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  • NASA-ISRO Synthetic Aperture Radar (NISAR)

    Why in the News?

    The NASA-ISRO Synthetic Aperture Radar (NISAR) has been successfully launched from Sriharikota using GSLV Mk-II.

    NASA-ISRO Synthetic Aperture Radar (NISAR)

    About NISAR (NASA–ISRO Synthetic Aperture Radar):

    • Launch Vehicle: GSLV Mk-II | Launch Site: Sriharikota, India
    • Mission Life: 3 years (planned); 5+ years (design)
    • Orbit: Sun-synchronous polar orbit at 747 km with 98.4° inclination
    • Objective: High-precision monitoring of Earth’s surface changes—tectonics, agriculture, ecosystems, ice, floods, and landslides
    • Data Access: Free and near real-time; disaster maps delivered in under 5 hours
    • Hardware Contributions:
      • NASA: L-band SAR, 12m antenna, avionics
      • ISRO: S-band SAR, satellite bus, launch services
    • Development and Collaboration:
      • Initial Concept: 2007 (NASA); ISRO joined in 2012
      • Formal Agreement: 2014
      • Investment: NASA – ~$1.16 billion; ISRO – ~$90 million

    Key Features of NISAR:

    • What is Synthetic Aperture Radar (SAR)?
      • Operates day/night, all-weather
      • Simulates large radar antenna via motion
      • Penetrates clouds, vegetation, and soil
    • Dual-Band SAR:
      • L-band SAR (1.257 GHz):
        • Deeper penetration; ideal for forests, tectonic shifts, permafrost
      • S-band SAR (3.2 GHz):
        • Surface details; supports agriculture, flood mapping, biomass tracking
    • Radar Antenna:
      • 12-meter deployable mesh reflector
      • Resolution: 3–10 m spatial; cm-level vertical
      • Swath Width: 240 km
    • Imaging Frequency:
      • Global land/ice coverage every 12 days
      • Less frequent in polar zones
    • Data Output: Generates 80 TB/day (3x current Earth observatories):
      • Biomass and cropland maps
      • High-resolution flood and infrastructure data

    Applications and Impact:

    • Disaster Relief: Before-and-after imagery for planning
    • Climate Monitoring: Glacier melt, forest degradation
    • Agriculture: Crop health, rotation, food security
    • Infrastructure: Detects land subsidence (dams, cities)
    • Strategic Value:
      • Most powerful Earth-observing radar satellite
      • First with dual SAR payload
      • Strengthens India–US space partnership (Artemis, human spaceflight)
    [UPSC 2010] Question: In the context of space technology, what is Bhuvan, recently in the news ?

    Options: (a) A mini satellite launched by ISRO for promoting the distance education in India (b) The name given to the next Moon Impact Probe, for Chandrayaan-II (c) A geoportal of ISRO with 3D imaging capabilities of India* (d) A space telescope developed by  India

     

  • Five years of National Education Policy (2020)

    Why in the News?

    It has been five years since the introduction of the National Education Policy (NEP) 2020 which replaced the 1986 National Policy on Education.

    About the National Education Policy, 2020:

    • Origin: Drafted by a committee chaired by Dr. K. Kasturirangan under the Ministry of Education.
    • 5 Core Pillars: Based on Access, Equity, Quality, Affordability, and Accountability.
    • Vision: Seeks to build a knowledge society by unlocking every learner’s potential.
    • Global Link: Aligned with the UN Sustainable Development Goal (SDG) 4 (Education for All).

    Key Provisions:

    • [A] School Education:
      • Curriculum Structure: Introduces 5+3+3+4 design (Foundational to Secondary), replacing 10+2.
      • ECCE Focus: Early Childhood Care and Education via Jaadui Pitara kits and play-based learning.
      • Vocational Training: Begins from Grade 6 with internships.
      • Basic Literacy & Numeracy: Achieved through National Initiative for Proficiency in Reading with Understanding and Numeracy.
      • Language Medium: Emphasis on mother tongue/regional language up to Grade 5.
      • Assessment Reform: Launch of Performance Assessment, Review and Analysis of Knowledge for Holistic Development (PARAKH) as a national evaluation centre.
    • [B] Higher Education:
      • Four-Year Degree: Multidisciplinary courses with multiple exit points.
      • Credit Bank: Academic Bank of Credit ensures credit mobility across institutions.
      • Research Boost: National Research Foundation supports innovation and research.
      • Single Regulator: Higher Education Commission of India proposed (pending law) to replace multiple bodies.
      • Language Promotion: Establishment of Indian Institute of Translation and Interpretation for Indian languages.

