Malware: Introduction MCQs Quiz | Class 9
This is an online MCQ quiz for Class 9 Computer Applications (Code 165), from Unit 2: Cyber Safety. This quiz covers the topic of ‘Malware: Introduction’, focusing on what malware is and its common impacts. Attempt all questions and click ‘Submit Quiz’ to see your score and download the answer PDF.
About Malware: Introduction
Malware, short for “malicious software,” is any software intentionally designed to cause disruption to a computer, server, client, or computer network, leak private information, gain unauthorized access to information or systems, deprive users access to information or which unknowingly interferes with the user’s computer security and privacy. This section provides a foundational understanding of what malware is and the common problems it can cause.
What is Malware?
Malware is a catch-all term for any type of software written with malicious intent. It can infect your devices in many ways, such as through email attachments, malicious downloads, or infected USB drives. Once on a system, it can perform a variety of harmful tasks. Understanding the different types is key to recognizing threats.
Common Types of Malware:
- Virus: A program that attaches itself to another program and replicates, spreading from one computer to another, leaving infections as it travels.
- Worm: Similar to a virus, a worm can self-replicate. However, it does not need to attach to a program to spread. It can travel across networks on its own.
- Trojan Horse: A program that disguises itself as something useful or harmless to trick users into installing it. Once installed, it can create a backdoor for attackers to access the system.
- Ransomware: A type of malware that encrypts a user’s files. The attacker then demands a ransom (payment) from the victim to restore access to the data upon payment.
- Spyware: Software that secretly monitors the user’s computer activity, collecting information like keystrokes, web browsing history, and login credentials.
- Adware: Software designed to display unwanted advertisements on your computer, often in the form of pop-ups. While not always malicious, it can be intrusive and slow down your system.
Common Impacts of Malware
A malware infection can have a wide range of negative consequences for individuals and organizations. The impact can vary from minor annoyance to severe financial or data loss.
Key Impacts:
| Impact Area | Description of Impact |
|---|---|
| Data Theft | Malware can steal sensitive personal and financial information, such as passwords, bank account details, and credit card numbers. |
| System Damage | It can corrupt files, delete data, or even render the entire operating system unusable, requiring a complete re-installation. |
| Performance Degradation | Infected computers often run very slowly, freeze, or crash unexpectedly as the malware consumes system resources. |
| Financial Loss | This can occur directly through ransomware demands or indirectly through the theft of banking credentials. |
| Unauthorized Access | Attackers can use malware to gain remote control over a victim’s computer, using it for illegal activities or to launch attacks on others. |
Quick Revision Points
- Malware stands for Malicious Software.
- Its primary goal is to harm, disrupt, or exploit computer systems.
- Common types include viruses, worms, Trojans, and ransomware.
- Infections can lead to data theft, slow performance, and financial loss.
- Being cautious about downloads, emails, and removable media can help prevent infections.
Practice Questions
1. What is the main difference between a virus and a worm?
A virus needs a host program to spread, while a worm can spread on its own across networks.
2. If you receive an email with a surprise attachment from an unknown sender, what should you do?
You should delete the email without opening the attachment to avoid a potential malware infection.
3. Which type of malware is designed to block access to a computer system until a sum of money is paid?
Ransomware.
4. How does a Trojan Horse typically infect a computer?
It tricks the user into installing it by appearing to be a legitimate and useful piece of software.
5. What is a common sign that your computer might be infected with adware?
An increase in pop-up ads, even when not browsing the internet.
