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Type: Prelims Only

  • What are Collisionless Shock Waves?

    Why in the News?

    A recent study published by Johns Hopkins University (USA) and Northumbria University (UK) reveals how Collisionless Shock Waves act as cosmic accelerators, helping subatomic particles gain ultra-high energy and travel vast distances in space.

    What are Collisionless Shock Waves?

    • Collisionless shock waves are disturbances in plasma (ionized gas) where energy transfer occurs without direct particle collisions, relying instead on electromagnetic forces.
    • They are found in supernova remnants, black hole disks, pulsars, magnetars, and planetary magnetospheres.
    • They act as natural cosmic accelerators, boosting electrons and other charged particles to ultra-high speeds.

    Key Findings from the Study

    • NASA’s MMS, THEMIS, and ARTEMIS missions observed an electron acceleration event near Earth’s bow shock on December 17, 2017.
    • Electrons in Earth’s foreshock region gained 500 keV of energy, reaching 86% of the speed of light, a huge increase from their usual 1 keV.
    • Diffusive shock acceleration (known for producing high-energy cosmic rays) requires electrons to already be moving at 50% of light speed before further acceleration can occur.
    • The study identifies how electrons receive this initial boost, a long-standing astrophysical mystery.
    • Scientists have long assumed that supernova explosions are the primary source of cosmic rays.
    • The recent study suggests that planetary magnetospheres interacting with stellar winds could also contribute to high-energy cosmic rays.

    How Shock Waves accelerate Particles without Collisions?

    • Unlike in solids, liquids, or gases, where energy is transferred via molecular collisions, plasma particles interact through electromagnetic fields.
    • This allows shock waves to accelerate electrons without direct contact.
    • Multi-Stage Acceleration Process:
      1. Plasma waves interact with electrons, imparting initial energy.
      2. Magnetic turbulence in the shock front causes electrons to spiral, further increasing their speed.
      3. Repeated interactions with plasma waves push electrons to relativistic speeds.
    • Role of Earth’s Bow Shock & Foreshock:
      • When the solar wind collides with Earth’s magnetosphere, it forms a shock wave.
      • The foreshock region ahead of this wave is highly turbulent, enabling efficient electron acceleration.

    PYQ:

    [2009] In the year 2008, which one of the following conducted a complex scientific experiment in which sub-atomic particles were accelerated to nearly the speed of light?

    (a) European Space Agency

    (b) European Organization for Nuclear Research (CERN)

    (c) National Aeronautics and Space Administration (NASA)

    (d) National Academy of Sciences, USA

     

  • India second-largest arms importer after Ukraine

    Why in the News?

    India remained the second-largest arms importer, despite a 9.3% decline in imports between 2015-19 and 2020-24 a/c to the Stockholm International Peace Research Institute (SIPRI) Report.

    About SIPRI

    • The SIPRI is an independent organization established in 1966, based in Stockholm, Sweden, conducting research on conflict, arms control, and disarmament.
    • SIPRI provides comprehensive data on global arms imports, exports, and military expenditures, tracking defense trends and geopolitical conflicts worldwide.
    • It analyzes ongoing wars, nuclear proliferation, cybersecurity threats, and environmental security, offering policy recommendations for international peace and stability.
    • SIPRI publishes flagship reports such as the SIPRI Yearbook, Arms Transfers Database, and Military Expenditure Database, which are widely used by governments, researchers, and policymakers.

    India’s Arms Imports: Trends and Shifts

    • India remained the world’s second-largest arms importer, despite a 9.3% decline in imports from 2015-19 to 2020-24.
    • Russia accounted for 36% of India’s arms imports in 2020-24, significantly LOWER than 55% in 2015-19 and 72% in 2010-14.
    • India has reduced dependence on Russia and increased arms deals with France, the U.S., and Israel.
    • India became France’s largest arms importer (28%), with 36 Rafale fighter jets and six Scorpene submarines already contracted.
    • India is finalizing agreements for 26 Rafale-M jets and three additional Scorpene submarines.

