💥UPSC 2027,2028 Mentorship (April Batch) + Access XFactor Notes & Microthemes PDF

Type: Prelims Only

  • AYUSH – Indian Medicine System

    Sowa-Rigpa Traditional Medicine

    Why in the News?

    A one-day Samyoga event was organised today at the National Institute of Sowa-Rigpa (NISR), Leh, with the participation of experts from 10 states of India.

    About Sowa-Rigpa:

    • Overview: Sowa-Rigpa, also known as Traditional Tibetan Medicine or the Amchi system, is among the oldest continuously practised medical systems in the world.
    • Origin: The term comes from the Bhoti language, meaning “knowledge of healing”, and dates back over 2,000 years.
    • Historical Development: It was codified in the 8th century CE during King Trisong Detsen’s reign and further developed in the 12th century.
    • Foundational Text: The Gyud-Zi (4 Tantras) integrates ideas from Ayurveda, Chinese medicine, Greek traditions, and Bon and Buddhist philosophy.
    • Global Presence: Sowa-Rigpa is practiced in Tibet, Mongolia, Bhutan, Nepal, and parts of Russia and China.
    • Indian Regions: In India, it is common in Ladakh, Sikkim, Arunachal Pradesh, Himachal Pradesh (Lahaul & Spiti), Jammu & Kashmir, and Darjeeling.
    • Core Beliefs: The system promotes disease prevention, longevity, and holistic mind-body well-being, viewing the body as a microcosm of nature in harmony with the environment.

    Diagnosis and Treatment:

    • Diagnostic Methods: Practitioners use pulse analysis, urine analysis, and detailed observation including case history.
    • Therapies Used: Treatments include diet and lifestyle adjustments, herbal medicines, Kunyé massage, moxibustion, acupuncture, and spiritual healing.
    • Ayurvedic Influence: About 75% of its theoretical base is derived from Ayurveda, especially the Ashtanga Hridaya.
    • Common Herbs: Shared medicinal herbs include Ashwagandha, Triphala, and Guggulu.

    Education and Recognition:

    • Traditional Training: Knowledge was historically passed through oral traditions, via guru-shishya parampara or family lineages.
    • Modern Institutions: The Central Council for Tibetan Medicine oversees education and practice standards.
    • National Institute: The National Institute of Sowa-Rigpa (NISR) in Leh leads in education, research, and policy implementation.
    • Government Recognition: Sowa-Rigpa has been officially recognised under AYUSH systems in India since 2010 and is promoted in multiple Himalayan states.
    [UPSC 2019] Recently, there was a growing awareness in our country about the importance of Himalayan nettle (Girardinia diversifolia) because it is found to be a sustainable source of:

    Options: (a) anti-malarial drug* (b) biodiesel (c) pulp for paper industry (d) textile fibre

     

  • Climate Change Impact on India and World – International Reports, Key Observations, etc.

    Ocean Darkening: A New Ecological Crisis

    Why in the News?

    A new study from the University of Plymouth has revealed that over 21% of the global ocean has significantly darkened in the last two decades.

    What is Ocean Darkening?

    • Ocean darkening refers to the reduction in sunlight penetration into the ocean’s upper layers, known as the photic zone (up to 200 meters deep), where sunlight drives photosynthesis and supports marine biodiversity.
    • This process is measured using the diffuse attenuation coefficient (Kd 490), which tracks how quickly light diminishes as it passes through seawater.
    • The photic zone is essential for phytoplankton productivity, oxygen generation, marine food chains, and the regulation of global climate.

    Recent Report Citing Ocean Darkening:

    • A new study by researchers from the University of Plymouth, published in 2024, titled “Darkening of the Global Ocean”, revealed that 21% of the global ocean has significantly darkened from 2003 to 2022.
    • Key findings:
      • 9% of the ocean saw a drop of more than 50 meters in light penetration—equal to the area of Africa.
      • 2.6% experienced a loss exceeding 100 meters in photic depth.
    • Affected Region: The study found the Arctic, Antarctic, Gulf Stream, and North Sea among the worst affected regions.
    • Causes:
      • Algal blooms from nutrient runoff in coastal areas.
      • Warming seas, altered plankton dynamics, and changing ocean currents in open ocean zones.