    Implementation Initiatives:

    • Foundational Mission: NIPUN Bharat aims to achieve basic literacy and numeracy by Class 3.
    • Unified Credit System: Rollout of Academic Bank of Credit and National Credit Framework.
    • Common Entrance: Common University Entrance Test introduced for fair UG admissions.
    • Early Prep: Vidya Pravesh – a 3-month play-based module for Grade 1 entrants.
    • Tech Education in Regional Languages: Promoted by the All-India Council for Technical Education.
    • Digital Backbone: National Digital Education Architecture launched to support e-learning.
    • SAFAL Assessments: Structured competency-based testing in Grades 3, 5, and 8 by Central Board of Secondary Education.

    Key Achievements:

    • Curriculum and Textbooks: NCERT released new content for Classes 1–8.
    • ECCE Adoption: Early childhood curriculum implemented in several states.
    • Language Expansion: Regional language instruction expanded at foundational levels.
    • Academic Flexibility: Credit-based transfer systems in use via Academic Bank of Credit and National Credit Framework.
    • Global Presence: Indian Institutes such as Indian Institute of Technology (Zanzibar) and Indian Institute of Management (Dubai) now abroad.
    • International Collaboration: Foreign universities invited to set up campuses under new regulations.
    [UPSC 2016] “SWAYAM’, an initiative of the Government of India, aims at

    Options:

    (a) promoting the Self-Help Groups in rural areas

    (b) providing financial and technical assistance to young start-up entrepreneurs

    (c) promoting the education and health of adolescent girls

    (d) providing affordable and quality education to the citizens for free*

     

  • Pralay Missile 

    Why in the News?

    The Defence Research and Development Organisation (DRDO) successfully conducted two consecutive test flights of the Pralay missile from the Dr. A.P.J. Abdul Kalam Island off Odisha’s coast.

    Pralay Missile 

    About Pralay Missile:

    • Developer: Defence Research and Development Organisation (DRDO), led by Research Centre Imarat (RCI) with Indian industry support.
    • Purpose: Tactical surface-to-surface missile for precision strikes along sensitive borders like the Line of Actual Control (LAC) and Line of Control (LoC).
    • Role: Enhances India’s conventional deterrence in short-range battlefield operations.
    • Targets: Designed to destroy high-value assets—radars, command centers, airstrips, and military infrastructure.

    Key Features:

    • Type: Quasi-ballistic surface-to-surface missile
    • Range: 150–500 km
    • Payload: 500–1,000 kg (conventional warheads)
    • Propulsion: Solid-propellant rocket motor
    • Launcher: Mobile platform for rapid deployment
    • Guidance: Advanced inertial navigation with <10 m Circular Error Probable (CEP)
    • Terminal Speed: Up to Mach 6.1
    • Maneuverability: Capable of mid-air trajectory changes to evade interception
    [UPSC 2023]  Consider the following statements:

    1. Ballistic missiles are jet-propelled at subsonic speeds throughout their fights, while cruise missiles are rocket-powered only in the initial phase of flight. 2. Agni-V is a medium-range supersonic cruise missile, while BrahMos is a solid-fuelled intercontinental ballistic missile.

    Which of the statements given above is/are correct?

    Options: (a) 1 only (b) 2 only (c) Both 1 and 2 (d) Neither 1 nor 2*

     

  • National Population Register (NPR)

    Why in the News?

    The Government of India recently clarified in the Lok Sabha that no final decision has been taken regarding the updation of the National Population Register (NPR) during the upcoming Population Census 2027.

    What is the National Population Register (NPR)?

