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Type: Prelims Only

  • What are Flying Rivers/ Atmospheric Rivers?

    Why in the News?

    Droughts and fires in South America highlight the importance of “flying rivers” — rain-bearing vapor streams disrupted by Amazon deforestation.

    What are Atmospheric Rivers?

    • Overview: Long, narrow bands of concentrated water vapour in the lower atmosphere, often termed “rivers in the sky.”
    • Dimensions: Typically 2,000–5,000 km long, 400–500 km wide, and about 3 km deep.
    • Water Transport: Carry nearly 90% of water vapour across Earth’s mid-latitudes — almost double the Amazon River’s flow.
    • Formation: Warm tropical seawater evaporates, and winds transport this moisture; upon encountering land or mountains, vapour condenses into heavy rainfall or snow.
    • Role: Unlike short-term weather systems, Atmospheric Rivers (ARs) shape long-term hydrological cycles and trigger extreme precipitation events.

    Global Impacts of Atmospheric Rivers:

    • Flooding & Extreme Weather: Cause 80% of flood-related damages along the US West Coast; also linked to devastating floods in Europe, Africa, South America, and Australia.
    • South America: Amazon’s “flying rivers” disrupted by deforestation, leading to droughts in Peru, Bolivia, and Ecuador; threatens Amazon rainforest’s survival and risks savannisation.
    • East Asia: Up to 80% of heavy rainfall events in China, Korea, and Japan during early monsoon linked to ARs.
    • Climate Connection: Warming oceans are making ARs longer, wider, and more intense, increasing risks of catastrophic floods and landslides.
    • Positive Role: Contribute 30–50% of annual precipitation in some regions (e.g., US West Coast) and help end 33–74% of droughts.

    Atmospheric Rivers in India’s Context:

    • Interaction: ARs combine with cyclonic circulations and the Himalayan ranges, causing extreme rainfall and flash floods.
    • Case Studies:
      • 2010 Leh cloudburst (Ladakh) – flash floods and mudslides.
      • 2011 Kupwara floods (J&K) – severe AR-driven rainfall.
    • Study (1951–2020): Identified 574 AR events during the monsoon season in India.
    • Recent Trends: Nearly 80% of India’s most severe floods (1985–2020) linked to AR activity.
    • Cause: Rapid Indian Ocean warming intensifies evaporation, moisture transport, and AR-driven floods.
    • Impact: Leads to short, intense rainfall spells, landslides, flash floods, crop loss, and mass displacement of communities.
    [UPSC 2024] With reference to “water vapour,” which of the following statements is/are correct?

    1. It is a gas, the amount of which decreases with altitude.

    2. Its percentage is maximum at the poles.

    Select the answer using the code given below:

    Options: (a) 1 only* (b) 2 only (c) Both 1 and 2 (d) Neither 1 and 2

     

  • [pib] Centre approves National Pulses Mission

    Why in the News?

    The Union Minister for Agriculture & Farmers’ Welfare and Rural Development has approved the National Pulses Mission (Mission for Atmanirbharta in Pulses).

    About the National Pulses Mission:

    • Launch (2025): Approved by the Union Minister for Agriculture & Farmers’ Welfare and Rural Development to achieve self-sufficiency in pulses by 2030–31, improve nutrition, and raise farmer incomes.
    • Targets: Production to rise from 24.2 MT (2024–25) to 35 MT (2030–31); acreage 310 lakh ha, yield 1,130 kg/ha.
    • Coverage: 416 districts, with focus on rice fallows, improved seeds, intercropping, irrigation, and market linkages.
    • MSP Procurement: 100% assured for Tur, Urad, Masoor for four years under PM-AASHA Price Support Scheme, via NAFED/NCCF.
    • Framework: Under National Food Security Mission (NFSM); combines ICAR-led R&D with private sector inputs, processing, and storage.
    • Budget: ₹11,440 crore outlay up to 2030–31 for multi-year implementation.
    • Outcomes: Improved nutrition, soil fertility (nitrogen-fixing), stable prices, climate resilience, and rural employment.

