Quick Revision

GK One-Line Question & Answer

15541+ short questions with short answers, covering every category and sub-category on the site — no long articles to scroll through. Good for a fast recap before an exam, or a few minutes of daily practice.

Looking for exam process/strategy questions instead? Try the Exam Preparation FAQ →

Computer Fundamentals → Introduction to Computer 37

Polar codes (used in 5G) are provably?
Capacity-achieving codes — first with proved capacity achievement
click to copy
OFDM (Orthogonal Frequency Division Multiplexing) is used in?
WiFi, 4G LTE, 5G, DSL — robust multipath channel transmission
click to copy
MIMO (Multiple Input Multiple Output) technology uses?
Multiple antennas for spatial multiplexing — increasing capacity without extra bandwidth
click to copy
Massive MIMO in 5G uses?
Hundreds of antennas for beamforming and massive spatial multiplexing
click to copy
Beamforming in wireless communications?
Focuses energy in specific direction toward target device
click to copy
Which modulation scheme provides highest spectral efficiency?
1024-QAM (in WiFi 7)
click to copy
Spread spectrum techniques like CDMA use?
Spreading signal over wide frequency band for interference rejection
click to copy
OFDMA (used in WiFi 6/6E and 5G) vs OFDM allows?
Multiple users on different subcarriers simultaneously — improved efficiency
click to copy
Wi-Fi 6E extends Wi-Fi 6 to?
6 GHz band — more spectrum, less congestion
click to copy
Wi-Fi 7 (802.11be) introduces?
Multi-Link Operation (MLO), 4K-QAM, 320 MHz channels — up to 46 Gbps
click to copy
6G wireless technology is expected to operate in?
THz (Terahertz) frequencies for extremely high data rates
click to copy
GEO satellite at 35,786 km has what approximate one-way latency?
120 ms
click to copy
Which Indian landmark was identified as a location for first computer installation?
Indian Statistical Institute Kolkata (1956)
click to copy
NIC (National Informatics Centre) in India provides?
IT infrastructure and e-governance services to Government of India
click to copy
Digital India initiative aims to?
Transform India into digital society with e-governance, connectivity, digital literacy
click to copy
Aadhaar biometric system uses?
10 fingerprints, 2 iris scans, and photograph for identity
click to copy
UPI (Unified Payments Interface) was developed by?
NPCI (National Payments Corporation of India)
click to copy
NPCI also manages which payment system?
RuPay card network and IMPS, NACH, NEFT processing
click to copy
C-DAC (Centre for Development of Advanced Computing) is located in?
Pune (Headquarters)
click to copy
IIT (Indian Institute of Technology) network is connected through?
NKN (National Knowledge Network) providing high-speed connectivity to academic institutions
click to copy
e-Governance in India uses which portal for central services?
umang.gov.in / india.gov.in
click to copy
GeM (Government e-Marketplace) is used for?
Government procurement of goods and services
click to copy
DigiLocker is?
Cloud-based document storage for authenticated government documents
click to copy
Which Indian state launched first e-Governance project Bhoomi?
Karnataka (land records computerization)
click to copy
COWIN platform was developed for?
COVID-19 vaccine registration and certificate management
click to copy
Aarogya Setu app was developed for?
COVID-19 contact tracing and health status
click to copy
ISRO uses which ground station network for satellite communication?
ISTRAC (ISRO Telemetry, Tracking and Command Network)
click to copy
Chandrayaan missions use onboard computers with which radiation-hardened processors?
Radiation-hardened (RadHard) processors like LEON (SPARC-based)
click to copy
IRNSS (NavIC) is India's own?
Regional Navigation Satellite System covering India and surroundings
click to copy
NavIC provides coverage over?
India and ~1500km surrounding region
click to copy
GAGAN (GPS Aided GEO Augmented Navigation) improves?
GPS accuracy over India using geostationary satellites
click to copy
Data localisation law in India requires?
Certain data of Indian users to be stored within India
click to copy
IT Act 2000 (India) covers?
Cyber crimes, electronic signatures, e-commerce, data protection
click to copy
Section 66A of IT Act was?
Struck down by Supreme Court (2015) as unconstitutional
click to copy
CERT-In (Indian Computer Emergency Response Team) is under?
Ministry of Electronics and Information Technology (MeitY)
click to copy
TRAI (Telecom Regulatory Authority of India) regulates?
Telecom and broadcast services including internet regulation
click to copy
Net Neutrality principle ensures?
All internet traffic is treated equally without discrimination
click to copy

Computer Fundamentals → Internet Basics 1

LEO satellite internet (Starlink) orbits at?
550 km (LEO) — much lower latency than GEO
click to copy

Computer Fundamentals → Memory Units 2

India's first supercomputer PARAM 8000 was built in?
1991
click to copy
India's PARAM Siddhi supercomputer ranks in?
Global TOP500 supercomputer list
click to copy