    • Overview: NPR is a register of “usual residents” in India—individuals who have lived in an area for 6 months or intend to stay for the next 6 months.
    • Conducted by: Office of the Registrar General of India (RGI), Ministry of Home Affairs.
    • Legal Basis: Prepared under the Citizenship Act, 1955 and Citizenship Rules, 2003.
    • Mandatory Nature: Registration in NPR is compulsory for all usual residents.
    • Exclusion: Assam is excluded as it has completed the National Register of Citizens (NRC) process.
    • Historical Background:
      • First Created: In 2010 during the House Listing phase of Census 2011.
      • Updated: Again in 2015–16 via door-to-door survey.
      • Database Size: Contains data of around 119 crore residents.
      • Aadhaar Link: Biometric data collection is linked to Aadhaar; however, ration card data collection was dropped in the 2020 plan.
      • Current Status: NPR update plans (2020) are on hold. NPR’s priority has reduced due to Aadhaar’s expanded utility in benefit delivery.
    • Scope and Data Collected:
      • Coverage Levels: Conducted at local, sub-district, district, state, and national levels.
      • Demographic Data: Includes name, age, gender, relationship, marital status, etc.
      • Biometric Data: Sourced via Aadhaar enrolment—fingerprints, iris scan, and photo.

    NPR vs National Register of Citizens (NRC):

    Feature National Population Register (NPR) National Register of Citizens (NRC)
    Purpose Record of all usual residents Register of Indian citizens
    Coverage Includes citizens and non-citizens Only Indian citizens
    Legal Basis Citizenship Act, 1955 & Rules (2003) Citizenship Rules (2003)
    Primary Use Welfare schemes, demographic data Citizenship verification
    Mandatory? Yes Not uniformly across India

     

    [UPSC 2009] Consider the following statements:

    1. Between Census 1951 and Census 2001, the density of the population of India has increased more than three times.

    2. Between Census 1951 and Census 2001, the annual growth rate (exponential) of the population of India has doubled.

    Which of the statements given above is/are correct?

    Options: (a) 1 only (b) 2 only (c) Both 1 and 2 (d) Neither 1 nor 2*

     

  • Sundarbans set to become India’s Second-Largest TR

    Why in the News?

    The proposal to expand the Sundarbans Tiger Reserve by 1,100 sq km has received clearance from the National Tiger Conservation Authority (NTCA) and awaits approval from National Board for Wildlife (NBWL).

    Sundarbans set to become India’s Second-Largest TR

    About Sundarbans Tiger Reserve (STR):

    • Location: Situated in South and North 24-Parganas districts, West Bengal; lies at the southern tip of the Gangetic Delta.
    • Area: Presently 2,585.89 sq km; expansion to 3,629.57 sq km under proposal.
    • Status: Notified as a Tiger Reserve, National Park, Biosphere Reserve; part of the UNESCO World Heritage Site.
    • Unique Feature: World’s only mangrove forest with a viable tiger population.
    • Tiger Count: Over 100 tigers – 80 in core area, 21 in adjoining forests.
    • Landscape: Interconnected estuaries, tidal creeks, and 105 mangrove-covered islands.
    • Flora: Dominated by mangrove species like Avicennia, Rhizophora, Heritiera.
    • Fauna: Includes Royal Bengal Tigers, Fishing Cats, Estuarine Crocodiles, Irrawaddy Dolphins, King Cobras, and endangered reptiles and birds.
    • Boundaries:
      • East: Bangladesh border (Raimangal, Harinbhanga rivers)
      • South: Bay of Bengal
      • North/West: Matla, Bidya, Gomdi Rivers

    Back2Basics: Tiger Reserves in India

    • Overview: A Tiger Reserve is a legally notified area under the Wildlife (Protection) Act, 1972 for the conservation of tigers and biodiversity.
    • Governing Authority: National Tiger Conservation Authority (NTCA), Ministry of Environment, Forest and Climate Change.
    • Origin: Initiated under Project Tiger, launched in 1973.
    • Structure:
      • Core Zone: Highly protected; no human activity allowed; declared as National Park or Sanctuary.
      • Buffer Zone: Surrounds core; allows regulated human use and supports conservation-compatible livelihoods.