    Key Features:

    • Cluster-Based Approach: Targets high-potential regions, diversifies beyond traditional belts, reduces risks.
    • Market Infrastructure: 1,000 post-harvest units (dal mills, grading, packaging) with subsidies up to ₹25 lakh/unit.
    • Research & Extension: New high-yield, climate-resilient varieties; farmer training on nutrient, pest, and water management.
    • Risk Cover: Subsidies, insurance, and credit to reduce cultivation risks.
    • Market Reforms: Direct sales linkages, transparent logistics, MSP-backed procurement.
    [UPSC 2020] With reference to pulse production in India, consider the following statements:

    1. Black gram can be cultivated as both kharif and rabi crop.

    2. Green-gram alone accounts for nearly half of pulse production.

    3. In the last three decades, while the production of kharif pulses has increased, the production of rabi pulses has decreased.

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

     

  • [pib] BRO Project Swastik marks 65 years of service

    Why in the News?

    Border Roads Organisation (BRO) Project Swastik celebrated its 65th Raising Day on October 01, 2025.

    About Project Swastik:

    • Origin: Established in 1960 as Project DRAGON, renamed Project Swastik on 1 October 1963.
    • Organisation: A flagship initiative of the Border Roads Organisation (BRO) under the Ministry of Defence.
    • Mandate: Construction and maintenance of strategic roads, bridges, and tunnels in the high-altitude Himalayan terrain.
    • Area of Responsibility: Covers North and East Sikkim up to forward border areas, also parts of North Bengal. The region is prone to landslides, fragile geology (Phyllites, Schists), and extreme weather conditions.
    • Strategic Role: Provides vital support for Armed Forces mobility, disaster relief operations, and socio-economic connectivity for remote communities.

    Major Accomplishments:

    • Road & Bridge Network: Built and maintained over 1,412 km of roads and 80 major bridges since inception.
    • Recent Achievements: In the last decade, completed 350 km of new roads, 26 bridges, and 1 tunnel, ensuring year-round access to forward areas.
    • Key Road Links: Developed lifelines like the Gangtok–Chungthang and Gangtok–Nathula roads, critical for defence and civilian movement.
    • Disaster Response: Effectively restored connectivity after Glacial Lake Outburst Floods (GLOFs), cloudbursts, and Teesta River floods. Widely praised during the 2023 Sikkim flash floods.

  • SARAL tool to simplify Scientific Research Papers

    Why in the News?

    The Anusandhan National Research Foundation (ANRF), India’s newest science funding agency, has launched a digital tool called SARAL (Simplified and Automated Research Amplification and Learning) to make scientific research more accessible.

    What is Anusandhan National Research Foundation (ANRF)?

    • Establishment: Created under the ANRF Act, 2023, replacing the Science and Engineering Research Board (SERB).
    • Nature: Acts as India’s apex science funding and policy-making body.

    • Mission & Objectives: 

      • Raise India’s R&D spending from 0.7% to 2% of GDP by 2030.
      • Mobilise 70% private sector participation in research funding.
      • Promote interdisciplinary research across sciences, technology, health, agriculture, humanities, and social sciences.
      • Align research with Viksit Bharat 2047 and the National Education Policy (NEP).

    • Structure:

      • Chairperson: Prime Minister of India (ex-officio).
      • Vice Presidents: Union Ministers of Science & Technology and Education.
      • Member Secretary: Principal Scientific Advisor.
      • Guided by a Governing Council and Executive Council for policy and funding.

    About SARAL:

    • Developer: Created by IIIT Hyderabad under the guidance of the Anusandhan National Research Foundation (ANRF).
    • Purpose: Designed to make complex research papers accessible to students, professionals, and the general public.
    • AI Use: Generates summaries in multiple formats such as slides, videos, posters, and podcasts.
    • Language Support: Available in 11 Indian languages, ensuring wider inclusivity in science communication.
    • Workflow: Users upload research papers (LaTeX, arXiv links, PDFs); AI divides into sections (Introduction, Methodology, Results, Discussion, Conclusion); it produces editable slides and video summaries.
    • Significance:
      • Democratises science by converting research into layman-friendly outputs.
      • Enhances science communication and outreach.
      • Builds awareness of cutting-edge research across disciplines.
    [UPSC 2015] Which of the following statements is/are correct regarding National Innovation Foundation-India (NIF)?