    Implications of Ocean Darkening:

    • Ecosystem Disruption: Light-dependent species, such as Calanus copepods, are being pushed into shallower zones, increasing predation and competition.
    • Loss of Habitat: The shrinkage of the photic zone could be one of the largest marine habitat losses ever, affecting fish stocks and biodiversity.
    • Climate Feedback Loop: Reduced photosynthesis in oceans could weaken the ocean’s role in carbon sequestration and oxygen production, worsening climate change.
    • Threat to Global Fisheries: The contraction of productive zones affects fish populations, jeopardising fisheries and food security.
    • Scientific Concern: Researchers warn that this hidden crisis could fundamentally alter marine ecosystems if not urgently addressed.
    [UPSC 2025] With reference to the planet Earth, consider the following statements:

    I. Rain forests produce more oxygen than that produced by oceans. II. Marine phytoplankton and photosynthetic bacteria produce about 50% of the world’s oxygen. III. Well-oxygenated surface water contains several folds higher oxygen than that in atmospheric air.

    Which of the statements given above is/are correct?

    Options: (a) I and II (b) II only * (c) I and III (d) None of the above statements is correct

     

  • Make in India: Challenges & Prospects

    Rudrastra UAV passes key army trial. 

    Why in the News?

    India advanced its indigenous defence tech with SDAL’s successful trial of the Hybrid VTOL UAV Rudrastra at Pokhran.

    Rudrastra UAV passes key army trial. 

    About Rudrastra:

    • Rudrastra is an indigenously developed Hybrid Vertical Take-Off and Landing (VTOL) UAV built by Solar Defence and Aerospace Limited (SDAL).
    • The UAV is engineered for deep-strike capabilities, capable of carrying out precision missions without endangering human soldiers.
    • It is tailored for anti-personnel roles, with airburst munitions designed to strike targets across hostile borders.
    • Rudrastra blends rotor-based vertical lift with fixed-wing cruise capability, enhancing deployment across diverse terrains.
    • It is considered a “stand-off” weapon, enabling missions deep into enemy territory with autonomous return capability.

    Key Features:

    • Hybrid VTOL Design: Can vertically take off and land like a helicopter and cruise like a fixed-wing aircraft, enhancing flexibility.
    • Extended Range: Demonstrated a total mission range of over 170 km, including loiter time over the target.
    • Real-Time Surveillance: Maintained a stable video link while covering a 50+ km mission radius.
    • Precision Strike Capability: Successfully deployed airburst munitions, effective for area damage and anti-personnel use.
    • Endurance: Achieved a flight endurance of 1.5 hours, ideal for extended ISR or strike operations.
    • Autonomous Navigation: Returned independently to the launch site after completing the mission.
    • Made in India: Fully developed by an Indian defence company, supporting indigenous innovation in combat drones.
    [UPSC 2025] With reference to Unmanned Aerial Vehicles (UAVs), consider the following statements:

    I. All types of UAVs can do vertical landing. II. All types of UAVs can do automated hovering. III. All types of UAVs can use battery only as a source of power supply.

    Which of the statements given above are correct?

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

     

  • Global Geological And Climatic Events

    Green Arabia Hypothesis in Human Evolution Research

    Why in the News?

    A recent study confirms that Arabia wasn’t always a desert wall but occasionally a green bridge between continents.

    About the Green Arabia Hypothesis:

    • Core Idea: It suggests that the Arabian Peninsula, now one of the driest places on Earth, experienced multiple humid phases over the past 8 million years, turning it into a green corridor for early migrations.
    • Challenge to Old Views: This theory challenges traditional models that excluded Arabia from early human dispersal routes in the ‘Out of Africa’ narrative.
    • Fossil Evidence: The discovery of fossils of crocodiles, hippos, and horses, dating up to 74,000 years ago, supports the claim that Arabia was once lush and habitable.

    Key Discoveries and Methods:

    • Archaeological Sites: Over 10,000 ancient lakebeds and sites over 500,000 years old were found, confirming Arabia’s role as a migration bridge between Africa and Eurasia.
    • Speleothem Analysis: 22 speleothem samples (mineral deposits formed within caves) from seven Saudi caves indicated humid phases between 7.44 million and 60,000 years ago.
    • Dating Techniques: Scientists used uranium-thorium dating to accurately time wet periods, revealing patterns linked to monsoon shifts and glacial cycles.
    • Environmental Impact: These wet intervals, though brief, supported vegetation, biodiversity, and water bodies, enabling human and animal settlements.

