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Generate QuizTechnology – Medium Level – GK Questions
Free practice for SSC, UPSC, Banking & Railway exams. No login required.
Which technology enables bidirectional power flow between electric vehicles and the grid?
- Fast Charging
- Wireless Charging
- Vehicle-to-Grid (V2G)
- Battery Swapping
Answer: Vehicle-to-Grid (V2G)
V2G allows EVs to discharge stored energy back to the grid during peak demand, acting as distributed storage. Supports grid stability, renewable integration, and provides revenue to EV owners. Requires smart chargers and regulatory framework. Emerging topic for energy and transportation questions.
Which operation has O(1) time complexity in a well-implemented hash table?
- Search
- Insert
- Delete
- All of these
Answer: All of these
Hash tables provide average-case O(1) for search, insert, and delete by computing index via hash function. Worst-case O(n) occurs with many collisions. Load factor < 0.75 and good hash functions maintain performance. Understanding complexity trade-offs is essential for algorithm design questions.
The JavaScript event that fires when a web page has fully loaded is ________.
- Engineering Task Force / IETF
- DOMContentLoaded / load
- DID / Decentralized Identifiers
- Indigenization / Self-Reliance
Answer: DOMContentLoaded / load
DOMContentLoaded fires when HTML is parsed (without waiting for styles/images); load fires when all resources (images, CSS) are fully loaded. Choosing appropriate event ensures scripts execute at right time. Critical for web performance and user experience optimization questions.
Which Linux command is used to compress files using gzip?
- zip
- tar
- gzip
- compress
Answer: gzip
gzip compresses individual files using DEFLATE algorithm, producing .gz extension. tar bundles multiple files (often combined with gzip as .tar.gz). zip creates .zip archives compatible across platforms. Understanding compression tools is essential for backup, storage optimization, and file transfer in system administration.
Energy-efficient buildings in India are certified under the GRIHA rating system.
- True
- False
Answer: True
GRIHA (Green Rating for Integrated Habitat Assessment) is India's national rating system for green buildings, developed by TERI and Ministry of New & Renewable Energy. Evaluates energy/water efficiency, waste management, and sustainable materials. LEED is an international alternative. Important for sustainable development questions.
Which provision of the DPDP Act 2023 allows data principals to correct inaccurate personal data?
- Right to Access
- Right to Correction
- Right to Erasure
- Right to Portability
Answer: Right to Correction
DPDP Act grants data principals rights including: access to summary of processed data, correction of inaccurate/incomplete data, erasure when purpose is fulfilled, and grievance redressal. These rights empower individuals and impose obligations on data fiduciaries. Critical for privacy compliance questions.
A graph with no cycles is called a ________.
- Integration / Warehousing
- India
- Chandrayaan
- Tree / Acyclic Graph
Answer: Tree / Acyclic Graph
A connected acyclic graph is a Tree; disconnected acyclic graph is a Forest. Cycles are paths that start and end at same node. Detecting cycles is important in dependency resolution, deadlock prevention, and network analysis. Graph theory fundamentals are tested in SSC JE and programming exams.
In Linux, the sudo command allows authorized users to execute commands with superuser privileges.
- True
- False
Answer: True
sudo (superuser do) grants temporary elevated privileges to authorized users as defined in /etc/sudoers. Promotes least-privilege security model by avoiding persistent root login. Users authenticate with their own password. Critical concept for secure system administration in technical exams.
Which type of solar panel has the highest efficiency but also highest cost?
- Monocrystalline
- Polycrystalline
- Thin-film
- Amorphous
Answer: Monocrystalline
Monocrystalline panels use single-crystal silicon, offering 15-22% efficiency and longer lifespan but higher cost. Polycrystalline is cheaper with 13-16% efficiency. Thin-film is flexible and lightweight but less efficient (10-13%). Choice depends on space, budget, and application. Relevant for renewable energy questions.
The Indian agency responsible for investigating cybercrime cases at the national level is ________.