    Tiger Reserve Landscape in India (as of 2025):

    • Total Reserves: 58 (up from 46 in 2014)
    • Largest Reserve: Nagarjunasagar-Srisailam, Andhra Pradesh – 3,727.82 sq km
    • Oldest Reserve: Corbett Tiger Reserve, Uttarakhand – established in 1973
    • Newest Reserves: Guru Ghasidas (Chhattisgarh), Ranipur (Uttar Pradesh), Ramgarh Vishdhari (Rajasthan)
    • Top State: Madhya Pradesh – 7 Tiger Reserves
    • Tiger Density: Bandipur TR > Corbett TR > Kaziranga TR (148, 18.6 tigers/sq. km.)
    • Global Tiger Day: Celebrated on 29th July every year

     

    [UPSC 2020] Among the following Tiger Reserves, which one has the largest area under “Critical Tiger Habitat”?”

    Options: (a) Corbett (b) Ranthambore (c) Nagarjunsagar-Srisailam* (d) Sunderbans

     

  • Lessons from past The Chola legacy includes good governance, not just grand temples

    Why in the News?

    Prime Minister Narendra Modi’s visit to Tamil Nadu during the Aadi Thiruvathirai festival at Gangaikonda Cholapuram drew attention due to its subtle political messaging and focus on the legacy of the Chola dynasty, especially Rajendra Chola I.

    How can the Chola administration guide modern local governance?

    • Land and Revenue Management: They conducted detailed land surveys and classified land for fair taxation. Eg: Modern use of digital land records and GIS mapping can improve urban planning and property tax collection.
    • Sustainable Infrastructure: Built durable public works with advanced engineering. Eg: The Brihadisvara Temple shows disaster-resilient design, relevant for today’s urban infrastructure.
    • Grassroots Democratic Traditions: The Chola Sabhas and Ur assemblies practiced local self-governance, aligning with the 73rd and 74th Constitutional Amendments on decentralisation.
    • Efficient Local Administration: Chola-era institutions handled tax collection, infrastructure upkeep, and dispute resolution, offering a model for accountable and participatory governance today.

    Why is Chola water management relevant today?

    • Sustainable Water Use: The Cholas built tanks, canals, and reservoirs for rainwater harvesting and year-round irrigation. Eg: Tamil Nadu can adopt tank rehabilitation for climate-resilient agriculture.
    • Integrated River Management: They managed the Cauvery delta through coordinated water channel planning. Eg: Programs like Namami Gange can apply holistic watershed development inspired by Chola methods.
    • Community-led Water Governance: Local communities maintained water systems, ensuring efficiency and accountability. Eg: Panchayati Raj Institutions can empower village water user associations for decentralised water management.

    What can temple architecture teach about seismic safety?

    • Broad Base & Tapering Design: Chola temples had a wide foundation and pyramid-like structure to distribute weight and resist earthquakes. Eg: Brihadisvara Temple has survived centuries of seismic activity.
    • Interlocking Stone Technique: Used granite blocks without mortar, allowing flexible movement during tremors. Eg: Airavatesvara Temple stones fit precisely, boosting durability.
    • Seismic-Sensitive Construction: Built with awareness of local geology and fault lines for quake resilience. Eg: Southern temples remain structurally stable despite past earthquakes.

    How does invoking the Chola legacy shape modern politics?

    • Cultural Nationalism & Historical Pride: Celebrating the Chola dynasty boosts national pride and showcases India’s ancient global influence. Eg: Leaders highlight Chola maritime trade and temple architecture to project a strong civilisational legacy.
    • Regional Outreach & Political Messaging: Invoking Chola heritage appeals to Tamil identity, aiding political connect with southern states. Eg: PM’s visit to Gangaikonda Cholapuram during Aadi Thiruvathirai signaled a move to gain regional goodwill.

    Conclusion: The legacy of the Chola dynasty offers enduring lessons for contemporary India across governance, infrastructure, water management, architecture, and politics. Their grassroots democratic institutions, efficient local administration, and innovative land and water management practices provide a valuable blueprint for strengthening decentralised governance, promoting sustainable development, and enhancing climate resilience.