    Global Arms Trade Highlights

    • Ukraine – The Largest Importer: Due to the ongoing war, Ukraine’s arms imports surged nearly 100 times in 2020-24 compared to 2015-19.
      • The U.S. accounted for 45% of Ukraine’s imports, followed by Germany (12%) and Poland (11%).
    • U.S. dominance in exports: The U.S. expanded its global arms market share to 43%, reinforcing its position as the top exporter.
    • Russia’s decline: Russian arms exports fell by 64%, dropping to 7.8% of global exports, behind France (9.6%).
    • European rearmament: European arms imports surged by 155% in response to rising security threats from Russia.
    • Pakistan’s growing imports: Pakistan’s arms imports grew by 61%, with China supplying 81% of its weapons, up from 74% in 2015-19.
    • China’s self-reliance: For the first time since 1990-94, China dropped out of the top 10 arms importers, reflecting its expanding domestic defense industry.
    • Italy’s rise in arms exports: Italy climbed from 10th to 6th place, with a 4.8% share of global arms exports.

    PYQ:

    [2020] What is the significance of Indo-US defence deals over Indo-Russian defence deals? Discuss with reference to stability in the Indo-Pacific region.

     

  • Preventive Detention is a ‘Draconian’ measure: SC

    Why in the News?

    The Supreme Court recently ruled against the Preventive Detention of a couple in Nagaland, emphasizing that constitutional safeguards must be strictly followed, and preventive detention cannot override fundamental rights.

    Court’s Key Observations: Preventive Detention as a ‘Draconian Measure’

    • Violation of Rights: The court ruled that depriving individuals of liberty without trial requires strict adherence to legal safeguards.
    • Lack of Justification: Authorities failed to prove that the detainees posed a credible future threat, rendering the detention unjustified.
    • Language Barrier: Detention orders were in English, a language the detainees did not understand, violating their right to be informed in an accessible manner.

    What is Preventive Detention?

    • Preventive detention is the detention of an individual without trial to prevent them from engaging in activities that may threaten national security, public order, or foreign relations.
    • Unlike punitive detention, it aims to prevent future crimes rather than punish past offenses.
    • Under Article 22 of the Constitution, preventive detention is allowed but with safeguards:
      • Time Limit: Maximum three months, extendable only if an Advisory Board (comprising High Court judges) approves.
      • Rights of the Detainee: Must be informed of reasons for detention (unless against public interest) and given the right to challenge it.
      • Judicial Review: Courts can strike down unjustified detentions.
    • Major Preventive Detention Laws:
      • Public Safety Act (PSA), 1978: Used in J&K; detention up to two years.
      • National Security Act (NSA), 1980: Up to one year for threats to national security.
      • Prevention of Illicit Traffic in Narcotic Drugs and Psychotropic Substances Act (PITNDPS Act), 1988: For drug trafficking cases.
      • Conservation of Foreign Exchange and Prevention of Smuggling Activities Act (COFEPOSA), 1974: For economic offenses & smuggling.

    Supreme Court’s Landmark Rulings

    • Ameena Begum Case (2023): Preventive detention is an exception, not a routine measure.
    • Ankul Chandra Pradhan Case (1997): It aims to prevent threats, not punish individuals.
    • Harikisan vs Maharashtra (1962): Detention orders must be in a language the detainee understands.
    • Gold Smuggling Case (2024): Authorities must consider bail conditions before imposing detention.

    PYQ:

    [2021] With reference to India, consider the following statements:

    1. Judicial custody means an accused is in the custody of the concerned magistrate and such an accused is locked up in a police station, not in jail.
    2. During judicial custody, the police officer in charge of the case is not allowed to interrogate the suspect without the approval of the court.

    Which of the statements given above is/are correct?

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

     

  • Exercise Khanjar-XII

    Why in the News?

    The 12th edition of the India-Kyrgyzstan Joint Special Forces Exercise KHANJAR-XII is set to be held in Kyrgyzstan.

