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Subject: Science and Technology

  • Quantum 5G Fixed Wireless Access Broadband

    Why in the News?

    BSNL announced the soft launch of Quantum 5G Fixed Wireless Access (FWA) broadband in Hyderabad.

    About Quantum 5G FWA:

    • Overviews: It is India’s first SIM-less, fixed wireless access broadband service.
    • Development: It delivers fibre-like internet over 5G radio and was developed entirely by Indian vendors under the Atmanirbhar Bharat initiative.
    • How does it work?
      • Customers are provided with a CPE (Customer Premises Equipment) device that connects wirelessly to the nearest BSNL 5G base station.
      • The CPE auto-authenticates without requiring a SIM card, using Direct-to-Device technology.
      • Internet is delivered over the air, eliminating the need for trenching or fibre installation.
      • The service currently reaches 85% of Hyderabad households using BSNL’s existing tower infrastructure.

    Key Features:

    • Indigenous: Includes core network, RAN, and CPE, all developed by Indian vendors.
    • High Performance: Achieves up to 980 Mbps download, 140 Mbps upload, and <10 ms latency—ideal for streaming, gaming, and remote work.
    • Quick Setup: Customers can self-install the device with no need for physical fibre connections.
    • Enterprise Capability: Supports network slicing and Service Level Agreement (SLA)-backed links for MSMEs and industrial clusters.
    • Strategic Vision: Positions BSNL as a leader in next-generation broadband and enhances rural and urban connectivity.
    [UPSC 2019] With reference to communication technologies, what is/are the difference/differences between LTE (Long-Term Evolution) and VoLTE (Voice over Long-Term Evolution)?

    1. LTE ‘is commonly marketed as 3G, and VoLTE is commonly marketed as advanced 3G.

    2. LTE is data-only technology, and VoLTE is voice-only technology.

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

     

  • IIT-D demonstrates Quantum Communication over 1 Km

    Why in the News?

    The Defence Ministry announced a breakthrough as IIT-Delhi and DRDO scientists successfully demonstrated quantum communication over 1 km in free space.

    What is Quantum Communication?

    • It is a new way of sending messages so safely that no one can secretly listen in.
    • It uses the laws of quantum physics, especially something called quantum entanglement, to make sure that if someone tries to spy on your message, you’ll know immediately.
    • In quantum entanglement, two tiny particles (like photons of light) are connected in a mysterious way—whatever happens to one instantly affects the other, even if they’re far apart.
    • Because of this, if someone tries to distort one particle, it changes, and the system knows the message isn’t safe anymore.
    • This makes quantum communication perfect for defence, banking, and sensitive messages that must stay secret.

    Quantum Key Distribution (QKD) – Explained Simply:

    • Imagine you want to lock a box and send it to your friend, but you also want them to have the key—without anyone else being able to copy it.
    • QKD is a special way to share that key safely, using quantum particles instead of metal keys.
    • Two people use entangled particles to create the same secret key, without anyone else knowing it.
    • If someone tries to intercept the key while it’s being shared, the particles will show signs of disturbance, and the system will know to discard it and try again.
    • Once both people have the same key, they can use it to lock and unlock messages using regular encryption tools.
    • QKD doesn’t send the actual message—it just safely shares the key that keeps messages secret.

    What did the IIT-Delhi team achieve?

    • A team led by IIT-Delhi, in collaboration with DRDO, successfully demonstrated entanglement-based quantum communication over 1 km in free space.
    • This was done within the IIT-Delhi campus and marks a key advancement from previous experiments using only optical fibre.
    • The demonstration achieved a secure key rate of 240 bits per second and maintained a quantum bit error rate (QBER) of under 7%, which is considered acceptable for real-world QKD.
    • This capability is a step toward achieving satellite-to-ground quantum communication, enabling encrypted keys to be distributed across vast regions without physical links.

    India’s Quantum Communication Journey So Far:

    • In 2022, Prof. Kanseri’s team first demonstrated quantum communication between Vindhyachal and Prayagraj.
    • In 2023, they expanded this capability to 380 km using standard telecom fibre, achieving a low QBER of 1.48%.
    • By 2024, the team established a QKD link spanning over 100 km of optical fibre, further pushing the reliability and reach of India’s quantum infrastructure.
    • These achievements are part of India’s larger effort under the National Quantum Mission (2023–2031), which has a budget of ₹6,000 crore to support R&D and deployment in quantum computing, sensing, and communication.
    • India now joins an elite group of nations—alongside China and the US—actively building toward a quantum-secure internet, with potential applications in defence, finance, telecom, and cybersecurity.

