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4.  List any three signs that indicate that the computer is infected with a virus.
                  Ans.  Following are the three signs that indicate that a computer is infected with a virus:
                       ●  Computer runs very slow as it loses its processing speed.
                       ●  There will be a change in the system file size.
                       ●  An unusual increase in number of files.
                    5.  Can computer viruses infect hardware?                                             [CBSE Handbook]
                  Ans.  Computer virus is a malicious code that cannot damage the physical components of the computer directly.
                    6.  What is the use of antivirus software? Name any two commonly used anti-virus software.   [CBSE Handbook]
                  Ans.   Antivirus software is a program designed to prevent, detect and remove malicious programs from the computer. After
                       you install the antivirus software runs automatically in the background to provide real-time protection against virus
                       attacks. Some examples of anti-virus software are McAfee Virus Scan, Norton Anti-Virus, Microsoft Security essentials,
                       Quick Heal, etc.
                    7.  How are temporary files created on the computer?
                  Ans.   Temporary files are created temporarily by programs that store information related to the file you are working on
                       in your computer. It increases the efficiency of  the software and also helps in recovering the data at the time of
                       unexpected closing of the file due to power failure or system shut down.
                 B.  Long answer type questions.

                    1.  List a few important functions performed by an operating system.
                  Ans.  Following are some important functions performed by an operating system:
                       ●  It works as an interface between the user and the machine.
                       ●   It works as a device manager. It keeps a track that all the devices are functioning properly and are available to the
                          user whenever needed.
                       ●  It manages the software of the computer.
                       ●   It manages the computer memory and keeps track of the memory in use and free so that it is available to the user
                          whenever needed.
                    2.  What are navigation keys?
                  Ans.   These keys allow you to move the cursor or navigate through text and documents. They are essential for editing,
                       selecting, and moving within different software applications. Arrow Keys (Up, Down, Left, Right) allow you to move the
                       cursor or highlight text in the corresponding direction. The Home key moves the cursor to the beginning of a line of
                       text or to the start of a document. The End key moves the cursor to the end of a line of text or to the end of a document.
                       The Page Up key scrolls up one page at a time in a document or on a web page. The Page Down key scrolls down one
                       page at a time in a document or on a web page.
                    3.  What is a file in computers? Give examples.
                  Ans.   Any data in the computer is stored in the form of a file. That is why a file is said to be a collection of logically related
                       data. Every file has its own unique name which is made up of two parts separated by a period File name (A filename
                       can consist of letters, numbers, spaces, and characters) and extension that identifies the file type.
                       For example:
                       Project.doc      is a Word file.
                       Project.ppt      is a PowerPoint.
                       Project.xls      is a Spreadsheet.
                    4.  What precautions will you take to protect your computer from computer viruses?
                  Ans.   You can protect your computer from virus by following the given precautions:
                       ●   Install and use anti-virus software.
                       ●   Keep anti-virus software updated so that it can scan and remove new viruses.
                       ●   Scan all the files that you download from the Internet.
                       ●   Do not open e-mails from an unknown person/sender.
                       ●   Don’t allow any untrustworthy person to use your system.
                       ●   Never use unknown pen drive/CD on your computer.
                       ●   Never click on the unknown windows that pop-up when you are surfing the Internet.

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