    About Exercise KHANJAR-XII

    • KHANJAR-XII is the 12th edition of the India-Kyrgyzstan Joint Special Forces Exercise, aimed at enhancing counter-terrorism and special operations capabilities.
    • It is a bilateral military exercise held annually since 2011, alternately hosted by India and Kyrgyzstan.
    • The 2025 edition is being conducted in Kyrgyzstan.
    • Participants:
      • Indian Contingent: Parachute Regiment (Special Forces).
      • Kyrgyzstan Contingent: Kyrgyz Scorpion Brigade.
    • The primary objective is to strengthen military cooperation, improve joint operational capabilities, and enhance interoperability between the two nations’ Special Forces.

    Key Features:

    • Counter-Terrorism Focus: Training in urban and high-altitude warfare to counter modern security threats.
    • Special Forces Interoperability: Strengthening coordination in joint military operations.
    • Mountain Warfare & Survival Skills: Enhancing operational effectiveness in challenging terrains.
    • Military Technology Exchange: Sharing expertise on weapons systems, surveillance, and intelligence gathering.
    • Reinforcing India’s Central Asia Outreach: Strengthening India’s engagement with Central Asian nations under its Connect Central Asia policy.

  • What is Minimum Dietary Diversity (MDD) Indicator?

    Why in the News?

    The United Nations Statistical Commission has introduced a new global indicator on Minimum Dietary Diversity (MDD) to monitor progress towards Sustainable Development Goal (SDG) 2: Zero Hunger.

    About Minimum Dietary Diversity (MDD) Indicator 

    • The MDD indicator measures whether individuals consume a variety of foods within a 24-hour period to assess dietary quality.
    • It tracks progress toward Sustainable Development Goal 2 (Zero Hunger) and helps identify micronutrient deficiencies in populations.
    • It was adopted by the United Nations Statistical Commission at its 56th session (March 4-7, 2025, New York) and developed by Switzerland, FAO, UNICEF, and WHO.
    • The indicator records whether an individual has consumed at least 5 out of 10 food groups in the last 24 hours.
    • It is measured for children (6-23 months old) and women of reproductive age (15-49 years) to ensure adequate nutrition.
    • 10 Food Groups: It monitors intake from grains, white roots and tubers, pulses, nuts and seeds, milk products, meat, poultry and fish, eggs, dark green leafy vegetables, vitamin A-rich fruits and vegetables, and other vegetables and fruits.
    • Significance:
      • It addresses hidden hunger, malnutrition, and non-communicable diseases by promoting nutrient-rich diets.
      • The indicator strengthens long-term diet monitoring and ensures dietary diversity remains a global priority beyond 2030.

    SDG 2: Zero Hunger – The Larger Goal

    • Adopted in 2015, SDG 2 aims to eliminate hunger and promote sustainable agriculture.
    • Recognizes interconnections between food security, rural development, and nutrition.
    • Hunger remains a global crisis:
      • 757 million people faced hunger in 2023 (nearly 10% of the world population).
      • One in nine people worldwide sleeps hungry each night.
      • 20 million people are at immediate risk of famine in South Sudan, Somalia, Yemen, and Nigeria.

     

    PYQ:

    [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:

    (a) 1 only

    (b) 2 and 3 only

    (c) 1, 2 and 3

    (d) 1 and 3 only

     

  • World Spice Organisation (WSO)

    Why in the News?

    Despite being the largest producer and exporter of spices in the world, India’s share in the global seasoning market remains only 0.7%, compared to China’s 12% and the USA’s 11%, according to the World Spice Organisation (WSO).