     

    [UPSC 2025] Consider the following statements:

    I. It is expected that Majorana 1 chip will enable quantum computing. II. Majorana 1 chip has been introduced by Amazon Web Services (AWS). III. Deep learning is a subset of machine learning.

    Which of the statements given above are correct?

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

     

  • [20th June 2025] The Hindu Op-ed: Why India should address its propulsion gap

    PYQ Relevance:

    [UPSC 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.

    Linkage: The question regarding Indo-US and Indo-Russian defense deals is relevant because India’s propulsion gap directly influences its choices and reliance on these foreign defense partners for critical military hardware like engines. Addressing the propulsion gap would reduce this dependency, enabling India to better assert its strategic autonomy and contribute to regional stability (such as in the Indo-Pacific) without being constrained by external supply chain pressures or technology transfer limitations from other nations.

     

    Mentor’s Comment:  India’s Advanced Medium Combat Aircraft (AMCA) project is moving ahead quickly and is seen as a big step forward for the country’s aerospace sector. However, the excitement is being held back by a long-standing reliance on foreign engines. This same problem had earlier affected the HF-24 Marut and is now also troubling the LCA and AMCA fighter jet programs. Even after years of work and investment — including the unsuccessful Kaveri engine project and delays in getting engines from GE — India still depends heavily on other countries for engine technology. This not only affects military preparedness but also raises serious concerns about India’s ability to act independently in defence matters.

    Today’s editorial analyses the development of Indian fighter aircraft engines. This content would help in GS Paper II (International Relations) and GS Paper III (Science & Technology) in the mains Paper.

    _

    Let’s learn!

    Why in the News?

    Recently, there is growing excitement around India’s AMCA stealth fighter, seen as a major aerospace milestone. However, concerns remain due to a long-standing reliance on imported engines since the HF-24 Marut.

    Why has India failed to develop its own jet engine? 

    • Technological Challenges in Engine Design: Jet engines require high thrust-to-weight ratios, thermal stability, and advanced metallurgy, which India has struggled to achieve. Eg: The Kaveri GTX-35VS engine, under development since 1989 by DRDO-GTRE, failed to meet performance benchmarks in thrust and thermal management even after 3,000 hours of testing.
    • Lack of Core Materials and Manufacturing Capability: India lacks access to critical technologies like single-crystal turbine blades, thermal barrier coatings, and advanced cooling systems, essential for high-performance engines. Eg: Negotiations with GE for F414 engine hit a roadblock because GE refused full transfer of these core technologies despite India’s demand.
    • Fragmented and Short-Term Funding: Defence R&D funding in India is project-specific and often lacks a long-term strategic vision, affecting continuity and innovation in complex projects. Eg: Despite spending over ₹2,032 crore on the Kaveri project over 35 years, no operational engine was produced due to inconsistent support and shifting goals.
    • Over-Reliance on Foreign Engines: Dependence on foreign suppliers has created a complacency in indigenous R&D, slowing domestic capability-building. Eg: India continues to rely on GE F404 and F414 engines for its LCA Tejas variants, instead of pursuing an urgent push for domestic alternatives.
    • Institutional Inertia and Missed International Collaborations: Bureaucratic rigidity and institutional pride have caused India to reject key collaborative opportunities for engine co-development. Eg: A proposed joint project with Safran (France) for developing an engine for AMCA and Tejas MkII was reportedly declined by DRDO.

    What is HF-24 Marut?

    The HF-24 Marut (meaning “Spirit of the Tempest”) was India’s first indigenously designed and built fighter jet, developed in the 1950s and 1960s by Hindustan Aeronautics Limited (HAL).

    What caused the HF-24 Marut’s underperformance?