    1. NIF is an autonomous body of the Department of Science and Technology under the Central Government.

    2. NIF is an initiative to strengthen the highly advanced scientific research in India’s premier scientific institutions in collaboration with highly advanced foreign scientific institutions.

    Select the correct answer using the code given below:

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

     

  • Geoengineering Proposals for Polar Regions found flawed

    Why in the News?

    A University of Exeter study found five major polar geoengineering methods ineffective and risky, failing criteria for responsible climate intervention.

    Geoengineering in Polar Regions: Study Findings

    Method Description Intended Benefit Key Findings & Limitations
    Stratospheric Aerosol Injection (SAI) Artificially releasing aerosols (SO₂, sulphur particles, TiO₂, CaCO₃) into the stratosphere to reflect sunlight. Reduce surface temperatures by blocking solar radiation.
    • Ineffective in polar winters (no sunlight) and of limited use in summers (ice already highly reflective).
    • Sudden termination can cause “termination shock” with rapid global warming.
    • Potential to disrupt global weather cycles, harming food and water security.
    • No global governance on costs or liability. Estimated cost: $55M/year per country (if 30 nations share).
    Sea Curtains / Sea Walls Massive buoyant barriers anchored to seafloor to block warm currents from reaching ice sheets. Slow melting of glaciers by insulating them from warm water.
    • Technically near-impossible in remote seas like Amundsen (Antarctica).
    • Extremely high costs — >$1 billion/km.
    • Threatens marine circulation, fish migration, and nutrient cycles.
    • Installation in harsh polar seas only possible for few months a year; requires custom-built ships.
    • Risk of toxic materials leaching into ocean.
    Sea Ice Management (Microbeads) Sprinkling glass microbeads over sea ice to increase albedo (reflectivity) and thicken ice. Preserve summer ice, slow down warming.
    • Requires 360M tonnes of beads annually — equal to world’s plastic production.
    • Major logistical and emissions challenges.
    • Beads dissolve quickly, reducing effectiveness.
    • Some studies show beads absorb sunlight, causing net warming.
    • Costly: $500B/year for Arctic deployment; requires 100M pumps, huge energy draw.
    Basal Water Removal Pumping subglacial meltwater from under Antarctic glaciers. Reduce glacier sliding, thus slowing sea-level rise.
    • Flawed logic: subglacial water is constantly replenished by frictional/geothermal heating.
    • Highly emissions-intensive and energy-consuming.
    • Requires continuous monitoring, maintenance, and heavy infrastructure.
    • Long-term sustainability questioned.
    Ocean Fertilisation Adding nutrients (e.g., iron) to stimulate phytoplankton growth, enhancing CO₂ absorption. Sequester more carbon in oceans.
    • No control over which phytoplankton species dominate, creating food chain imbalances. 
    • Could harm marine biodiversity and alter global nutrient cycles.
    • Needs deployment at massive, impractical scale.
    • Risk of side-effects outweighs uncertain benefits.

     

    [UPSC 2020] Consider the following activities:

    1. Spreading finely ground basalt rock extensively on farmlands

    2. Increasing the alkalinity of oceans by adding lime

    3. Capturing carbon dioxide released by various industries and pumping it into abandoned subterranean mines in the form of carbonated waters

    How many of the above activities are often considered and discussed for carbon capture and sequestration?

    Options: (a) Only one (b) Only two (c) All three* (d) None

     

  • NASA’s Interstellar Mapping and Acceleration Probe (IMAP)

    Why in the News?

    NASA has recently launched the Interstellar Mapping and Acceleration Probe (IMAP) aboard a SpaceX Falcon 9 rocket from Kennedy Space Centre, Florida.

    About IMAP Mission:

    • Context: Operates under NASA’s Solar Terrestrial Probes Program, following missions like STEREO and IBEX.
    • Objective: To map the heliosphere boundary, study energetic particle acceleration, and understand how the solar wind interacts with the interstellar medium.
    • Location: Positioned at Sun–Earth Lagrange Point 1 (L1), ~1.5 million km from Earth, ensuring continuous solar observation.

    NASA’s Interstellar Mapping and Acceleration Probe (IMAP)

    Back2Basics: Heliosphere

    • The heliosphere is a vast bubble-like region around the Sun created by the flow of solar wind (charged particles emitted by the Sun).
    • It extends well beyond Pluto and acts as a shield, protecting the solar system from much of the harmful cosmic radiation from interstellar space.
    • Its outer boundary, called the heliopause, marks where solar wind pressure balances with interstellar medium pressure.

