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GS Paper: GS3-17.Awareness in the fields of IT, Space, Computers, Robotics, Nano-technology, Bio-technology and issues relating to Intellectual Property Rights.

  • Agricultural Fungicides causing C. Tropicalis Infections

    Why in the News?

    Researchers at Fudan University found that overuse of the fungicide tebuconazole is causing azole-resistant Candida tropicalis to emerge — a deadly fungus with a 55–60% mortality rate.

    About Candida tropicalis:

    • Overview: Candida tropicalis is a fungal pathogen prevalent in tropical and subtropical regions, including India.
    • Type: It is a yeast species that causes invasive candidiasis, affecting the bloodstream and internal organs.
    • High-Risk Groups: The fungus is opportunistic, primarily infecting immunocompromised individuals such as cancer patients and those in ICUs.
    • Mortality Rate: The infection has a high mortality rate, estimated at 55–60% when it becomes systemic.
    • Drug Treatment: Standard treatments include azole-class antifungals such as fluconazole and voriconazole (widely used during COVID-19 induced Black Fungus).
    • Adaptability: The pathogen shows strong genomic plasticity, allowing it to survive hostile environments and develop drug resistance.

    Reasons for Spread and Resistance:

    • Agricultural Influence: Studies show that azole fungicides like tebuconazole, used in farming, contribute to azole-resistant C. tropicalis
    • Environmental Exposure: These fungicides accumulate in soil and water, promoting the evolution of resistant strains.
    • Genetic Adaptations: Resistant strains develop aneuploidy (extra chromosomes), aiding resistance but reducing growth in drug-free environments.
    • Efflux Pumps: Some strains duplicate genes like TAC1, boosting drug-efflux pumps (e.g., ABC transporters) to eject antifungals from the cell.
    • Increased Virulence: Resistant strains have proven more virulent in animal studies, posing greater public health risks.

     

  • Substandard Cancer Drugs: A Global Public Health Alarm

    Why in the News?

    A global investigation has revealed that vital chemotherapy drugs used in over 100 countries have failed quality tests, posing life-threatening risks to cancer patients.

    Various Drugs Used for Cancer Treatment:

    • Cisplatin is a platinum-based drug discovered in the 1960s. It binds to DNA in cancer cells and is widely used to treat testicular, ovarian, bladder, and lung cancers. It is known to cause kidney damage, hearing loss, and immune suppression.
    • Oxaliplatin is another platinum compound mainly used to treat advanced colorectal cancer. It works similarly to cisplatin but may also cause nerve-related side effects.
    • Cyclophosphamide is used for treating breast cancer, leukaemia, sarcoma, and lymphoma. It damages cancer cell DNA and lowers white blood cell counts, weakening the immune system. It can also cause bladder inflammation.
    • Doxorubicin, known as the “Red Devil”, is derived from soil bacteria and used against breast cancer, leukaemia, and sarcomas. It disrupts DNA replication but has serious side effects, including heart damage and hair loss.
    • Methotrexate blocks enzymes involved in DNA synthesis and is used for leukaemia, lymphoma, and various tumors. It is often followed by leucovorin, which helps protect normal cells from damage.
    • Leucovorin is not a chemotherapy drug but a supportive agent used with methotrexate to reduce toxicity. It is a form of vitamin B9 introduced in the 1950s.

    Recent Quality Test Failure

    • Investigation: A 2024 investigation revealed that chemotherapy drugs sold in over 100 countries failed basic quality standards.
    • Failure of Generics: The drugs tested were generics. Also, 189 unexpired samples were tested; 20% failed.
    • Indian Pharma Under Radar: 17 manufacturers were flagged, with 16 based in India. Drugs failed for containing either too little (under 88%) or too much (over 112%) active ingredient.
    [UPSC 2005] It begins as a single cell and grows into a merciless disease that claims millions of lives year after year. But scientists are steadily unlocking its mysteries, and the fight against it may now have reached a dramatic turning point. New discoveries promise better therapies and hope in the war against …” The disease referred to in the above quotation is:

    Options: (a) Cancer (b) AIDS (c) Tuberculosis (d) Alzheimer’s disease

     

  • Sam Altman’s World ID Project

    Why in the News?

    World ID is Sam Altman’s ambitious project to create a secure, biometric-based digital identity for everyone in the age of AI.

    What is World ID?

    • World ID is a digital identity system launched by Sam Altman’s company Tools for Humanity as part of the Worldcoin project in July 2023.
    • It aims to verify that a person is a real, unique human being—especially in an age of AI-generated bots—using biometric iris scans.
    • How Does It Work?
      • The identity is created using a device called the Orb, which captures the iris pattern and generates a unique cryptographic code (not storing the image itself).
      • This ID is then linked to the World App, and the user can access various services while proving they are human—without revealing their actual identity.
      • The system is decentralized and uses blockchain technology to store identity proofs securely.

    Key Features of World ID:

    • Biometric Verification: Uses iris scanning through the Orb to establish a unique identity.
    • Global Access: Users from over 160 countries have access to Worldcoin and World ID features.
    • Decentralized Protocol: Built on open-source, privacy-preserving cryptography, such as zero-knowledge proofs.
    • World App Integration: Enables users to locate Orbs, receive Worldcoins, and use the digital ID across apps.
    • World Chain: A blockchain linked to World ID that supports apps and services tied to identity.
    • Crypto Incentive: Users may receive Worldcoin (WLD) tokens for enrolling.
    • Privacy Controls: Promises anonymity, non-surveillance use, and code transparency.
    • Hardware Dependency: Requires a physical Orb or the new Orb Mini to generate IDs.

