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Solutions for Computer Applications, Class 9, CBSE
What makes a secure password ?
A secure password should be one that you will easily remember and be a mixture of upper-case and lower-case letters, numbers and characters
Reason — A password that is a mixture of upper-case and lower-case letters, numbers and characters becomes difficult to guess or crack.
What is the purpose of anti-virus software?
To prevent a virus from attacking the network
Reason — Anti-virus software protects the computer from viruses.
Which of the following are types of malicious software?
Viruses, worms, adware, trojans and spyware
Reason — Malware is a general term used to refer to viruses, worms, spyware, adware etc. Malware infects our computer, making it behave in a way, which we do not approve of.
How do you know if a website is secure?
The prefix of the website is https
Reason — A safe site's URL starts with https://
and it means that the website is secure.
When accessing a website, which icon can be seen in the address bar to indicate that the website is secure ?
padlock
Reason — A padlock icon can be seen in the address bar to indicate that the website is secure.
What is the purpose of a firewall ?
To prevent unauthorised connections coming in to and out of a network
Reason — Firewall is a program that monitors all communications and traps all illicit packets. It helps to prevent unauthorised connections coming in to and out of a network.
What is cyber safety ? Why is it important ?
Cyber Safety refers to the safe and responsible use of Internet so as to ensure safety and security of personal information and not posing threat to anyone else's information.
Although Internet has made things easier but at the same time it has posed many security risks too, if not used in a proper way. Thus, it is important to know about possible threats, challenges and risks of working on Internet to ensure personal safety and information security. Hence, cyber safety becomes very important to know and prevent possible threats to personal safety online.
What should you do to protect your identity on Internet ?
We can protect our identity on the Internet by using the following solutions:
How do websites track you online ?
Various types of information used by websites to track us online are as follows:
What are cookies ? How are they used by websites to track you ?
Cookies are small text files on our computer storing small pieces of information related to our online habits.
Cookies are of two types:
What is Private browsing ? Why is it considered a better way of browsing the Internet?
A type of browsing wherein browser opens in incognito mode or through proxy or VPN, and does not store cookies about our online activity, is called Private browsing.
It is considered a better way of browsing the Internet as it allows the user to use the Internet without revealing his/her search history and sharing data.
Why are passwords considered an important safety tool?
Passwords are considered an important safety tool as a password helps to :
What should you keep in mind while choosing an effective password?
We should keep the following things in mind while choosing an effective password:
What is confidentiality of information ? How do you ensure it ?
Confidentiality of information ensures that only authorized users get access to sensitive and protected data.
To ensure confidentiality of information, we must follow the following best practices:
What is a computer virus ? How can it affect your computer ?
A computer virus is a computer program that can infect other computer programs by modifying them in such a way as to include a copy of itself.
Viruses can alter, corrupt and delete files, freeze the computer, flash unknown or unasked messages or display unwanted graphics on the computer screen, play unwanted music and interfere with the computer operation.
Why are antivirus software considered important ?
An antivirus software is considered important because it scans our disk for viruses and removes them, if any virus is found. Moreover, some antivirus software remains present in memory all the time so that they can detect the viruses and counterattack them.
What type of damages can be caused by viruses to your computer?
A virus can damage our computer in the following ways:
What are Malware ? What type of damages can they cause to your computer ?
Malware is a general term used to refer to viruses, worms, spyware, adware etc. It is unwanted software that someone else wants to run on our computer. Malware infects our computer, making it behave in a way, which we do not approve of.
Malware can damage our computer in the following ways:
What is the significance of a firewall in a computer's security scheme ?
A firewall secures the computer such that only authentic users can connect to it. The significance of firewall lies in its ability to monitor, filter, and control incoming and outgoing network traffic based on predefined security rules. This helps prevent unauthorized access, data breaches, and malicious attacks, such as viruses, malware, and hacking attempts, from reaching the protected computer system.
What is cyber crime ? How can you report it ?
Any criminal offence that is facilitated by, or involves the use of, electronic communications or information systems, including any electronic device, computer, or the Internet is referred to as Cyber crime.
A cyber crime can be reported in the following ways:
What is cyber bullying and cyber stalking ?
Harassing, demeaning, embarrassing, defaming or intimidating someone using modern technologies like Internet, cell phones, instant messengers, social networks etc., is called Cyber Bullying.
Cyber stalking refers to online stalking where someone uses Internet, chat rooms, social networking sites, emails etc. to stalk his/her victim. Cyber stalker follows the victim online everywhere and keeps posting/sending something which are unsolicited.
What name is given to a malicious program that comes in disguise of a useful program ?
Trojan Horse
Reason — A trojan horse is a program that appears harmless, such as a text editor or a utility program, but actually performs malicious functions such as deleting or damaging files.
Which of these is classed as personal information ?
Date of birth, Online nickname, Gender
Reason — 'Date of birth', 'Online nickname' and 'Gender' is personal information. 'Largest peak in your continent' is a public information.
What software can you use to avoid getting viruses ?
Anti-virus software
Reason — Anti-virus software protects the computer from viruses.
What is a computer virus ?
a program written to cause harm to a computer
Reason — Computer viruses are malicious codes/programs that cause damage to data and files on a system.
What is the most common way people's computers get infected by a virus ?
Run/open an infected disk
Reason — The most common way computers get infected by a virus is by running or opening an infected disk or file.
What purpose does anti-virus software serve ?
it inspects computer files and email attachments for viruses and removes or quarantines any that it finds
Reason — An anti-virus software inspects computer files and email attachments for viruses and removes or quarantines any that it finds.
Which of the following is NOT an example of Cybercrime ?
Stealing computer hardware
Reason — Stealing computer hardware does not involve the use of electronic communication or information systems. Thus, it is not a cyber crime.
What does a firewall do ?
prevents unauthorised access to your computer via the Internet
Reason — Firewall is a program that monitors all communications and traps all illicit packets. Thus, it prevents unauthorised access to your computer via the Internet.