    Key Features:

    • Scientific Payload: 10 instruments including- Energetic Neutral Atom Detectors; Charged Particle Detectors and Magnetic & Dust Sensors.
    • Real-Time Alerts: Equipped with I-ALiRT (Active Link for Real-Time) to broadcast space weather data and provide ~30 minutes’ warning of harmful solar radiation.
    • Spacecraft Design: Spin-stabilized, in a Lissajous orbit around L1, ensuring Sun-facing stability.
    • Enhanced Sensitivity: Higher resolution compared to ACE and IBEX, enabling detection of faint cosmic signals.

    Significance:

    • Scientific: Creates the most detailed maps of the heliosphere boundary, improves understanding of solar wind, cosmic rays, and space weather.
    • Technological: Strengthens space weather forecasting, safeguarding satellites, GPS systems, and power grids.
    • Human Spaceflight: Critical for Artemis and future deep-space missions, informing radiation shielding and safe travel routes.
    • Global Collaboration: Complements missions like NASA–ESA’s Solar Orbiter and the upcoming LISA mission, boosting multi-messenger space science.
    • Habitability Research: Provides insights into how heliospheres shield planets, vital for studying Earth’s resilience and exoplanet habitability.
    [UPSC 2016] What is ‘Greased Lightning-10 (GL-10)’, recently in the news?

    Options: (a) Electric plane tested by NASA *

    (b) Solar-powered two-seater aircraft designed by Japan

    (c) Space observatory launched by China

    (d) Reusable rocket designed by ISRO

     

  • Centre directs NGOs to seek FCRA renewal 4 months before expiry

    Why in the News?

    The Ministry of Home Affairs (MHA) has instructed NGOs to submit their Foreign Contribution (Regulation) Act (FCRA), 2010 renewal applications at least four months before expiry.

    About the Foreign Contribution (Regulation) Act (FCRA):

    • Origin: First enacted in 1976 during the Emergency to regulate inflow of foreign funds.
    • FCRA, 2010: Replaced the 1976 Act to strengthen regulation and ensure foreign funds are used for legitimate purposes without compromising sovereignty, security, or national interest.
    • Coverage: Applies to individuals, associations, and organizations receiving foreign contributions.
    • Administration: Managed by the Ministry of Home Affairs.
    • Objectives:
      • Ensure foreign funds are used responsibly.
      • Prevent undue foreign influence on Indian politics, civil society, and governance.
      • Safeguard sovereignty, integrity, and harmony.

    Key Provisions of FCRA, 2010:

    • Registration: Only organizations with definite cultural, social, economic, educational, or religious objectives can apply.
    • Validity: Registration valid for 5 years; renewal required 6 months before expiry.
    • Designated Bank Account: NGOs must open an exclusive FCRA account in SBI, New Delhi.
    • Annual Reporting:
      • Receipts and utilization must be reported annually.
      • Accounts must be audited by a Chartered Accountant.
      • Banks must report foreign fund receipts to MHA.
    • Administrative Expenses: NGOs can use a maximum of 20% of foreign funds for admin costs (earlier 50%).
    • Special Provisions:
      • NGOs can spend up to ₹25 lakh annually outside their constituency/state for projects promoting national unity.
      • In severe natural calamities, MPs/NGOs may allocate up to ₹1 crore for relief anywhere in India.
    • Prohibited Recipients: Foreign funds cannot go to election candidates, journalists, media houses, judges, government servants, political parties or office bearers, or organizations of political nature.
    • Prohibited Activities: NGOs cannot:
      • Represent fictitious entities.
      • Engage in religious conversions.
      • Have records of communal tension, disharmony, or sedition.

    Amendments to FCRA:

    FCRA Amendment Act, 2020

    • Suspension: Government can suspend registration for up to 360 days.
    • Mandatory Aadhaar: All office bearers, directors, and key functionaries must provide Aadhaar.
    • Prohibition on Sub-Granting: NGOs cannot transfer foreign contributions to other NGOs/entities.
    • Reduced Admin Cap: Admin expenses limited to 20% (earlier 50%).
    • Designated SBI Account: All foreign funds must be received only in an FCRA account at SBI, New Delhi.
    • Bar on Public Servants: Public servants prohibited from receiving foreign contributions.
    • Renewal Scrutiny: Renewal applications can be examined for misuse, fictitious status, or rule violations.
    • Surrender of Certificate: NGOs can surrender registration with government approval.

