Causes of Computer Virus

A computer virus is a type of malicious software, or malware, that infects computers and corrupts their data and software. Worm, ILOVEYOU, SQL Slammer, Stuxnet, are some examples of computer viruses. The computer virus is created deliberately, i.e. (intentionally), we create it when required.

The following are the main causes of a Computer Virus.

1. Infected Flash Drives or Disks: Flash drives and disks are a big cause of spreading viruses. Flash drives and disks are used to transfer data from one computer to other. A virus can also be copied from one computer to other when the user copies infected files using flash drives and disks.

2. Email Attachments: Most of the viruses spread through emails. Email attachment is a file that is sent along with an email, An email may contain an infected file attachment. Virus can spread if the users open and download such email attachment. It may harm the computer when it is activated. It may destroy files on the hard disk or may send the virus automatically to all email addresses saved in the address book.

3. Bluetooth: Even less common than removable storage, a virus can also come from Bluetooth transfers. You can unknowingly have a virus transferred to your computer through a Bluetooth transfer. Again, the answer is to use anti-virus software to check all files gained through file transfer.

4. Infected Websites: Thousands of insecure websites can infect computer with viruses. These websites are developed to spread viruses or other unethical material. The virus is transferred to the user's computer when this material is downloaded. These websites may access the computer automatically when the Users visit them.

In the Question:

Which of the following Statement is Incorrect?

(i) A computer virus is a type of malicious software.

(ii) Worm, ILOVEYOU, SQL Slammer, Stuxnet, are not examples of computer viruses.

(iii) Thousands of insecure websites cannot infect computer with viruses.

The Answer is Both ii and iii.

Hence the Option B is Correct.

Causes of Computer Virus

A computer virus is a type of malicious software, or malware, that infects computers and corrupts their data and software. Worm, ILOVEYOU, SQL Slammer, Stuxnet, are some examples of computer viruses. The computer virus is created deliberately, i.e. (intentionally), we create it when required.

The following are the main causes of a Computer Virus.

1. Infected Flash Drives or Disks:

Flash drives and disks are a big cause of spreading viruses. Flash drives and disks are used to transfer data from one computer to other. A virus can also be copied from one computer to other when the user copies infected files using flash drives and disks.

2. Email Attachments:

Most of the viruses spread through emails. Email attachment is a file that is sent along with an email, An email may contain an infected file attachment. Virus can spread if the users open and download such email attachment. It may harm the computer when it is activated. It may destroy files on the hard disk or may send the virus automatically to all email addresses saved in the address book.

3. Bluetooth:

Even less common than removable storage, a virus can also come from Bluetooth transfers. You can unknowingly have a virus transferred to your computer through a Bluetooth transfer. Again, the answer is to use anti-virus software to check all files gained through file transfer.

4. Infected Websites:

Thousands of insecure websites can infect computer with viruses. These websites are developed to spread viruses or other unethical material. The virus is transferred to the user's computer when this material is downloaded. These websites may access the computer automatically when the Users visit them.

5.  Networks:

Virus can spread an infected computer is connected to a network. The internet is an example of such network. When a user downloads a file infected with virus from the internet, the virus is copied to the computer. It may infect the files stored on the computer.

6. Pirated Software:

An illegal copy of software is called pirated software. Virus can spread if user installs pirated software that contains a virus. A variety of pirated software is available in CDs and from the internet. Some companies intentionally add virus in the software. The virus is automatically activated if the user uses the software without purchasing license.

In the Question:

Which of the following are the main causes of Computer Virus?

The Answer is All of the above.

Hence the Option D is Correct.