    Mains PYQ:

    [UPSC 2022] Discuss the main contributions of Gupta period and Chola period to Indian heritage and culture.

    Linkage: This question is directly related to your query as it broadly asks about the “main contributions” of the Chola period to “Indian heritage and culture.” This scope allows for a comprehensive discussion that goes beyond just art and architecture (grand temples).  It provides an opportunity to elaborate on the administrative acumen of the Cholas, their water management systems, tax and land revenue collection, and democratic processes, which are highlighted in the sources as significant “mundane facets…of modern relevance” and key aspects of their legacy.

  • Divya Deshmukh becomes new Chess World Champion

    Why in the News?

    Divya Deshmukh made history by becoming India’s first Women’s World Cup Champion and only the fourth Indian woman Grandmaster, defeating Koneru Humpy in the final at Batumi, Georgia.

    Divya Deshmukh becomes new Chess World Champion

    Major Achievements of Divya Deshmukh:

    • 2025: Won the FIDE Women’s World Cup, defeating Koneru Humpy. Became India’s 4th woman Grandmaster.
    • 2024: U-20 Girls’ World Champion
    • 2023: Asian Women’s Champion
    • 2022: Indian Women’s National Champion
    • Olympiad: Key contributor to India’s gold in 2025 Chess Olympiad (Budapest).
    • 2013: Became India’s youngest Woman FIDE Master (WFM) at age 7.

    About the FIDE World Chess Championship System:

    • FIDE (Fédération Internationale des Échecs): Global chess body founded in 1924; headquartered in Switzerland.
    • World Championship Format: Played over 14 classical games. A player must score 7.5 points to win.
    • Tiebreaker: If the match ends 7–7, rapid and blitz games are used.
    • Qualification Path:
      • Zonal and Continental Championships
      • FIDE World Cup (knockout)
      • Candidates Tournament (top player faces reigning champion)
    • Special Championships:
      • Women’s World Championship
      • Junior and Youth Championships
      • World Rapid & Blitz Championships

    Key FIDE Events and Titles:

    • FIDE World Cup: Knockout format; major path to the Candidates.
    • FIDE Women’s World Cup: Equivalent format for top female players.
    • Title Hierarchy:
      • Grandmaster (GM) – highest title
      • International Master (IM)
      • FIDE Master (FM)
      • Candidate Master (CM)
      • Women’s Titles: Woman Grandmaster (WGM), Woman International Master (WIM), etc.
    [UPSC 2024] Consider the following statements:

    I. In the finals of the 45th Chess Olympiad held in 2024, Gukesh Dommaraju became the world’s youngest winner after defeating the Russian player Ian Nepomniachtchi.

    II. Abhimanyu Mishra, an American chess player, holds the record of becoming world’s youngest ever Grandmaster.

    Which of the statements given above is/are correct?

    Options: (a) I only (b) II only * (c) Both I and II (d) Neither I nor II

     

  • Amrit Bharat Station Scheme (ABSS)

    Why in the News?

    PM recently stated that 77 stations in Tamil Nadu are being redeveloped under the Amrit Bharat Station Scheme (ABSS), positioning the state as a hub for railway transformation.

    About the Amrit Bharat Station Scheme (ABSS):

    • Launch: 2022 by the Ministry of Railways.
    • Goal: Modernise and develop railway stations through phased, long-term upgrades.
    • Master Plans: Each station gets a tailored roadmap for future improvements.
    • Focus Areas: Multimodal integration, seamless passenger movement, and upgraded amenities.
    • National Significance: Integral to India’s infrastructure push under the Viksit Bharat vision.