    Significance of the Study:

    • Biogeographic Role: Arabia is now viewed as a climate-sensitive migratory bridge, not a barrier, in human evolution and dispersal.
    • Climate Dependency: Human movement was influenced not just by geography, but by shifts in rainfall patterns and monsoonal activity.
    • Key Locations: Sites like Jubbah Oasis provided stone tools and lakebed evidence, validating early human habitation in the region.
    • Conclusion: Arabia’s periodic greening played a decisive role in early human migration, revising our understanding of ancient dispersal pathways out of Africa.
    [UPSC 2014] Which of the following phenomena might have influenced the evolution of organisms?

    1. Continental drift

    2. Glacial cycles Select the correct answer using the code given below.

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

     

  • Port Infrastructure and Shipping Industry – Sagarmala Project, SDC, CEZ, etc.

    Fire on waters India’s maritime firefighting capabilities are standing up to the test

    Why in the News?

    The fire on MV Wan Hai 503 near Kannur exposed India’s weak maritime safety. With over 140 hazardous containers onboard, it posed a major risk during the monsoon, threatening the environment and lives.

    What are the major types of peacetime maritime accidents faced by the Indian coast?

    • Sinking of merchant ships – leads to cargo loss, traffic disruption, and environmental damage.
    • Fire onboard vessels – threatens coastal life, property, and marine ecology.
    • Oil spills – have long-lasting environmental impacts and are difficult to contain.

    Why was the MV Wan Hai 503 incident a significant maritime safety challenge?

    • Presence of Hazardous Cargo: Over 140 of the 1,754 containers onboard contained hazardous materials, posing a high risk of toxic release and chemical explosions. Eg: Multiple colors of smoke (brown, white, grey, black) indicated different substances burning simultaneously.
    • Proximity to Coastline During Fire: The ship began drifting dangerously toward the Indian coast near Azhikkal, Kerala, during monsoon rough seas, increasing the threat of coastal disaster. Eg: The tow rope initially snapped under pressure, risking further drift and collision with the shore.
    • Complexity of Fire-Fighting and Towing: Fire-fighting was complicated by weather conditions and ship instability, requiring precise coordination. Eg: An Indian Navy helicopter had to airdrop a salvage team to pass a steel wire rope for safe towing to deeper waters.
    • Multi-Agency Emergency Response Needed: The incident required rapid coordination between the Indian Navy, Coast Guard, and the ship owner’s team using tugs. Eg: The ship was finally stabilized 45 nautical miles offshore, where the water depth was nearly one kilometre, minimizing risk to coastal areas.

    How did Indian agencies respond to the fire on MV Wan Hai 503?

    • Rapid firefighting efforts amid adverse conditions: The Indian Coast Guard initiated firefighting operations despite rough seas caused by the monsoon. Eg: Firefighting continued while the ship drifted dangerously toward the Kerala coast, with thick smoke from burning hazardous cargo.
    • Coordinated aerial and naval action: The Indian Navy deployed a helicopter to airdrop a salvage team onto the ship and deliver a steel wire rope to secure it. Eg: The steel rope enabled safe towing after the initial tow rope snapped due to tension and sea conditions.
    • Strategic towing and risk mitigation: Indian agencies, in coordination with the ship owner’s agents and tugboats, towed the vessel 45 nautical milesaway from the coast to prevent environmental and coastal damage. Eg: The vessel was moved to deeper waters (1 km depth) to minimize the impact of any further explosion or sinking.

    Why are gas-carrying and oil-laden ships considered severe fire and explosion hazards?

    • High flammability of cargo: Gas and crude oil are highly combustible, making these ships extremely prone to fires and explosions if containment fails. Eg: Even a minor spark can ignite vapours from gas or oil, causing catastrophic fires onboard.
    • Large volume of hazardous material: These vessels carry enormous quantities of flammable substances, which amplify the scale of damage during accidents. Eg: The New Diamond VLCC was carrying 2,70,000 tonnes of crude oil when it caught fire off Colombo in 2020.
    • Critical maritime chokepoint risks: Accidents involving such vessels at strategic locations like the Suez Canal or Strait of Malacca can disrupt global trade and cause widespread damage. Eg: A gas carrier explosion at a maritime chokepoint could halt international shipping routes, impacting global supply chains.

    What are the key areas India needs to strengthen in maritime fire-fighting and salvage operations? (Way forward)

    • Rapid Salvage Capability: India must improve its ability for quick salvage of sinking or damaged vessels to prevent cargo loss, environmental damage, and navigation disruption. Eg: During the MV Wan Hai 503 incident, timely towing by the Indian Navy helped avert a coastal disaster, but highlighted the need for faster salvage deployment.
    • Multi-agency Coordination: Effective response to maritime emergencies requires seamless coordination among the Coast Guard, Navy, port authorities, and private salvage firms. Eg: The successful control of the New Diamond VLCC fire involved joint efforts from Indian and Sri Lankan naval forces.
    • Advanced Fire-fighting Infrastructure: India needs to upgrade fire-fighting equipment on patrol vessels and at key ports, especially for handling hazardous cargo and oil/gas fires. Eg: The Coast Guard’s patrol vessels are now fitted with basic fire-fighting systems, but large-scale fires require specialised ships and foam-based suppression systems.