    About the World Spice Organisation (WSO)

    • WSO was established in 2011 in Kochi, Kerala, India’s spice capital.
    • It is registered as a Not-for-Profit organization under the Travancore Cochin Literary, Scientific, and Charitable Societies Act, 1956.
    • It works towards food safety, sustainability, and market development for the spice industry.
    • It engages with farmers, processors, industry leaders, academia, and global spice associations.
    • It works with organizations like Spices Board India, Rainforest Alliance, GIZ (Germany), and IDH (Netherlands).
    • Partners with global spice trade bodies like:
      • American Spice Trade Association (ASTA)
      • European Spice Association (ESA)
      • International Pepper Community (IPC)
    • Participates in national and international food safety regulations, including:
      • FSSAI (India’s food safety authority)
      • BIS (Bureau of Indian Standards)
      • ISO (International Standards Organization)
      • Codex Alimentarius (Global food safety standards)
    • It serves as the technical partner for the All India Spices Exporters Forum (AISEF).

    Present Scenario of Spices  

    • India currently exports 1.5 million tonnes of spices worth $4.5 billion, accounting for one-fourth of the $20 billion global spice market. However, only 48% of these exports are value-added products, with the rest being whole spices.
    • 85% of India’s spices are consumed domestically, leaving limited surplus for exports.
    • Countries like Vietnam, Indonesia, Brazil, and China are emerging as strong competitors in the spice trade.
    • Production:
      • Major producing states: Madhya Pradesh, Rajasthan, Gujarat, Andhra Pradesh, Telangana, Karnataka, Maharashtra, Assam, Orissa, Uttar Pradesh, West Bengal, Tamil Nadu, and Kerala.
      • During 2022-23, the export of spices from India stood at US$ 3.73 billion, up from US$ 3.46 billion in 2021-22.
      • India produces about 75 of the 109 varieties listed by the International Organization for Standardization (ISO).
    • Major Produced and Exported Spices by India:
      • Pepper, cardamom, chili, ginger, turmeric, coriander, cumin, celery, fennel, fenugreek, garlic, nutmeg & mace, curry powder, spice oils, and oleoresins.
      • Out of these spices, chili, cumin, turmeric, ginger, and coriander make up about 76% of the total production.
      • Chilli is the leading export earner, generating $1.1 billion annually.
      • Ginger exports have a compound annual growth rate (CAGR) of 27%.
    • Export:
      • In 2023-24, India’s spice exports totalled $4.25 billion, accounting for a 12% share of the global spice exports (till February 2024 data).
      • India exported spices and spice products to 159 destinations worldwide as of 2023-24. The top destinations were China, the USA, Bangladesh, the UAE, Thailand, Malaysia, Indonesia, the UK, and Sri Lanka. These countries accounted for more than 70% of total exports.

     

    PYQ:

    [2019] Among the agricultural commodities imported by India, which one of the following accounts for the highest imports in terms of value in the last five years?

    (a) Spices

    (b) Fresh fruits

    (c) Pulses

    (d) Vegetable oils

     

  • ‘Brahmastra’ Missile

    Why in the News?

    Indian scientists have achieved a breakthrough in hypersonic missile technology, developing a modern-day ‘Brahmastra’ with an astonishing speed of 12,144 km per hour (Mach 10).

    'Brahmastra' Missile

    About Brahmastra (Long Range Anti-Ship Missile – LRAShM): 

    • Brahmastra is a state-of-the-art hypersonic glide missile developed by the Defence Research and Development Organisation (DRDO).
    • It is designed to neutralize enemy warships and strategic naval targets with extreme speed and precision.
    • With a speed of Mach 10 (12,144 km/h) and a range of 1,500 km, Brahmastra is one of the fastest and most lethal weapons in India’s defense arsenal.
    • The missile’s hypersonic glide vehicle technology allows it to evade enemy radar and missile defense systems, ensuring high-precision strikes on naval targets.

    Features of Brahmastra:

    • It can be launched from both land and naval platforms, enhancing India’s maritime strike capabilities.
    • Due to its hypersonic speed, Brahmastra can destroy an enemy warship within 7 to 8 minutes of launch.
    • The missile is built with advanced heat-resistant materials, preventing it from disintegrating under extreme temperatures during flight.
    • Unlike conventional missiles, Brahmastra retains its structural integrity even at hypersonic speeds, ensuring precise impact.
    • It uses scramjet propulsion and glide vehicle technology for sustained hypersonic flight.
    • It can adjust its trajectory mid-flight, making it highly maneuverable and difficult to intercept.
    • Its stealth and radar-evading capabilities ensure low detection probability, reducing the risk of interception.

