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GK One-Liners

Bite-Sized Knowledge for Quick Learning

September 15, 2025

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Crisp, concise facts perfect for quick revision and last-minute exam preparation.

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How to use today’s GK page

A quick routine: skim One-Liners → test with the Mini-Quiz → deepen with Short Notes.

Daily revision (5–7 min) Exam-ready structure Mobile friendly

📌 One-Liners

  1. Scroll the categories (they may change daily).
  2. Read the bold title then the short sub-line for context.
  3. Watch for acronyms—today’s quiz/notes expand them.

🧠 Mini-Quiz

  1. Answer the 3 MCQs without peeking.
  2. Tap Submit to reveal answers and explanations.
  3. Note why an option is correct—this locks facts into memory.

🔑 Short Notes

  1. Read the 3 compact explainers—each builds on a different topic.
  2. Use them for a quick recap or add to your personal notes.
  3. Great for mains/PI: definitions, timelines, and “why it matters”.
💡 Pro tip: Use the sticky Jump to menu at the top to hop between sections. If you’re short on time, do One-Liners now and the Mini-Quiz + Short Notes later.

📝 Short Notes • 15 Sep 2025

3 compact, exam-focused notes built from today’s GK365 one-liners. Use for last-minute revision.

India’s External Debt Reaches $736.3 Billion in FY25

Economy

What: India’s external debt stood at $736.3 billion at the end of Financial Year 2025, pushing the debt-to-Gross Domestic Product (GDP) ratio to 19.1 percent. The composition shows long-term borrowings forming 81.7 percent of total external debt, while short-term debt accounts for 18.3 percent and is predominantly driven by trade credits. External debt represents money borrowed by the government, corporations, and financial institutions from foreign lenders denominated in foreign currencies.

How: The external debt includes sovereign borrowings from multilateral institutions like World Bank, Asian Development Bank (ADB), and International Monetary Fund (IMF), commercial borrowings by Indian corporations through External Commercial Borrowings (ECB) route, Non-Resident Indian (NRI) deposits in Indian banks, trade credits extended by foreign suppliers for imports, and multilateral and bilateral development assistance loans. Long-term debt provides stability with repayment periods exceeding one year, while short-term debt under one year primarily finances trade transactions. The debt-to-GDP ratio of 19.1 percent indicates that India’s external debt is manageable compared to many developing economies, though it requires continuous monitoring given rupee depreciation risks and global interest rate fluctuations.

Why: This is crucial for UPSC GS3 (Indian Economy, External Sector). It connects to balance of payments management, external vulnerability indicators, foreign exchange reserves adequacy, sovereign credit ratings, and fiscal sustainability. Questions on external debt components, debt servicing capacity, difference between external and internal debt, and impact of currency depreciation on debt burden appear in Mains. Banking exams extensively cover external debt metrics, ECB regulations, and NRI deposit schemes. Understanding external debt is essential for analyzing India’s macroeconomic stability, the role of capital account liberalization, and risks from global financial market turbulence. The sustainable debt-to-GDP ratio debate, comparison with countries facing debt crises, and Reserve Bank of India’s (RBI) monitoring framework through debt sustainability analysis are key exam topics.

Tirumala Hills & Erra Matti Dibbalu Added to UNESCO Tentative List

Environment

What: Tirumala Hills in Andhra Pradesh and Erra Matti Dibbalu (Red Sand Dunes) near Visakhapatnam were included in UNESCO’s Tentative List of World Heritage Sites. Tirumala Hills features the Eparchaean Unconformity, a geological formation representing a gap of billions of years in the rock record. Erra Matti Dibbalu contains Quaternary geological evidence documenting ancient sea-level changes and paleoclimate conditions. The Tentative List is the first step toward potential inscription as UNESCO World Heritage Sites.

How: The Eparchaean Unconformity at Tirumala represents a geological time gap between ancient Archaean rocks (over 2.5 billion years old) and younger formations, providing insights into Earth’s early crustal evolution and tectonic processes. This unconformity is scientifically significant for understanding continental formation and ancient mountain-building episodes. Erra Matti Dibbalu red sand dunes formed through aeolian (wind-driven) processes and contain fossil evidence, paleosols (ancient soils), and stratigraphic layers documenting Quaternary period (last 2.6 million years) sea-level fluctuations, climate oscillations, and monsoon pattern evolution. The UNESCO Tentative List inclusion requires comprehensive documentation, management plans, conservation strategies, and demonstration of Outstanding Universal Value under UNESCO criteria for natural or cultural significance.