    FCRA Rules, 2022:

    • Raised the annual limit for money received from relatives abroad to ₹10 lakh (earlier ₹1 lakh) without notifying MHA.
    • Strengthened safeguards against harmful foreign contributions.

  • Laser Interferometer Lunar Antenna (LILA) Project

    Why in the News?

    Scientists are planning the Laser Interferometer Lunar Antenna (LILA) Project on the Moon to bypass seismic noise, atmosphere, and frequency limits faced by Earth-based detectors like Laser Interferometer Gravitational-wave Observatory (LIGO).

    What are Gravitational Waves?

    • Overview: Gravitational waves are ripples in the spacetime continuum created when massive objects such as black holes or neutron stars collide.
    • Speed & Effect: They travel at the speed of light, subtly stretching and compressing spacetime. On small scales, effects are extremely weak (e.g., Earth–Moon distance altered by less than an atom’s diameter).
    • Prediction: Proposed by Albert Einstein (1916) in his General Theory of Relativity.
    • First Detection: In 2015, LIGO recorded the first gravitational waves from two colliding black holes 1.3 billion light-years away, confirming their existence.

    Detection on Earth and Challenges:

    • Ground Observatories: LIGO (USA), Virgo (Italy), KAGRA (Japan), GEO600 (Germany) use laser interferometers to detect minuscule delays in light caused by waves.
    • Working of LIGO: Two L-shaped detectors (Louisiana, Washington), each with 4 km arms; differences in reflections signal gravitational waves.
    • Detection Range: Sensitive to events up to 7 billion light years away; frequency range ~100–1,000 Hz.
    • Challenges: Seismic noise, atmosphere, and human activity mask weaker signals.
    • Future Space Missions:
      • LISA (Laser Interferometer Space Antenna, 2030s): Three satellites in triangular formation, sensitive to 0.1 millihertz–0.1 hertz.
      • SKA (Square Kilometre Array, Australia & South Africa): Monitors pulsars for nanohertz waves.
      • Decihertz Gap: Frequencies 0.1–10 Hz remain unexplored, which LILA aims to study.

    About Laser Interferometer Lunar Antenna (LILA) Project

    • Overview: Proposed by Vanderbilt Lunar Labs, USA, to build a gravitational-wave detector on the Moon.
    • Ideal Conditions: The Moon’s polar shadow zones provide ultra-low seismic activity, natural vacuum, and no atmospheric or radio interference.
    • Focus: Sub-hertz gravitational waves, vital for studying intermediate-mass black holes and the early universe.
    • Phases:
      • LILA Pioneer: Can be deployed within this decade using American lunar landers (Blue Origin, Intuitive Machines) and possibly India’s Chandrayaan programme.
      • LILA Horizon: Advanced phase requiring astronauts for setup.
    • Cosmic Symphony Analogy:
      • SKA: Captures low-frequency “bass notes.”
      • LIGO (and future LIGO-India): Detects high-pitched bursts from stellar collisions.
      • LILA: Covers missing middle frequencies, completing the “cosmic raag.”
    • Historical Note: Since Apollo, retro-reflectors on the Moon track Earth–Moon distance. Some scientists suggest the Earth–Moon system itself acts as a natural detector.

    Significance:

    • Scientific Advancement: Opens the decihertz frontier, inaccessible so far.
    • Global Collaboration: Complements LIGO-India (IndIGO project), operational by 2030.
    • Research Potential: Helps study intermediate-mass black holes, cosmic mergers, and universe origins.
    • Lunar Astronomy: Marks the start of using the Moon as a laboratory for space science.
    • Holistic Coverage: With LISA, SKA, and Earth detectors, LILA would map the entire gravitational-wave spectrum, giving a complete picture of the universe.
    [UPSC 2020] The experiment will employ a trio of spacecraft flying in formation in the shape of an equilateral triangle that has sides one million kilometres long, with lasers shining between the craft.”  The experiment in question refers to

    Options: (a) Voyager-2 (b) New Horizons (c) LISA Pathfinder (d) Evolved LISA*

     

  • [pib] Siphon-Based Thermal Desalination System

    Why in the News?