    Mains PYQ:

    [UPSC 2023] What are the ways in which oil pollution affects the marine ecosystem? In what way is oil pollution particularly harmful for a country like India?

    Linkage: Maritime Accident Response” explicitly talks about the “oil spills” as one of the three major peacetime maritime accidents that the Indian coast needs protection against. It also states that oil is a “more severe fire hazard” than hazardous cargo, especially in the context of gas-carrying merchant ships. This question directly addresses the environmental and national impact of oil pollution, which is a significant aspect of maritime accidents and firefighting efforts.

  • Capital Markets: Challenges and Developments

    What are Passively Managed Funds?

    Why in the News?

    Passively Managed Funds—those that track a market index without active stock selection—have become increasingly popular among investors seeking low-cost, predictable returns.

    About Passively Managed Funds:

    • Passively managed funds, commonly known as passive funds, are investment vehicles designed to replicate the performance of a specific market index, such as the Nifty Fifty or the Sensex.
    • Unlike actively managed funds, the fund manager in a passive fund does not select stocks or make frequent buy-and-sell decisions.
    • Instead, the fund holds the same stocks in the same proportion as the underlying index.
    • How Passive Funds Work?
      • These funds track a benchmark index by investing in all or a representative sample of the securities in that index.
      • The objective is to mirror the index’s returns, not to outperform it.
      • As a result, they incur lower management costs and have minimal portfolio turnover.

    Types of Passive Funds:

    1. Index Funds:
      • These are mutual funds that can be purchased or redeemed directly from the fund house.
      • Transactions are processed only once a day, based on the day’s closing Net Asset Value.
      • They offer ease of use and are suitable for systematic investment plans and long-term investors.
    1. Exchange Traded Funds:
      • These are funds listed on stock exchanges, like the National Stock Exchange or the Bombay Stock Exchange.
      • Investors buy or sell units during trading hours through brokers, just like stocks.
      • They require a dematerialised account and are suitable for investors seeking intraday trading flexibility.

    Advantages of Passive Funds:

    • Low Expense Ratios: Because no active research or trading is involved.
    • Transparency: Holdings closely follow a well-known index.
    • Diversification: Spreads investment risk across multiple securities.
    • No Human Bias: Avoids mistakes due to the fund manager’s poor decisions.

    Limitations:

    • No Outperformance: Returns will always be close to the index and cannot exceed it.
    • Tracking Error: Slight variation between the fund’s performance and the index due to operational reasons.
    • Limited Flexibility: Cannot adapt to sudden market downturns.
    [UPSC 2025] Consider the following statements:

    Statement I: As regards returns from an investment in a company, generally, bondholders are considered to be relatively at lower risk than stockholders.

    Statement II: Bondholders are lenders to a company, whereas stockholders are its owners.

    Statement III: For repayment purposes, bondholders are prioritised over stockholders by a company.

    Which one of the following is correct in respect of the above statements?

    (a) Both Statement II and Statement III are correct, and both of them explain Statement I *

    (b) Both Statement I and Statement II are correct, and Statement I explains Statement II

    (c) Only one of the Statements II and III is correct and that explains Statement I

    (d) Neither Statement II nor Statement III is correct

     

  • New Species of Plants and Animals Discovered

    Spartaeus karigiri: New jumping Spider Species discovered in Karnataka

    Why in the News?

    Researchers from Chennai have discovered a new species of jumping spider, ‘Spartaeus karigiri’, belonging to the Spartaeinae subfamily.

    About the Spartaeus karigiri :

    • Spartaeus karigiri is a newly discovered species of jumping spider, part of the Spartaeinae subfamily within the Salticidae (jumping spider) family.
    • It was first identified in the Karigiri (Elephant Hill) region of Devarayanadurga, Karnataka, and is named after this location.
    • The species marks the first recorded instance of the Spartaeus genus being found in India, extending its previously known range from Southeast Asia.
    • Field specimens were also collected from Villupuram district in Tamil Nadu, suggesting a broader habitat.

