UGC NET Questions (Paper – 1)

Statement D is the only wrong statement because Internet connectivity actually increases exposure to malware instead of ensuring immunity. Statements A, B and C correctly define malware, emphasise the value of antivirus software and warn about risky attachments. No technology can make a system permanently immune to all attacks; continuous vigilance and updates are needed. Therefore the option that selects only D as wrong is the correct answer.

Option A:
Option A is incorrect because it groups A and D as wrong statements. Statement A is accurate in using malware as an umbrella term for various malicious software types. Including this correct statement among the wrong ones makes the option logically inconsistent.

Option B:
Option B is correct because it isolates D as the sole incorrect statement while accepting that A, B and C are valid security guidelines. It underlines that connecting to the Internet does not eliminate risk and that protective measures remain vital.

Option C:
Option C is incorrect because it labels C and D as wrong. C is true, as attachments from unknown senders frequently carry malware or phishing attempts. Combining one true statement with a false one produces an invalid set.

Option D:
Option D is incorrect because it treats B and D as wrong statements. Statement B is a sound recommendation about antivirus use, so grouping it with the false claim in D misrepresents good security practice.

A computer virus is designed to spread by inserting its code into host programs or documents. When an infected file runs, the virus activates, potentially damaging data or degrading performance. It may also attempt to infect additional files or systems. This behaviour of attaching and replicating is central to standard definitions of a virus.

Option A:
Protective software is the opposite of a virus; it is meant to detect and remove malicious code. Claiming that a virus always speeds up a system contradicts its harmful nature.

Option B:
A hardware device used for boosting Wi-Fi signals, such as a router or range extender, is part of the network infrastructure, not malicious code. It does not attach itself to files or replicate, so it is not a virus.

Option C:
This option correctly distinguishes viruses from other malware such as worms, which can spread independently, and trojans, which masquerade as useful programs. It captures the key idea of replication through host files.

Option D:
Desktop wallpaper images are graphical elements without self-replicating logic. They do not spread themselves or infect programs, so they are not viruses.