Why: This is important for UPSC GS1 (Geography, Indian Heritage) and GS3 (Environment). It connects to geoheritage conservation, geological time scales, plate tectonics, paleoclimate research, and UNESCO World Heritage Convention. Questions on India’s UNESCO sites, geological formations, unconformities, and heritage conservation mechanisms appear in Prelims and Mains. Banking exams cover India’s UNESCO heritage sites and cultural preservation. The inclusion demonstrates India’s geological diversity beyond cultural heritage sites, supports geotourism development, provides educational value for understanding Earth’s history, and strengthens scientific research infrastructure. The process also highlights the difference between UNESCO Tentative List (preparatory inventory) and final World Heritage Site designation, which requires rigorous evaluation and international approval by UNESCO World Heritage Committee.

TCS & France’s CEA Partner for Physical AI Development

Frontier Tech

What: Tata Consultancy Services (TCS) and France’s Commissariat à l’énergie atomique et aux énergies alternatives (CEA), a leading government-funded research organization, announced a partnership to co-develop Physical AI technologies. Physical AI represents the integration of artificial intelligence with robotics, sensors, and physical systems to enable intelligent machines that can perceive, reason, and act in the real world. The collaboration targets applications in manufacturing automation, logistics optimization, and industrial process control.

How: Physical AI combines computer vision for environmental perception, machine learning for pattern recognition and decision-making, robotics for physical manipulation, sensor fusion for real-time data integration, and edge computing for low-latency processing near data sources. The TCS-CEA partnership will develop AI models that enable robots and autonomous systems to perform complex tasks like quality inspection, predictive maintenance, warehouse management, and adaptive manufacturing. CEA brings expertise in embedded systems, microelectronics, and advanced materials, while TCS contributes software engineering, cloud infrastructure, and industry-specific domain knowledge. The collaboration aligns with India’s National Strategy for Artificial Intelligence and France’s AI for Humanity strategy, fostering technology transfer and joint intellectual property development.

Why: This is relevant for UPSC GS3 (Science & Technology, Economy). It connects to India’s AI mission, Industry 4.0 transformation, international R&D collaborations, automation in manufacturing, and deepening India-France strategic partnership. Questions on AI applications, robotics integration, smart manufacturing, and bilateral technology cooperation appear in Mains GS3. Banking exams cover AI developments and Indian IT sector innovations. The partnership demonstrates India’s positioning in frontier technologies, addresses manufacturing competitiveness through automation, supports Atmanirbhar Bharat through technology capability building, and creates high-skill job opportunities in AI-robotics domain. Physical AI adoption can significantly boost productivity in sectors like automotive, aerospace, pharmaceuticals, and electronics manufacturing while addressing labor shortage challenges in precision tasks.

🧠 Mini-Quiz: Test Your Recall

3 questions from today’s one-liners. No peeking!

1

What is India’s external debt-to-GDP ratio at the end of FY25?

Correct Answer: C — India’s external debt reached $736.3 billion at FY25-end, pushing the debt-to-GDP ratio to 19.1%. Long-term borrowings formed 81.7% of total external debt, while short-term debt (18.3%) was dominated by trade credits. This ratio indicates manageable external debt levels compared to many developing economies, though continuous monitoring remains essential.
2

Which geological feature makes Tirumala Hills significant for inclusion in UNESCO’s Tentative List?

Correct Answer: B — Tirumala Hills features the Eparchaean Unconformity, a geological formation representing a gap of billions of years in the rock record between ancient Archaean rocks and younger formations. This provides crucial insights into Earth’s early crustal evolution and tectonic processes. Erra Matti Dibbalu red sand dunes contain Quaternary evidence documenting ancient sea-level changes.
3

What is the theme for Engineers’ Day 2025 in India?

Correct Answer: C — Engineers’ Day 2025 is observed on 15 September to honor Sir M. Visvesvaraya, with the theme “Deep Tech and Engineering Excellence: Driving India’s Techade.” The theme emphasizes advanced technologies like AI, quantum computing, biotechnology, and space technology that will define India’s technological decade, aligning with the vision of making India a global innovation hub.
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🔑 Short Notes: Build Concept Depth (3 Topics)

Each note gives you a quick What—How—Why on a high-yield news item from today’s GK365 one-liners.

Engineers’ Day 2025: Deep Tech and India’s Techade

Digital Governance

What: Engineers’ Day is observed annually on 15 September to commemorate the birth anniversary of Sir Mokshagundam Visvesvaraya, one of India’s most eminent civil engineers and the Diwan of Mysore who modernized the princely state. The 2025 theme is “Deep Tech and Engineering Excellence: Driving India’s Techade,” emphasizing advanced technologies including artificial intelligence, quantum computing, biotechnology, advanced materials, space technology, and semiconductor manufacturing that will define India’s technological transformation over the coming decade.