    Key Features:

    • Genus Identification: Belongs to the Spartaeus genus, known for its intelligent predation and visual hunting tactics.
    • Habitat: Found in rocky outcrops and forested terrain; prefers crevices and protected microhabitats.
    • Hunting Behaviour: Likely exhibits web-invasion hunting methods and prey mimicry, similar to other Spartaeinae members.
    [UPSC 2025] Regarding the Peacock tarantula (Gooty tarantula), consider the following statements:

    I. It is an omnivorous crustacean.

    II. Its natural habitat in India is only limited to some forest areas.

    III. In its natural habitat, it is an arboreal species.

    Which of the statements given above is/are correct?

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

     

  • Innovations in Biotechnology and Medical Sciences

    How DNA identification works?

    Why in the News?

    Following the tragic crash of the Air India Boeing 787 Dreamliner in Ahmedabad, authorities concluded the identities of the victims using DNA analysis.

    What is DNA?

    • Overview: DNA (Deoxyribonucleic Acid) is the molecule that carries genetic instructions essential for the development, growth, and reproduction of all living organisms.
    • Location in the Body: It is present in nearly every human cell and is unique to each person, except for identical twins.
    • Structure: DNA is made up of four chemical bases—Adenine (A), Cytosine (C), Guanine (G), and Thymine (T)—arranged in sequences that encode genetic data.
    • Biological Fingerprint: Due to its individual uniqueness, DNA acts like a biological fingerprint, useful in crime investigations and disaster victim identification.

    How DNA Identification Works?

    • Use in Forensics: DNA is extracted from human remains when visual identification is not possible due to burns, decomposition, or trauma.
    • Reference Matching: Extracted DNA is compared with:
      • Family reference samples (from parents, children, siblings)
      • Personal belongings (like a toothbrush, razor, or hairbrush)
    • Sample Reliability: Bones and teeth are preferred in degraded conditions, as they preserve DNA more effectively.
    • Forensic Accuracy: Specialized forensic labs analyze and match DNA sequences, confirming identity with high levels of accuracy.

    Common DNA Analysis Methods:

    1. Short Tandem Repeat (STR) Analysis:
      • Focuses on short, repeating sequences of DNA that vary among individuals.
      • Requires nuclear DNA, typically from well-preserved samples.
      • Considered the gold standard for forensic identification.
    1. Mitochondrial DNA (mtDNA) Analysis:
      • Extracts DNA from mitochondria, not the nucleus, making it more resilient in degraded samples.
      • Inherited only from the mother, allowing tracing through the maternal lineage.
    1. Y-Chromosome Analysis:
      • Targets Y chromosomes, passed from father to son.
      • Useful for identifying male victims when paternal relatives are available.
    1. Single Nucleotide Polymorphism (SNP) Analysis:
      • Detects single-letter changes in the DNA sequence.
      • Applied when DNA is highly degraded and other methods are less effective.
      • Can be used with reference items like personal hygiene tools.
    [UPSC 2000] Assertion (A): DNA Finger-printing” has become a powerful tool to establish paternity and identity of criminals in rape and assault cases. Reason (R): Trace evidence such as hairs, saliva and dried semen are adequate for DNA analysis.

    Options: (a) Both A and R are true, and R is the correct explanation of A (b) Both A and R are true, but R is not a correct explanation of A (c) A is true, but R is false (d) A is false, but R is true

     

  • Tourism Sector

    Shipki La Mountain Pass opened for Tourists

    Why in the News?

    For the first time since India’s independence, the Shipki La pass in Himachal Pradesh has been opened to domestic tourists, marking a historic shift in India’s border tourism strategy.

    About Shipki La Pass:

    • It is a high-altitude mountain pass at 3,930 meters in the Kinnaur district of Himachal Pradesh, on the India–Tibet (China) border.
    • It is one of only 3 official border trading points between India and Tibet, along with Nathu La (Sikkim) and Lipulekh (Uttarakhand).
    • The Sutlej River (called Langqen Zangbo in Tibet) enters India near Shipki La, adding geographical importance to the area.
    • The pass lies along National Highway 5 (NH5) and is considered one of the highest motorable roads in India.
    • Historically, it served as a major trade route, enabling exchange of salt, wool, spices, yak tails, and tea between India and Tibet.
    • Trade was stopped in 1962 after the India-China war, resumed in 1992, but was halted again during COVID-19.
    • On June 9, 2025, Himachal Pradesh opened the pass to Indian tourists for the first time since Independence.
    • The initiative is part of a “Border Tourism” strategy, which includes the launch of the Sarhad Van Udyan (Border Forest Park).
    • It is also being considered as an alternate route for the Kailash Mansarovar Yatra.