    Researchers at the Indian Institute of Science (IISc) have developed a siphon-based thermal desalination system that overcomes siltation issues, offering a low-cost and scalable solution.

    About Siphon-Based Thermal Desalination System:

    • Overview: Developed by Indian Institute of Science (IISc) researchers to overcome the inefficiencies of conventional solar stills.
    • Purpose: Designed as a low-cost, scalable, and sustainable freshwater solution for off-grid and water-stressed regions.

    • Working: 

      • Principle: Works on siphonage, where a fabric wick draws salty water and gravity maintains continuous flow.
      • Innovation: A grooved metallic surface flushes away salt deposits before crystallization, preventing clogging.
      • Process: Salty water evaporates as a thin film on a heated surface and condenses just 2 mm away on a cooler surface, ensuring high efficiency.

    Key Features:

    • High Efficiency: Generates >6 liters of freshwater per sq. m per hour under sunlight — several times more than conventional solar stills.
    • Multistage Design: Uses stacked evaporator–condenser pairs to recycle heat and boost output.
    • Salt Resistance: Handles up to 20% salinity without clogging, making it effective even for brine treatment.
    • Affordable Materials: Built from aluminum and fabric, keeping costs low.
    • Energy Flexibility: Operates on solar power or waste heat, adaptable to different settings.
    • Scalable Applications: Useful for villages, disaster zones, and island communities.
    • Sustainability: Offers a clean, low-maintenance desalination method without reliance on complex machinery.
    [UPSC 2008] Where was the first desalination plant in India to produce one lakh liters of freshwater per day based on low-temperature thermal desalination principle commissioned?

    Options: (a) Kavaratti * (b) Port Blair (c) Mangalore (d) Valsad

     

  • Kokrajhar-Gelephu and Banarhat-Samtse Railway Lines to Bhutan

    Why in the News?

    India and Bhutan have launched their first-ever rail links, connecting Kokrajhar–Gelephu (69 km, Assam–Bhutan) and Banarhat–Samtse (20 km, West Bengal–Bhutan).

    Kokrajhar-Gelephu and Banarhat-Samtse Railway Lines to Bhutan

    About India–Bhutan Railway Connectivity:

    • Overview: Agreements were signed during PM Modi’s visit to Bhutan (March 2024) and formalised in 2025.
    • Projects:
      1. Kokrajhar–Gelephu line: 6 stations, multiple bridges, viaducts, designed for Vande Bharat trains; expected completion in 4 years.
      2. Banarhat–Samtse line: 2 stations, major & minor bridges, flyovers, underpasses; expected completion in 3 years.
    • Both lines will be fully electrified, giving Bhutan direct access to India’s 1,50,000 km railway network, boosting passenger and goods transport.

    Significance of the Project for India:

    • Bilateral Relations: Strengthens ties with Bhutan, India’s closest neighbour and largest recipient of Indian development assistance.
    • Strategic Security: Enhances regional security and serves as a counterbalance to China’s influence in South Asia.
    • Economic Integration: Supports Bhutan’s trade (80% with India), boosts hydropower exports, and aids industrial development.
    • Tourism & Culture: Improves people-to-people exchanges, especially linking Gelephu’s Mindfulness City and Samtse’s industrial hub.
    • Act East Policy: Advances India’s policy through cross-border infrastructure in the eastern and northeastern region.
    • Rail Diplomacy: Positions Indian Railways as a strategic enabler of diplomacy and connectivity in the neighbourhood.
    [UPSC 2023] With reference to India’s projects on connectivity, consider the following statements:

    1. East-West Corridor under Golden Quadrilateral Project connects Dibrugarh and Surat.

    2. Trilateral Highway connects Moreh in Manipur and Chiang Mai in Thailand via Myanmar.

    3. Bangladesh-China-India-Myanmar Economic Corridor connects Varanasi in Uttar Pradesh with Kunming in China.

    How many of the above statements are correct?

    Options: (a) Only one (b) Only two (c) All three (d) None*