How: Sir M. Visvesvaraya contributed significantly to India’s infrastructure development through projects like the Krishna Raja Sagara Dam, Bhadravati Iron and Steel Works, and automated flood gates system. He promoted industrialization, technical education, and planned economic development. The Engineers’ Day celebration involves recognition of engineering achievements, seminars on emerging technologies, student competitions, and policy discussions on strengthening India’s engineering capabilities. The “Techade” concept envisions 2020-2030 as India’s technology decade, requiring engineering excellence in deep tech sectors through increased R&D investment, startup ecosystem strengthening, academia-industry collaboration, and skill development in cutting-edge technologies.

Why: This is relevant for UPSC GS1 (Modern History, Personalities) and GS3 (Science & Technology). It connects to India’s technological self-reliance, engineering education reforms, innovation ecosystem development, and human resource development in STEM fields. Questions on Sir M. Visvesvaraya’s contributions, deep technology sectors, National Education Policy 2020 emphasis on multidisciplinary engineering education, and India’s technology strategy appear in Mains. Banking exams cover important national days and technological developments. The theme aligns with Atmanirbhar Bharat’s emphasis on indigenous technology development, semiconductor mission, quantum technology mission, and space sector reforms. Deep tech sectors are critical for economic growth, job creation, strategic autonomy, and positioning India as a global technology leader rather than just a services provider.

RBI Purchases Nariman Point Land for ₹3,472 Crore

Economy

What: The Reserve Bank of India (RBI) purchased a 4.16-acre freehold land parcel at Nariman Point, Mumbai’s premium commercial district, from Mumbai Metro Rail Corporation Limited (MMRCL) for ₹3,472 crore plus applicable stamp duty. The acquisition is intended for self-use and commercial purposes, though RBI’s headquarters will continue to remain at its historic Fort location. This represents one of the largest real estate transactions in India’s financial capital.

How: Nariman Point, located at the southern tip of Mumbai, is India’s most expensive commercial real estate zone, housing headquarters of major banks, financial institutions, multinational corporations, and professional service firms. The 4.16-acre plot provides significant space for RBI’s expanding operations, training facilities, data centers, and potential revenue generation through commercial leasing. MMRCL, responsible for Mumbai Metro construction, is monetizing land assets to fund metro expansion projects. The transaction demonstrates RBI’s long-term infrastructure planning and asset diversification strategy. The purchase involves complex legal procedures, valuation assessments, and regulatory approvals given the high-value nature and strategic location of the property.

Why: This is important for UPSC GS3 (Economy, Banking Sector). It connects to central banking infrastructure, urban planning, real estate economics, and public sector asset management. Questions on RBI’s functions, organizational structure, Mumbai as financial capital, and real estate market dynamics appear in Mains GS3. Banking exams extensively cover RBI’s role, headquarters location, and institutional developments. The acquisition reflects RBI’s strengthening balance sheet, prudent asset allocation, and forward planning for technological infrastructure needs in the digital banking era. It also demonstrates coordination between financial regulators and urban infrastructure agencies, where land monetization by MMRCL supports metro development while RBI acquires strategic real estate. The transaction highlights premium property values in Mumbai’s CBD, commercial real estate investment trends, and public sector land transactions transparency.

India Defeats Switzerland in Davis Cup, Qualifies for 2026

Sports

What: The Indian tennis team defeated ninth-seeded Switzerland 3-1 in the Davis Cup World Group I tie held in Biel, Switzerland, securing qualification for the Davis Cup 2026 qualifiers. This victory marks a significant achievement as India ended a prolonged wait for an away win against a European nation on their home turf, demonstrating the improving strength and depth of Indian tennis beyond individual star players.

How: The Davis Cup, founded in 1900, is the premier international team competition in men’s tennis, featuring nations competing in a knockout format across multiple rounds. The World Group I represents the second tier of Davis Cup competition, with winners earning promotion to the elite Finals group. India’s victory over Switzerland, a historically strong tennis nation, was achieved through strong performances in both singles and doubles matches. The win reflects improved team cohesion, strategic planning by team management, physical conditioning, and mental toughness in handling pressure situations on foreign clay or hard courts against quality opposition in hostile conditions.

Why: This is relevant for UPSC Current Affairs and General Knowledge sections. While not directly asked in descriptive papers, sports achievements contribute to India’s soft power, national pride, and youth inspiration. Banking exams regularly include questions on major sports tournaments, Indian sports achievements, and international sporting events. The Davis Cup success demonstrates growth in Indian tennis infrastructure, Sports Authority of India coaching programs, and private academies’ contribution to player development. It highlights the importance of team sports culture alongside individual achievements, government support through Target Olympic Podium Scheme applicability to tennis, and emergence of next-generation Indian tennis players. The victory also strengthens India’s tennis legacy built by players like Ramesh Krishnan, Leander Paes, and Mahesh Bhupathi, while providing crucial ranking points and international exposure to younger players preparing for Grand Slam circuits and Olympic qualification.

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