Computer & Information Technology

443

Q200. How many secret keys are ordinarily shared for both encryption and decryption in symmetric cryptography?

[SSC CHSL Tier-II, 18 November 2024]

1. Two
2. One
3. None
4. Three

Answer: B. One

Explanation: Symmetric cryptography uses the same secret key, or equivalent shared secret, on both ends of communication. It is generally efficient for bulk encryption. The main practical challenge is distributing and protecting the key securely between sender and receiver.

Q199. An online retail marketplace selling products directly to consumers best illustrates which e-commerce category?

[SSC CHSL Tier-II, 18 November 2024]

1. B2C
2. B2B
3. C2B
4. C2C

Answer: A. B2C

Explanation: Business-to-consumer commerce covers transactions where a business sells goods or services to individual end users. It differs from B2B transactions between firms, C2C exchanges between consumers and C2B arrangements where individuals supply value or services to businesses.

Q198. What does the abbreviation WWW represent?

[MPPSC Assistant Professor 2022 recruitment (held 17 November 2024), GS Paper II]

1. World Wide Web
2. Wide World Web
3. World Web Wide
4. Web World Wide

Answer: A. World Wide Web

Explanation: The World Wide Web is a system of linked resources accessed with browsers over the internet. Tim Berners-Lee developed its foundational technologies, including HTML, HTTP and URLs. The web is one major service carried by the broader internet infrastructure.

Q197. Which technology uses a decentralised ledger of linked records, notably in cryptocurrencies?

[MPPSC Assistant Professor 2022 recruitment (held 17 November 2024), GS Paper II]

1. Artificial intelligence
2. Cloud computing
3. Blockchain
4. Internet of Things

Answer: C. Blockchain

Explanation: Blockchain links transaction records into blocks secured using cryptographic techniques and distributed agreement mechanisms. Cryptocurrency systems such as Bitcoin use this architecture to maintain a shared record without relying on a single central bookkeeper. It differs from AI and cloud computing.

Q196. In a default new Microsoft Word 2016 document, what is the usual body-text font size?

[SSC CHSL, 8 July 2024, Shift 2]

1. 12 points
2. 14 points
3. 10 points
4. 11 points

Answer: D. 11 points

Explanation: Word 2016 normally creates blank documents using the Calibri 11-point Normal style, although templates and user settings may change that choice. Font size is expressed in points, where one point is one seventy-second of an inch in standard typography.

Q195. Which of these is system software?

[SSC CHSL, 8 July 2024, Shift 1]

1. Adobe Photoshop
2. Microsoft Windows
3. Google Chrome
4. Microsoft Word

Answer: B. Microsoft Windows

Explanation: Microsoft Windows is an operating system and therefore system software. It coordinates hardware resources, files and running programs. Photoshop, Chrome and Word are applications intended for particular user tasks and depend on an operating system to run.

Q194. Which keyboard combination inserts a new slide in Microsoft PowerPoint?

[SSC CHSL, 2 July 2024, Shift 4]

1. Ctrl + N
2. Ctrl + D
3. Ctrl + M
4. Ctrl + I

Answer: C. Ctrl + M

Explanation: Ctrl + M creates a new slide in the current PowerPoint presentation. Ctrl + N ordinarily starts a new presentation, whereas Ctrl + D duplicates a selected object or slide in appropriate contexts. Shortcut meanings depend on the active application.

Q193. What is another name for symmetric-key encryption?

[SSC CHSL, 1 July 2024, Shift 4]

1. Public-key encryption
2. Asymmetric encryption
3. Conventional encryption
4. Hybrid encryption

Answer: C. Conventional encryption

Explanation: Conventional encryption is a traditional name for symmetric or secret-key cryptography. The two parties rely on a shared secret instead of a public-private key pair. Algorithms such as AES belong to this family and are widely used for protecting data.

Q192. Which term describes an interoperable network of shared three-dimensional virtual worlds with digital-property rights?

[UPSC CSE Prelims 2024]

1. Big data analytics
2. Cryptography
3. Metaverse
4. Virtual matrix

Answer: C. Metaverse

Explanation: The metaverse is the concept of interconnected persistent digital spaces in which people interact through avatars and may possess virtual objects. Big-data analytics studies datasets, while cryptography protects information. Neither term specifically denotes interconnected immersive worlds and digital ownership.

Q191. The term qubit, a fundamental two-level information unit, belongs to which field?

[UPSC CDS-I 2024 (General Knowledge)]

1. Classical computing
2. Classical cryptography
3. Quantum computing
4. Laser physics

Answer: C. Quantum computing

Explanation: A quantum bit or qubit is the basic unit of quantum information. Unlike a classical bit fixed at zero or one, a qubit can exist in superpositions until measurement. Quantum processors use controlled qubit operations to perform certain kinds of computation.