    PYQ:

    [2014] Which reference to Agni-IV Missile, which of the following statements is/are correct?

    1. It is a surface-to-surface missile.

    2. It is fuelled by liquid propellant only.

    3. It can deliver one-tonne nuclear warheads about 7500 km away.

    Select the correct answer using the code given below:

    (a) 1 only

    (b) 2 and 3 only

    (c) 1 and 3 only

    (d) 1, 2 and 3

     

  • Antarctic Circumpolar Current (ACC)

    Why in the News?

    Researchers have found that the Antarctic Circumpolar Current (ACC) is slowing due to melting ice sheets. By 2050, it may weaken by 20%, affecting global climate, ocean circulation, and marine ecosystems.

    What is the Antarctic Circumpolar Current (ACC)?

    • The ACC is the strongest and largest ocean current on Earth.
    • It flows continuously from west to east around Antarctica, acting as a boundary between the Southern Ocean and the Atlantic, Pacific, and Indian Oceans.
    • It flows from west to east, driven by the westerly winds and the Coriolis effect, creating a loop that completely encircles Antarctica.
    • The ACC interacts with several regional currents, such as the Brazil Current, East Australian Current, and Agulhas Current.
    • It is influenced by both westerly winds and polar easterlies, which affect its strength and flow patterns.
    • Key features of the ACC:
      • It is five times stronger than the Gulf Stream and transports 130 million cubic meters of water per second.
      • It plays a crucial role in global heat and nutrient distribution, influencing climate patterns worldwide.
      • It prevents warmer northern waters from reaching Antarctica, helping to preserve the region’s ice sheets.
      • The ACC drives the global conveyor belt, regulating deep ocean currents and heat flow.
      • Its upwelling of nutrient-rich waters sustains Antarctic marine life, including krill, whales, and penguins.

    Why does Antarctic Ice Melt affect ACC?

    • Freshwater Dilution: Melting ice lowers salinity, weakening ocean density gradients that drive the ACC.
    • Slower Heat Exchange: Reduced current strength disrupts global heat distribution, leading to stronger storms and rising sea levels.

    Key Findings of the New Research

    A study by the University of Melbourne and NORCE Norwegian Research Centre, published in Environmental Research Letters, reveals:

    • ACC could slow by 20% by 2050 due to melting ice sheets.
    • Disrupted global climate as a weaker ACC reduces heat distribution, carbon absorption, and weather stability. 
    • Antarctic ecosystem at risk, with invasive species threatening penguins, krill, and whales.
    • Supercomputer simulations confirm that deep ocean circulation is slowing, worsening climate instability.
    • Reducing carbon emissions is crucial to prevent further ice melting and ACC weakening.

    PYQ:

    [2012] Consider the following factors:

    1. Rotation of the Earth

    2. Air pressure and wind

    3. Density of ocean water

    4. Revolution of the Earth

    Which of the above factors influence the ocean currents?

    (a) 1 and 2 only

    (b) 1, 2 and 3

    (c) 1 and 4

    (d) 2, 3 and 4

     

  • Plight of Prisoners with Disabilities needs attention SC

    Why in the News?

    The Supreme Court has acknowledged a serious issue regarding the lack of disabled-friendly infrastructure in prisons, following a petition citing the trauma and inhumane conditions faced by Professor G. Saibaba and Stan Swamy.

    A bench comprising Justices Vikram Nath and Sandeep Mehta noted that even the Persons with Disabilities Act (2016) lacks a legal framework to safeguard the rights of disabled prisoners.

