Technology – Medium Level – GK Questions

Q: Which technology enables simultaneous voice and high-speed data on 4G networks?

VoLTE – VoLTE (Voice over LTE) transmits voice as IP packets over 4G data network, enabling simultaneous voice calls and high-speed internet without dropping to 3G/2G. Provides HD voice quality, faster call setup, and improved battery life. Requires compatible device, SIM, and network support.

Q: Unicode can represent characters from virtually all writing systems in the world.

True – Unicode is a universal character encoding standard supporting over 149,000 characters from 161 scripts, plus symbols, emojis, and historical scripts. Replaces legacy encodings (ASCII, ISO-8859) that supported limited languages. UTF-8 is the dominant Unicode encoding on the web and modern systems.

Q: Which protocol ensures data integrity and authenticity in digital communications?

Digital Signature – Digital Signatures use public-key cryptography to verify message integrity (not altered) and authenticity (sender identity). Based on hashing and asymmetric encryption. Used in software distribution, financial transactions, legal documents. Distinct from digital certificates which bind public keys to identities.

Q: Which payment method uses biometric authentication linked to Aadhaar for transactions?

AePS – AePS (Aadhaar Enabled Payment System) uses Aadhaar number and biometric authentication (fingerprint/iris) for cash withdrawal, deposit, balance inquiry, and fund transfer at Micro-ATMs. Operated by NPCI, it enables banking services for citizens without cards, phones, or internet connectivity.

Q: A proxy server can be used to bypass geographic content restrictions.

True – Proxy servers act as intermediaries between client and internet, masking the user's real IP address. By connecting through a proxy in another country, users can access geo-restricted content. However, many services now detect and block proxy/VPN traffic. Legal and policy considerations apply.

Q: A type of malware that replicates itself to spread to other computers without user intervention is called a ________.

Worm – Computer Worm is standalone malware that self-replicates to spread across networks, exploiting vulnerabilities without requiring user action (unlike viruses that need host files). Worms can consume bandwidth, install backdoors, or deliver payloads. Prevention: network segmentation, patching, firewall rules.

Q: Which SQL command is used to permanently save transaction changes in a database?

COMMIT – COMMIT permanently saves all changes made during a transaction to the database. ROLLBACK undoes uncommitted changes. Transactions follow ACID properties (Atomicity, Consistency, Isolation, Durability). Proper use of COMMIT/ROLLBACK ensures data integrity in multi-user database environments.

Q: The technology that uses algorithms to make predictions or decisions without being explicitly programmed is called ________ Learning.

Machine – Machine Learning enables systems to learn patterns from data and improve performance on tasks without explicit programming. Types: Supervised (labeled data), Unsupervised (pattern discovery), Reinforcement (reward-based learning). Applications: recommendation engines, fraud detection, predictive maintenance.

Q: Virtual memory allows a computer to use hard disk space as an extension of RAM.

True – Virtual memory is a memory management technique where the OS uses a portion of hard disk (page file/swap space) as an extension of physical RAM. Allows running programs larger than available RAM by swapping inactive pages to disk. Slower than physical RAM but enables multitasking and larger address spaces.

Q: Which of the following is a social engineering attack?

Phishing – Phishing is a social engineering attack where attackers impersonate legitimate entities via email/SMS to trick victims into revealing credentials or installing malware. Unlike technical exploits (buffer overflow, SQL injection), social engineering manipulates human psychology. Training and awareness are key defenses.