    • Underpowered Engine: The Marut was equipped with British Bristol Siddeley Orpheus 703 turbojets, which lacked the thrust needed for supersonic performance. Eg: Designer Kurt Tank had envisioned a more powerful engine, but it never materialised, severely restricting the aircraft’s speed and payload capabilities.
    • Failure to Acquire Suitable Alternatives: Despite multiple attempts, India could not procure or co-develop a more suitable engine to enhance the Marut’s performance. Eg: Efforts to source a better engine from Egypt and Germany failed, leaving the Marut stuck with the underpowered Orpheus units.
    • Operational Limitations in Combat: The aircraft performed well in ground-attack roles, such as in the 1971 war, but its overall combat effectivenesswas limited by its propulsion shortfall. Eg: Indian Air Force veterans cited that the engine limitation was the Marut’s Achilles’ heel, preventing it from evolving into a full-spectrum fighter.

    How does engine import dependency impact India’s defence?

    • Delays in Defence Production and Induction: Dependency on foreign engines leads to project delays when there are supply chain issues or export restrictions. Eg: Delivery of 99 General Electric F404 engines for the LCA Mk1A was delayed by 13 months, pushing back aircraft induction timelines.
    • Limited Operational and Strategic Autonomy: India becomes vulnerable to geopolitical pressures and foreign policy decisions of engine-supplying nations. Eg: U.S. reluctance to share core technologies like single-crystal turbine blades restricts India’s ability to upgrade or export its fighter aircraft.
    • Constraints on Defence Exports: Exporting platforms equipped with foreign engines requires third-party approvals, limiting India’s potential in global defence markets. Eg: India’s ability to export Tejas is restricted by U.S. controls on the GE F404 engine, limiting defence diplomacy options.

    What are the steps taken by the Indian Government? 

    • Strategic Collaborations for Technology Transfer: India has initiated joint ventures and international collaborations to acquire advanced propulsion technology. Eg: During PM Modi’s 2023 U.S. visit, HAL signed a deal with General Electric to co-produce GE F414 enginesin India for the LCA Mk2 and AMCA programs.
    • Revival of Indigenous Engine Projects: The government has revived and restructured efforts to develop indigenous jet engines under DRDO’s GTRE. Eg: The Kaveri engine project was decoupled from the LCA program and is being explored for use in UAVs and future aircraft with potential foreign assistance.
    • Promotion of Atmanirbhar Bharat in Defence: The Defence Ministry has prioritized self-reliance in critical technologies, including aero-engines, under the Atmanirbhar Bharat initiative. Eg: Several defence PSUs and private players have been incentivized to develop components and sub-systemsfor aerospace platforms under Make in India schemes.

    What must India do to achieve propulsion self-reliance? (Way forward)

    • Establish Strategic Global Partnerships for Technology Transfer: India must engage in joint ventures with trusted international engine manufacturers to acquire critical technologies like single-crystal turbine blades and thermal barrier coatings. Eg: The proposed GE-HAL deal to manufacture the F414 engines in India should ensure full transfer of know-how to avoid long-term dependency.
    • Develop an Integrated Indigenous R&D Ecosystem: India needs to create a cohesive framework connecting DRDO, GTRE, academia, and private industry to focus on advanced propulsion R&D with long-term investment. Eg: Encouraging private sector participation in defence through the Innovations for Defence Excellence (iDEX)platform can accelerate jet engine innovation.

     

  • Rice reveals surprise ability to adapt to cold faster than evolution 

    Why in the News?

    In a major study, scientists proved that cold exposure in rice plants can cause changes that improve stress tolerance and are inherited by the next five generations, supporting Lamarck’s old theory.

    What was Lamarck’s theory of acquired characteristics?

    This idea was formally presented by Jean-Baptiste Lamarck in 1809, and it was one of the earliest theories of evolution. When the traits developed during an organism’s lifetime due to use, disuse, or environmental influence could be inherited by its offspring. Eg: A giraffe stretching its neck to reach higher leaves would result in its offspring having longer necks.

    How did later scientific discoveries challenge it?

    • Weismann’s Tail-Cutting Experiment: August Weismann demonstrated that acquired traits are not inherited by cutting the tails of mice for five generations, yet their offspring were still born with tails.
    • Mendel’s Laws of Heredity: Gregor Mendel showed that traits are inherited through stable units (genes) passed unchanged from parents to offspring, rather than traits acquired during life. Eg: In pea plants, traits like flower colour were inherited predictably, regardless of environmental changes.
    • Discovery of DNA and Mutations: The discovery of DNA as the genetic material and that mutations cause heritable changes explained inheritance scientifically, without relying on acquired characteristics. Eg: Genetic disorders like sickle cell anemia are caused by specific DNA mutations, not by environmental use or disuse.