    Key Features of ABSS:

    • Passenger Comfort: Larger waiting halls, clean toilets, executive lounges, lifts, escalators, free Wi-Fi, and business-meeting zones.
    • Accessibility & Connectivity: Expanded circulating areas, barrier-free access for persons with disabilities, and smooth links to other transport modes.
    • Aesthetic Upgrades: Modern façades, clear signage, landscaping, and consistently clean premises.
    • Technology & Information: Digital displays, real-time train info, and self-service e-ticketing kiosks.
    • Sustainability: Energy-efficient systems, green-building elements, and water-conservation measures.
    • Customised Development: Station facilities scaled to local footfall and needs—no one-size-fits-all approach.
    [UPSC 2024] Consider the following statements:

    I. Indian Railways have prepared a National Rail Plan (NRP) to create a future ready railway system by 2028. II. ‘Kavach’ is an Automatic Train Protection system developed in collaboration with Germany. III. ‘Kavach’ system consists of RFID tags fitted on track in station section.

    Which of the statements given above are not correct?

    (a) I and II only (b) II and III only (c) I and III only (d) I, II and III*

     

  • Exercise ‘Bold Kurukshetra’, 2025

    Why in the News?

    The 14th edition of the India–Singapore Joint Military Exercise — Exercise Bold Kurukshetra — commenced in Jodhpur.

    About Exercise ‘Bold Kurukshetra’

    • Launch Year: 2005, after the 2003 India–Singapore Defence Cooperation Agreement.
    • Purpose: Strengthen bilateral defence ties, boost operational coordination, and enhance regional security.
    • Frequency: Held annually or biannually, alternating between Indian training zones like Babina and Jodhpur.
    • Participants: Focuses on armoured and mechanised infantry units from India and Singapore.
    • Framework: Conducted under United Nations Peacekeeping mandates, simulating mechanised warfare and joint operations.

    Key Features:

    • Format:
      • Tabletop wargaming and computer-based simulations.
      • Validates doctrines and standard operating procedures in mechanised warfare.
    • Operational Objectives:
      • Improve interoperability and tactical planning.
      • Execute joint manoeuvres and enhance command-level coordination.
      • Build mutual understanding of combat and operational doctrines.
    • Evolution Over Time:
      • Progressed from basic drills to complex command post exercises and live-fire missions.
      • Includes scenario-based planning and real-time decision-making via digital simulations.
    [UPSC 2008] ‘Hand-in-Hand 2007’, a joint anti-terrorism military training was held by the officers of the Indian Army and officers of the Army of which one of the following countries?

    Options: (a) China *(b) Japan (c) Russia (d) USA

     

  • State of Food and Nutrition in the World (SOFI) 2025, Report

    Why in the News?

    The 2025 State of Food Security and Nutrition in the World (SOFI) report highlights alarming levels of child malnutrition and anaemia among women in India.

    About the SOFI Report:

    • Full Name: State of Food Security and Nutrition in the World
    • Published by: Food and Agriculture Organization (FAO), the International Fund for Agricultural Development (IFAD), the United Nations Children’s Fund (UNICEF), the World Food Programme (WFP), and the World Health Organization (WHO).
    • Started in: 1999
    • Purpose: Tracks global hunger, food insecurity, and nutrition. Monitors SDG-2 (Zero Hunger).

    Global Highlights (2025):

    • Hunger Rate: Dropped from 8.5% (2023) to 8.2% (2024)
    • Undernourished People: 735 million globally
    • Double Burden: Undernutrition and obesity rising simultaneously
    • Healthy Diets: Cost rising due to inflation and climate impacts

    India-Specific Findings:

    • Wasting (Under-5): 18.7% – highest globally (21+ million affected)
    • Stunting (Under-5): 37.4 million children
    • Overweight Children: 4.2 million (up from 2.7 mn in 2012)
    • Anaemia in Women (15–49): 53.7% (203 million affected)
    • Undernourished Population: 172 million (12% of population)
    • Unaffordable Healthy Diet: 42.9% can’t afford; cost rose from $2.77 (2017) to $4.07 (2024)
    • Adult Obesity: Doubled in a decade – now 71.4 million
    [UPSC 2016] Which of the following is/are the indicator/ indicators used by IFPRI to compute the Global Hunger Index Report?

    1. Undernourishment             2. Child stunting             3. Child mortality

    Select the correct answer using the code given below.

    Options (a) 1 only (b) 2 and 3 only (c) 1, 2 and 3* (d) 1 and 3 only