    Challenges Faced by Disabled Prisoners:

    • Inaccessible Infrastructure: Most prisons lack ramps, handrails, wheelchair-accessible cells, and essential assistive devices.
    • Denial of Medical Care: Many disabled prisoners do not receive necessary medical treatment, physiotherapy, or even basic aids like hearing devices or walking supports.
    • Psychological Distress: Isolation, lack of facilities, and mistreatment lead to anxiety, depression, and deteriorating mental health among disabled prisoners.
    • Data Deficiency: No official records track the number or condition of disabled prisoners, making policy implementation difficult.

    Rights of Persons with Disabilities (in Prisons)

    • Article 14 guarantees equality before the law, ensuring that prisoners are not discriminated against based on disability.
    • Article 21 upholds the right to life and dignity, including humane treatment for prisoners.
    • Rights of Persons with Disabilities Act, 2016 mandates accessible public spaces, medical care, and assistive devices for persons with disabilities, but implementation in prisons remains inadequate.
    • Model Prison Manual, 2016 recommends disability-friendly infrastructure such as ramps and medical care provisions, yet many states have not adopted these reforms.
    • Supreme Court Judgments:
      • In Upendra Baxi vs. State of U.P. (1983), the Supreme Court reaffirmed that prisoners are entitled to humane treatment.
      • In Rama Murthy vs. State of Karnataka (1996), the Court highlighted the urgent need for prison reform, including facilities for disabled inmates.
      • The Stan Swamy Case (2021) brought attention to the denial of essential assistive tools such as straws and sippers for Parkinson’s patients.

    Past Committees on Prison Reform:

    • Mulla Committee (1983):
      • Recommended improved prison infrastructure, special provisions for disabled inmates, and measures to reduce overcrowding.
      • Suggested protection against abuse and better training for prison staff.
    • Krishna Iyer Committee (1987): Focused on the welfare of women prisoners, recommending separate facilities, healthcare, and special provisions for pregnant inmates.
    • Justice A.N. Mulla Committee (1993): Emphasized the need for humane treatment and rehabilitation, along with stricter measures against custodial torture.
    • Justice Krishna Iyer Report (2000): Called for legal aid for undertrial prisoners and mandatory inspections to monitor prison conditions.
    • Model Prison Manual (2016):
      • Provided guidelines for standardized prison reforms, including healthcare, accessibility, and rehabilitation programs.
      • Despite being issued by the Ministry of Home Affairs, many states have failed to adopt its recommendations.

    PYQ:

    [2016] Does the Rights of Persons with Disabilities Act, 2016 ensure effective mechanism for empowerment and inclusion of the intended beneficiaries in the society? Discuss.

     

  • ‘AI Kosha’ Platform

    Why in the News?

    The Union Government has launched AI Kosha, a platform dedicated to non-personal datasets, marking a major step in India’s AI research and development efforts.

    What is AI Kosha?

    • AI Kosha is a government-backed platform for non-personal datasets to support Artificial Intelligence (AI) R&D in India.
    • It serves as a centralized repository of structured datasets aimed at training AI models, particularly for Indian languages.
    • The platform is a key part of the IndiaAI Datasets Platform, one of the seven pillars of the ₹10,370 crore IndiaAI Mission, which aims to democratize AI access and innovation.
    • At launch, it hosts 316 datasets, with a significant portion focused on language translation tools for Indian languages.
    • The government has commissioned 14,000 GPUs for AI research, up from 10,000 earlier this year.
    • More computing power will be added quarterly to support advanced AI research and training.

    Key Features of AI Kosha:

    • AI Kosha aims to support India’s first foundational AI model, similar to China’s DeepSeek.
    • Works alongside the Open Governance Data Platform (data.gov.in), which already hosts 12,000 datasets from various government agencies.
    • Focuses on Indian languages, ensuring regional language AI development.
    • Includes health records, satellite imagery, Census 2011 data, meteorological and pollution data.
    • Supports AI development with access to high-performance computing (HPC) resources.
    • Equipped with secure API access, data encryption, and real-time filtering for data protection.