    How did Mendel’s work and DNA discovery change heredity understanding?

    • Introduction of Stable Hereditary Units: Mendel’s experiments introduced the concept of “genes” as stable, particulate units of inheritance passed from parents to offspring. Eg: Mendel’s pea plant experiments showed traits like seed shape and flower color followed predictable patterns.
    • Law of Segregation and Independent Assortment: Mendel proposed that alleles segregate independently, ensuring genetic variation without influence from acquired traits. Eg: A plant with one tall and one short gene could pass either to its offspring, not a mix of the two.
    • DNA Identified as Genetic Material: Later discoveries identified DNA as the carrier of genetic information, solidifying the molecular basis of heredity. Eg: Avery, MacLeod, and McCarty’s experiments in 1944 showed that DNA—not proteins—was responsible for heredity.
    • Mutation Explained Heritable Variation: The understanding that mutations in DNA cause changes in traits clarified how new heritable variations arise. Eg: Mutations in the hemoglobin gene lead to sickle cell anemia, a heritable disorder.
    • Disproved Lamarckian Inheritance: These findings rejected the idea that characteristics acquired during life could be inherited, as proposed by Lamarck. Eg: A bodybuilder’s muscular physique isn’t passed to their children genetically.

    Why is the Cell study on cold-tolerant rice significant?

    • Proof of Heritable Epigenetic Change Induced by Environment: The study demonstrated that cold exposure triggered an epigenetic modification (methylation) in rice plants, which was inherited for five generations. Eg: Rice plants exposed to cold passed on improved cold tolerance without any DNA sequence change.
    • Reinforced the Role of Epigenetics in Evolution: It showed that gene expression can be regulated by epigenetic marks rather than genetic mutations, suggesting Lamarck’s idea of environmental inheritance has merit. Eg: The ACT1 gene stayed active in cold-tolerant rice due to the absence of a methylation tag, helping them survive cold stress.
    • New Direction for Crop Improvement and Climate Resilience: The findings open doors for non-genetic crop adaptation methods to deal with climate change. Eg: Epigenetically trained rice varieties could be developed to withstand colder environments, improving food security.

    What are the steps taken by the Indian Government? 

    • Multigenerational Cold-Stress Breeding: Researchers implemented a directional selection process over multiple generations by exposing rice to cold during the vulnerable meiotic stage, breeding for improved cold resistance. Eg: After three generations, they developed rice lines with stable cold tolerance that persisted for at least five generations.
    • Epigenetic Mapping and Editing of the ACT1 Promoter: Through multi-omics analysis, scientists identified hypomethylation at the ACT1 promoter as the molecular basis for cold adaptation. They then used precision DNA methylation editing to confirm that removing methyl tags restored cold tolerance.  

    Way forward:

    • Incorporate Epigenetic Breeding in National Crop Improvement Programs: Government research bodies and agricultural universities should integrate epigenetic trait selection and editing into mainstream breeding to develop climate-resilient varieties, especially for stress-prone regions.
    • Strengthen Investment in Multi-Generational Stress Trials: Increase funding for long-term, controlled environment trials to identify and stabilize heritable epigenetic traitsacross major crops, ensuring sustainable food security under climate change.

    Mains PYQ:

    [UPSC 2019] How can biotechnology improve the living standards of farmers?

    Linkage: The core of the article reveals a novel mechanism for plant adaptation—epigenetic inheritance of cold tolerance in rice plants. This scientific breakthrough, falling under the broad umbrella of biotechnology, demonstrates a potential pathway to develop crops that can adapt to challenging environmental conditions (like cold stress) more rapidly than through traditional breeding or genetic modification.

  • What is Project Vishnu? 

    Why in the News?

    India is set to test the Extended Trajectory-Long Duration Hypersonic Cruise Missile (ET-LDHCM), an advanced hypersonic missile developed by DRDO under the secretive Project Vishnu.

    What is Project Vishnu?