- MITRE ATT&CK
- Semiconductor
- NIA / CBI Cyber Cell
- Nature-based / Biological
Answer: NIA / CBI Cyber Cell
While state police handle most cybercrime, National Investigation Agency (NIA) and CBI Cyber Crime Cell investigate major inter-state/international cyber offenses. Indian Cyber Crime Coordination Centre (I4C) under MHA coordinates response. Understanding jurisdiction and agencies is important for law enforcement questions.
CSS Flexbox is designed for one-dimensional layouts (either row or column).
- True
- False
Answer: True
Flexbox handles one-dimensional layouts: arrange items in a row OR column with flexible sizing, alignment, and order. CSS Grid handles two-dimensional layouts (rows AND columns). Both are modern layout systems replacing floats/positioning. Understanding their use cases is important for responsive design questions.
Which Linux command displays the manual page for a specific command?
- help
- man
- info
- doc
Answer: man
man (manual) displays documentation for Linux commands, system calls, and configuration files. Example: man ls shows options and usage. help is for shell builtins; info provides hypertext docs; doc is not standard. Proficiency with man is essential for self-learning and troubleshooting in system administration.
The technology that captures CO2 emissions from industrial sources for storage or reuse is called ________ Capture and Storage.
- Testable
- Worm
- Carbon
- NDMA App / Disaster Alert
Answer: Carbon
CCS (Carbon Capture and Storage) captures CO2 from power plants/industries, transports it, and stores underground or uses in products (concrete, fuels). Critical for decarbonizing hard-to-abate sectors. India is developing CCS roadmap as part of net-zero strategy. Emerging topic for environment and technology exams.
Hash tables provide average-case O(1) time complexity for search, insert, and delete operations.
- True
- False
Answer: True
Hash tables use hash functions to map keys to array indices, enabling average O(1) operations. Worst-case O(n) occurs with many collisions (resolved via chaining/open addressing). Load factor and good hash functions maintain performance. Critical data structure for efficient lookups in real-world applications and exams.
Which JavaScript method is used to select an HTML element by its ID?
- querySelector()
- getElementById()
- getElementsByClassName()
- getElementsByTagName()
Answer: getElementById()
getElementById('id') returns the element with specified ID (case-sensitive). querySelector() uses CSS selectors for more flexibility. getElementsByClassName/TagName return collections. DOM manipulation is core to interactive web development and frequently tested in programming sections of exams.
Which Indian initiative aims to install 450 GW of renewable energy capacity by 2030?
- National Solar Mission
- Panchamrit Strategy
- Green Energy Corridor
- Surya Mitra
Answer: Panchamrit Strategy
Panchamrit (five nectars) announced at COP26 includes: 500 GW non-fossil capacity by 2030 (updated from 450 GW), 50% energy from renewables, 1 billion tonne CO2 reduction, net-zero by 2070. National Solar Mission is a component; Green Energy Corridor enables transmission; Surya Mitra trains solar technicians.
Under the IT Act 2000, intermediaries like social media platforms are liable for third-party content they host.
- True
- False
Answer: False
Section 79 of IT Act provides safe harbor to intermediaries if they: (1) only provide access, (2) don't initiate/modify transmission, (3) observe due diligence and remove content upon actual knowledge. IT Rules 2021 add grievance redressal and traceability requirements. Critical for understanding platform liability.
Which data structure uses FIFO (First-In-First-Out) principle?
- Stack
- Queue
- Linked List
- Tree
Answer: Queue
Queue follows FIFO: first element added is first removed. Operations: enqueue (add rear), dequeue (remove front). Used in CPU scheduling, print spooling, breadth-first search. Stack follows LIFO. Understanding fundamental data structure behaviors is essential for programming exams.
The CSS box model consists of content, padding, border, and ________.
- margin
- Rain
- Randomized
- Ka
Answer: margin
CSS Box Model: content (actual text/image) → padding (space inside border) → border (edge around padding) → margin (space outside border). Understanding this model is crucial for layout design and responsive web development. Frequently tested in web technology sections of technical exams.
Which Linux command is used to search for a specific string within files?
- find
- grep
- locate
- search
Answer: grep
grep (global regular expression print) searches files for lines matching a pattern/string. Supports regex, recursive search, and context display. find locates files by name/path; locate uses a database; search is not a standard command. Essential for log analysis and text processing in system administration.