MCQ
Basic Computer: Security & Viruses MCQ - Practice Questions with Answers
Solve 15 Basic Computer: Security & Viruses questions for RAS/RPSC preparation.
Practice questions
Q1Assertion (A): Enabling multi-factor authentication makes an online account safer than using only a password. Reason (R): It requires an additional verification factor, such as a one-time code, even if the password is known. Choose the correct answer.
The assertion is true because a password alone can be guessed, leaked or stolen through phishing. Multi-factor authentication adds another check, such as a one-time code, authenticator app approval or biometric verification. The reason is also true and it explains why the account becomes safer: knowing the password is no longer sufficient for login. This does not make the account impossible to attack, but it reduces the chance of unauthorised access compared with password-only protection.
Q2You receive an email claiming to be from your bank. It asks you to click a link and enter your password to avoid account closure. Which safe practice should you follow first?
This is a phishing situation: the email creates urgency and asks for a password through a link. The first safe step is to inspect the exact address and domain, or separately open the bank's known website. A secure-looking page is not enough, because fake pages can copy logos and colours. Banks do not ask users to send passwords by email. Antivirus may help, but it cannot replace careful checking of the URL and sender.
Q3Assertion (A): Keeping regular backups can help a user recover data after a ransomware attack. Reason (R): Ransomware may encrypt the user's files and demand payment for restoring access.
Ransomware is malicious software that can encrypt or lock a user's files and then demand payment for access. This makes the Reason true. Regular backups are useful because they provide a separate copy of important data. If the original files become encrypted, deleted or unusable, the user can restore data from a clean backup instead of depending only on the attacker. Therefore the Assertion is also true, and the Reason correctly explains why backups reduce the damage caused by ransomware.
Q4Which of the following is an incorrect password-safety practice?
The stem asks for the incorrect practice, so the right answer is the unsafe behaviour. A strong password should be long and should normally mix letters, numbers and symbols. It should not be reused across important accounts, because one leaked password can then open email, banking and social media together. Changing a suspected compromised password and not sharing passwords over chat or email are both safe habits. Hence option B is the incorrect password-safety practice.
Q5Match the malware type in List I with its usual behaviour in List II. List I: I. Virus II. Worm III. Trojan horse IV. Ransomware List II: 1. Locks or encrypts files and demands payment 2. Spreads by attaching itself to files or programs 3. Disguises itself as a useful program 4. Self-replicates across networks without needing to attach to a host file
A virus commonly spreads by attaching itself to a file or program, so I matches 2. A worm can copy itself across a network without needing to attach to a host file, so II matches 4. A Trojan horse pretends to be useful or harmless software, so III matches 3. Ransomware locks or encrypts files and demands payment, so IV matches 1. Therefore the correct matching is I-2, II-4, III-3 and IV-1.
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More questions
6Which statement best describes a computer virus?
7Assertion (A): In a browser, HTTPS and a padlock icon generally indicate that communication with the website is encrypted. Reason (R): HTTPS guarantees that every website using it is genuine and completely safe from fraud.
8Match List I with List II. List I: I. Virus II. Worm III. Trojan horse IV. Spyware List II: 1. Malicious programme that disguises itself as useful software 2. Malware that secretly collects user information 3. Malware that attaches to a host file or programme 4. Malware that can spread across networks without attaching to a host file
9Consider the following statements about safe computer use. Statement 1: Important files should be backed up regularly. Statement 2: Operating system and application updates can fix security weaknesses. Statement 3: A firewall removes all existing viruses from the computer. Which of the above statements are correct?
10Match List I with List II. List I: I. Antivirus II. Firewall III. Backup IV. Spam List II: 1. Unwanted bulk email messages 2. Copy of data kept for recovery 3. Software used to detect and remove malicious programmes 4. Security system that filters network traffic
11Which of the following is an incorrect practice for creating and using passwords safely?
12Which of the following statements about antivirus software is incorrect?
13Which practice is most useful for keeping antivirus software effective against newly discovered viruses?
14A user receives an email that looks like it is from a bank and asks them to click a link and enter the ATM PIN immediately. Which safe practice should the user follow first?
15An email says that your bank account will be blocked unless you immediately click a link and enter your password. Which type of cyber threat is this most likely to be?