    • Overview: Project Vishnu is a top-secret initiative by India’s Defence Research and Development Organisation (DRDO) to develop hypersonic missile technologies.
    • Strategic Purpose: The project aims to enhance India’s strategic deterrence by delivering high-speed missiles capable of both conventional and nuclear roles.
    • Focus: It is specifically designed to counter threats from China and Pakistan, reinforcing regional strike capability.
    • Platform Flexibility: A core feature is multi-platform deployment, allowing the missile to be launched from land, air, and naval systems.
    • Integrated Technologies: It brings together scramjet propulsion, materials science, and precision guidance into a single hypersonic weapons system.
    • Doctrinal Alignment: It reflects India’s shift toward technology-driven warfare and supports its credible minimum deterrence doctrine.

    About the ET-LDHC Hypersonic Missile:

    • Overview: It is the flagship missile system under Project Vishnu.
    • Speed and Range: It reaches Mach 8 (~11,000 km/h) and has a strike range of 1,500 km, making it nearly impossible to intercept with current defence systems.
    • Payload Versatility: It can carry 1,000–2,000 kg of conventional or nuclear warheads, allowing mission-specific configurations.
    • Propulsion: Powered by an indigenously developed scramjet engine, it uses atmospheric oxygen for combustion, improving fuel efficiency and endurance.
    • Strike Capabilities: With evasive manoeuvrability and a flat trajectory, the missile is ideal for deep-penetration and precision attacks.
    • Next-Gen Materials: It is built from materials that withstand 2,000°C+ temperatures, ensuring oxidation resistance and structural integrity.
    • Launch Platforms: The missile is compatible with land systems, fighter jets, and naval vessels, offering operational flexibility.
    [UPSC 2024] Consider the following statements:

    1. Ballistic missiles are jet-propelled at subsonic speeds throughout their flights, 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 *

     

  • 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*

     

  • 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

     

  • 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*

     

  • Science behind right AC Temperature

    Why in the News?

    The Union Ministry of Power is considering a policy to restrict the temperature range of new air conditioners (ACs) in India to between 20°C and 28°C.

    Important Facts and Keywords related to ACs:

    • Efficiency Ratings: ACs have ratings like SEER (Seasonal Energy Efficiency Ratio) or EER (Energy Efficiency Ratio). A higher rating means the AC uses less power to cool the same space.
    • Inverter Technology: Some ACs use inverter compressors, which adjust speed instead of turning on and off repeatedly. This saves energy and keeps the room temperature more stable.
    • Humidity Control: ACs also help by removing moisture from the air. This keeps humidity around 40–60%, which feels more comfortable and prevents mold.
    • Cooling Capacity: ACs are measured in tons. A “ton” of cooling comes from the amount of heat needed to melt 1 ton (~2,000 pounds) of ice in 24 hours.

    How do Air Conditioners Work?

    • Basic Idea: Air conditioners (ACs) work like a heat-moving machine. They take heat from inside your room and push it outside, making the room cooler. They do this using a special fluid called a refrigerant, and a system called the vapour-compression cycle.
    • Main Parts and What They Do:
      • Evaporator: This part is inside your room. The refrigerant, which is very cold here, absorbs heat from the indoor air and turns into a gas. It also removes moisture, so your room feels less humid.
      • Compressor: This is outside the house. It squeezes the refrigerant gas, making it very hot (about 90°C) and high-pressure. This part uses the most electricity in the AC.
      • Condenser: The hot gas then flows through the condenser coil outside. It releases heat into the outdoor air and turns back into a liquid.
      • Expansion Valve: This part lowers the pressure of the liquid refrigerant, making it cold again before it goes back to the evaporator to repeat the cycle.
    • Refrigerant: The refrigerant is a specially designed gas that changes state easily at low temperatures and pressures, making it ideal for absorbing and releasing heat rapidly. Modern refrigerants like R-32 or R-410A are more energy-efficient and environmentally safer than older ones like CFCs and HCFCs.

    Why limit AC Temperature settings?