    Other Important Himalayan Passes:

    • Ladakh and Jammu & Kashmir:
      • Khardung La (5,359 m) – Among the highest motorable passes; connects Leh with Nubra Valley.
      • Zoji La – Links Srinagar with Leh; vital for year-round Ladakh access.
      • Chang La, Baralacha La, Umling La (5,798 m) – Crucial for Leh connectivity and defense.
      • Rezang La – Famous for the 1962 India-China war battle.
      • Karakoram Pass, Aghil Pass, Demchok Pass – Strategic India-China border passes.
    • Himachal Pradesh:
      • Rohtang Pass – Connects Kullu with Lahaul-Spiti; key for tourism and logistics.
      • Parang La – Links Spiti Valley and Parvati Valley; used by trekkers and herders.
      • Shipki La – Now open to tourists; historical Indo-Tibetan trade route.
    • Uttarakhand:
      • Lipulekh Pass (5,632 m) – Used for Kailash Mansarovar Yatra.
      • Mana Pass – One of the highest vehicle-accessible passes; connects to Tibet.
      • Niti Pass, Milam Pass, Kuthi Pass – Historical trade and pilgrimage routes.
    • Sikkim:
      • Nathu La – Major border trade route; part of the ancient Silk Route.
      • Jelep La – Historical route linking Sikkim with Lhasa via Chumbi Valley.
    • Arunachal Pradesh:
      • Se La, Bum La – Connect to Tawang and Bhutan border.
      • Pangsau Pass, Diphu Pass – Connect Arunachal with Myanmar; important for WWII history and connectivity.
    [UPSC 2007] Which one of the following Himalayan passes was reopened around in the middle of the year 2006 to facilitate trade between India and China?

    Options: (a) Chang La (b) Jara La (c) Nathu La (d) Shipki La

     

  • Innovations in Sciences, IT, Computers, Robotics and Nanotechnology

    What are Black Boxes?

    Why in the News?

    Authorities have recovered the black box from the crash site of the recent incident in Ahmedabad.

    black box

    About Black Boxes:

    • Purpose: Black boxes are essential flight data recording devices used in aircraft to aid in accident investigation and flight safety analysis.
    • Development: Australian scientist David Warren in 1954, developed the first practical FDR after investigating mid-air explosions.
    • Color and Visibility: Despite the name, black boxes are painted bright orange with reflective material to make them easily visible after a crash.
    • Two Main Types: Aircraft typically have two black boxes:
      1. Cockpit Voice Recorder (CVR) and
      2. Digital Flight Data Recorder (DFDR).
    • Single Unit: Some aircraft integrate both functions into a single combined unit.
    • How does it work?
      • Cockpit Voice Recorder (CVR): The CVR records cockpit audio, including pilot conversations, radio transmissions, alarm sounds, and background noises like engine hum or warning tones.
      • Digital Flight Data Recorder (DFDR): The DFDR logs key flight performance data, including altitude, airspeed, direction, engine parameters, and system operations, capturing thousands of data points per second.
      • Installation Location: Black boxes are usually installed in the tail section of the aircraft, as this area is statistically more likely to remain intact in a crash.
      • Recording Capacity: The CVR records the last 2 hours of cockpit audio on a continuous loop, while the DFDR stores up to 25 hours of flight data.
      • Durability and Protection: Black boxes use solid-state memory chips housed in crash-survivable casings that can endure high-impact forces, extreme temperatures (up to 1,100°C), and deep-sea pressure.
      • Underwater Locator Beacons (ULBs): Each black box includes a beacon that emits signals for up to 30 days, aiding search teams in locating the devices in the event of a water crash.

    Use of Black Boxes in India:

    • Regulation in India: In India, aircraft crash investigations are conducted by the Aircraft Accident Investigation Bureau (AAIB) under the Ministry of Civil Aviation, using black box data as primary evidence.
    • Recent Development (April 2025): India established its first dedicated Flight Recorders Laboratory in New Delhi, strengthening the country’s capability to analyze crash data independently and efficiently.
    [UPSC 2025] GPS-Aided Geo Augmented Navigation (GAGAN) uses a system of ground stations to provide necessary augmentation.  Which of the following statements is/are correct in respect of GAGAN?

    I. It is designed to provide additional accuracy and integrity.

    II. It will allow more uniform and high-quality air traffic management.

    III. It will provide benefits only in aviation but not in other modes of transportation.

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