Technology – GK Questions

DigiLocker is a cloud-based platform under Digital India that enables citizens to store, share, and verify important documents digitally. Documents issued by registered authorities through DigiLocker have legal validity under the Information Technology Act, 2000.

Quantum Computing uses qubits that can exist in superposition (0 and 1 simultaneously) and entanglement (correlated states) to solve certain problems exponentially faster than classical computers, with applications in cryptography, drug discovery, and optimization.

Wi-Fi is a wireless technology that allows devices to connect to a local network without cables. Internet is the global network of networks. Wi-Fi provides local wireless access; you still need an ISP connection to access the internet via Wi-Fi.

NPCI (National Payments Corporation of India) developed the Unified Payments Interface (UPI). NPCI also operates other payment systems like IMPS, RuPay, Aadhaar Enabled Payment System (AePS), and Bharat Bill Payment System (BBPS).

Scanner is an input device that captures images, text, or objects and converts them into digital format. Monitor, printer, and speaker are output devices that display or present processed information to the user.

SaaS stands for Software as a Service, where applications are hosted by a provider and made available to customers over the internet (e.g., Google Workspace, Microsoft 365). Storage as a Service is a different cloud model, while IaaS and PaaS are other main categories.

Mangalyaan (Mars Orbiter Mission), launched in 2013, made India the first Asian nation and fourth space agency globally to reach Mars orbit. It was completed at a cost of just $74 million, making it one of the least expensive Mars missions.

Ransomware is malicious software that encrypts files on victim's device and demands ransom (usually in cryptocurrency) for the decryption key. Prevention includes regular backups, updated antivirus, and avoiding suspicious email attachments.

SELECT is the SQL command used to query and retrieve data from one or more tables. INSERT adds new records, UPDATE modifies existing records, and DELETE removes records. SELECT is the most frequently used command in database operations.

5G operates across three spectrum bands: low-band (<1 GHz) for wide coverage, mid-band (1-6 GHz) for balanced speed/coverage, and high-band/mmWave (24-100 GHz) for ultra-high speeds in dense areas. India primarily uses mid-band for 5G rollout.

Aadhaar is a 12-digit unique identification number issued by UIDAI to Indian residents based on biometric and demographic data. It enables targeted delivery of subsidies and services through Direct Benefit Transfer (DBT) system.

AES (Advanced Encryption Standard) is a symmetric algorithm using the same key for encryption and decryption. RSA, ECC, and Diffie-Hellman are asymmetric algorithms using public-private key pairs. AES is widely used for securing sensitive data.

In binary system used by computers, 1 KB = 1024 bytes (2^10). The decimal approximation of 1000 bytes is used by storage manufacturers, causing confusion. IEC standards now use KiB (Kibibyte) for 1024 bytes to avoid ambiguity.

Machine Learning is a subset of Artificial Intelligence where algorithms improve automatically through experience and data. It includes supervised, unsupervised, and reinforcement learning approaches used in recommendation systems, fraud detection, and more.

DNS (Domain Name System) translates human-readable domain names into numerical IP addresses that computers use to identify each other on the network. Without DNS, users would need to remember IP addresses like 142.250.189.206.

UPI (Unified Payments Interface) operates 24x7x365, including weekends and bank holidays. This round-the-clock availability is one of its key advantages over traditional NEFT/RTGS systems which have time restrictions.

PSLV (Polar Satellite Launch Vehicle) is called ISRO's workhorse due to its reliability in launching earth observation and remote sensing satellites into polar sun-synchronous orbits. It has successfully launched Chandrayaan-1 and Mangalyaan.

OTP stands for One Time Password - a automatically generated numeric or alphanumeric string that authenticates a user for a single transaction or login session, enhancing security beyond static passwords.

RAM (Random Access Memory) is volatile memory used for temporary storage of data and machine code currently being used. It loses all data when power is switched off, unlike ROM or hard disk which are non-volatile.

UMANG (Unified Mobile Application for New-age Governance) provides access to over 1,200+ services from both central AND state governments, including utilities, education, health, and travel services across India.