    • Energy Efficiency Data: According to the Bureau of Energy Efficiency (BEE), setting an AC to 24°C instead of a lower setting can save 6% electricity per 1°C increase.
    • National Impact: If adopted widely, this temperature setting could help India save 20 billion units of electricity annually.
    • Health Risks at Low Temperatures: Temperatures below 18°C are linked to hypertension, asthma, and respiratory infections, especially among children, the elderly, and people with weakened thermoregulation.
    • Evidence from Global Studies: Research in Japan, the UK, and New Zealand shows that slightly warmer indoor settings lead to better respiratory and cardiovascular health.
    • WHO Recommendation: The World Health Organization advises 18°C as the minimum safe indoor temperature in temperate climates.
    • Thermal Comfort Standards: Guidelines like ASHRAE-55 and ISO 7730 suggest optimal indoor temperatures between 20°C and 24°C for lightly clothed people, with adjustments based on local climate and culture.

    Global Cooling Trends and the Need for Regulation:

    • Global AC Usage Growth: As of 2022, there were an estimated 2 billion air conditioners in use worldwide, with residential units tripling since 2000, especially in India and China.
    • Access Gap in Asia-Pacific: Despite this growth, 43% of the Asia-Pacific population still lacks access to adequate cooling solutions.
    • Environmental Impact: Air conditioning significantly increases electricity use and carbon emissions, especially in countries with fossil fuel-dependent grids.
    • India’s AC Load Projection: By 2030, India’s total connected AC load is expected to reach 200 gigawatts, requiring urgent demand management strategies.
    • Consumer Awareness Tools: Initiatives like default settings at 24°C and energy labelling empower consumers to make informed energy-efficient choices.
    • Benefits of Regulation: A regulated temperature range can help lower energy consumption, reduce peak power demand, and support public health.
    [UPSC 2003] Consider the following statements:

    1. Steam at 100°C and boiling water at 100°C contain the same amount of heat.

    2. Latent heat of fusion of ice is equal to the latent heat of vaporization of water.

    3. In an air-conditioner, heat is extracted from the room-air at the evaporator coils and is rejected out at the condenser coils.

    Which of these statements is/are correct?

    Options: (a) 1 and 2 (b) 2 and 3 (c) Only 2 (d) Only 3*

     

  • CROPIC Initiative

    Why in the News?

    The Ministry of Agriculture and Farmers Welfare is set to launch CROPIC (Collection of Real Time Observations & Photo of Crops)- a digital initiative that uses field photography and AI-based models to monitor crop health and automate loss assessment.

    What is CROPIC?

    • Overview: CROPIC is a digital initiative launched by the Ministry of Agriculture and Farmers Welfare.
    • Objective: The aim of CROPIC is to monitor crop health, assess crop losses, and assist with insurance payouts under the Pradhan Mantri Fasal Bima Yojana (PMFBY).
    • Technology Integration: It leverages field photography, artificial intelligence, and a cloud-based analysis system to streamline crop monitoring.
    • Process: CROPIC is designed to automate the crop loss assessment process and improve the transparency and speed of compensation to farmers.
    • Pilot Timeline: The initiative will be piloted during Kharif 2025 and Rabi 2025–26, and expanded nationwide in 2026.
    • Implementation: The project is funded through the Fund for Innovation and Technology (FIAT) under PMFBY, which has an allocation of ₹825 crore.

    Key Features of CROPIC:

    • Mobile App-Based Data Collection: Crops are photographed 4–5 times per season using the CROPIC mobile app, with images collected by farmers and field officials.
    • Crowdsourced Inputs: Real-time photographs are crowdsourced directly from the field, ensuring up-to-date and location-specific crop data.
    • AI-Based Photo Analysis: Images are uploaded to a cloud platform, where AI algorithms analyze them to detect:
      • Crop type and stage
      • Health status
      • Visible damage or stress
    • Web-Based Dashboard: Processed data is presented on a visual dashboard for use by government officials and policymakers.
    • Insurance Integration: During claim processing under PMFBY, officials use the app to gather photographic evidence, automating crop loss verification.
    • Crop Signature Database: CROPIC will help build a digital image library of crop types, aiding future research and development in agricultural analytics.
    [UPSC 2019] For the measurement/estimation of which of the following are satellite images/remote sensing data used?

    1. Chlorophyll content in the vegetation of a specific location

    2. Greenhouse gas emissions from rice paddies of a specific location

    3. Land surface temperatures of a specific location Select the correct answer using the code given below.

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