. They eventually fill up the disks space with copies of itself and thereby make a computer system to work very slowly. Trojans: These viruses at first appear to be friendly but are very malicious programs.  They steal information from the computer.
8.	Why it is necessary to scan an external device attached to your computer, before using it?  Describe the process of scanning it.
	Because external devices may contain viruses, that affects our computers. Step 1. Double Click the Kaspersky Anti-Virus. Step 2. Click Scan option Step 3: Click the Full Scan option to scan all the drives of your computer.
9.	What precautions should you take to protect your computer from a virus?
	·         Do not use a CD or pen drive received from another person unless you are certain that the disk does not contain a virus. ·         Do not download programs or other information from non-reputed sources on the Internet. ·         Restrict access to your system. ·         Install Antivirus programs on your computer.
10.	Why is it necessary to update your Anti-Virus software?
	New viruses appear often.  You must keep updating your antivirus software regularly to fight against these new viruses.
11.	What are ‘bombs’ in connection with virus?
	Bombs are viruses which activate themselves after a specific time period and cause damage to the computer system.
12.	What do you mean by a macro virus?
	Macro viruses are written in the scripting languages for Microsoft programs such as MS Word and MS Excel.  These viruses spread by Excel spreadsheets and other Microsoft Office documents.
13.	How do computer viruses attack our computers?
	·         Through an infected CD or Pen drives. ·         Through e-mail attachments. ·         Visiting malicious website and downloading infected files. ·         Starting an infected application as it infects other running applications.