    How it differs from Aadhaar?

    World ID Aadhaar
    Ownership Private project by Tools for Humanity Government of India
    Launch Year 2023 2009
    Technology Used Iris scan via Orb; Blockchain-based ID Biometric + Demographic data via central database
    Legal Framework No national law backing it yet Aadhaar Act, 2016
    Purpose Global ID to prove human uniqueness National ID for accessing services & welfare
    Data Privacy Claims privacy via zero-knowledge cryptography Data regulated by UIDAI under Indian law
    Adoption Level 12 million users globally Over 1.3 billion users in India
    Hardware Needed Orb device Fingerprint/iris scanners at enrollment centers
    Verification Use AI-bot detection, global ID use Government subsidies, banking, KYC, etc.

     

  • In-Body CAR T-Cell Therapy

    Why in the News?

    A new study published in Science journal shows that “In-Body CAR T-Cell Therapy” marks a breakthrough by enabling direct immune cell reprogramming for faster, safer treatment of cancer and autoimmune diseases.

    What is CAR T-Cell Therapy?

    • Overview: CAR T-cell therapy is a treatment where a patient’s own T cells are genetically modified to detect and kill cancer cells.
    • Science behind it: Scientists extract T cells and add a Chimeric Antigen Receptor (CAR) gene, which enables them to identify cancer cells.
    • Working: These modified T cells are infused back into the patient, where they multiply and actively attack cancer.
    • Effectiveness: The therapy has shown high success against certain blood cancers and is now being studied for autoimmune disorders like lupus.
    • Issues: The traditional therapy is expensive (₹60–70 lakh), slow, and requires chemotherapy and specialised lab facilities.

    Recent Breakthrough: In-Body CAR T-Cell Therapy

    • Approach: A new technique uses mRNA-loaded lipid nanoparticles (LNPs) to deliver instructions directly inside the body.
    • Targeting Cells: These nanoparticles are programmed to locate and enter killer T cells, converting them into CAR T-cells internally.
    • Benefits offered: This method eliminates the need for cell extraction, chemotherapy, or viral vectors, making it faster and safer.

    Significance for India:

    • Scalable Innovation: This platform may lower treatment costs and offer wider access in countries like India with high cancer and autoimmune burdens.
    • Infrastructure Relief: Its in-body nature avoids dependence on advanced labs, making it suitable for resource-constrained settings.
    [UPSC 2019] What is Cas9 protein that is often mentioned in news?

    Options: (a) A molecular scissors used in targeted gene editing* (b) A biosensor used in the accurate detection of pathogens in patients (c) A gene that makes plants pest-resistant (d) A herbicidal substance synthesized in genetically modified crops

     

  • 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*

     

  • 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.

  • [16th June 2025] The Hindu Op-ed: What are flue gas desulphurisation units?

    PYQ Relevance:

    [UPSC 2022] Discuss global warming and mention its effects on the global climate. Explain the control measures to bring down the level of greenhouse gases which cause global warming, in the light of the Kyoto Protocol, 1997.

    Linkage:  SO2 as “one of the major greenhouse gases that cause global warming”. Flue Gas Desulphurisation (FGD) units are designed specifically to remove SO2 emissions from the combustion of fossil fuels. Therefore, FGD units serve as a direct “control measure to bring down the level of greenhouse gases” as addressed by the question.

     

    Mentor’s Comment:  India’s top science advisory group has suggested ending the 2015 rule that made it compulsory for all coal-based power plants to install Flue Gas Desulphurisation (FGD) units. This has raised serious concerns because FGDs are key to reducing sulphur dioxide (SO₂) pollution, which causes 15% of India’s PM2.5 levels and leads to breathing problems, environmental damage, and climate change. Although installing FGDs is expensive (₹1.2 crore per MW), experts warn that dropping the plan could harm public health and clean air efforts. Worryingly, only 39 of 537 plants have installed FGDs, and deadlines keep getting pushed back.

     Today’s editorial focuses on the analysis of the installation of the Flue Gas Desulphurisation (FGD) units in a thermal power plant. This content is very relevant to GS Paper III (Environment, Science and Technology) Mains.

    _

    Let’s learn!

    Why in the News?

    A group of experts, led by Principal Scientific Advisor Ajay Sood, has recently suggested that India should cancel the 10-year-old rule that requires all coal-based thermal power plants to install Flue Gas Desulphurisation (FGD) units.

    Why India should cancel the 10-Year-Old Rule (2015 FGD Mandate)?

    • High Installation Cost Burden: Installing FGD units costs around ₹1.2 crore per MW, which can significantly raise power generation costs and electricity tariffs. Eg: For 97,000 MW of new capacity, the cost would be about ₹97,000 crore, making power less affordable.
    • Delayed and Poor Implementation: Despite the 2015 rule, compliance has been dismal—only 39 out of 537 plants had FGDs installed by 2025. Eg: Repeated deadline extensions (up to 2029) show lack of feasibility and institutional capacity.
    • Limited Local Air Quality Impact in Some Areas: In certain regions, the contribution of SO₂ emissions from TPPs to PM2.5 levels is relatively small. Eg: In Delhi, most air pollution comes from other sources like vehicles and construction, so FGDs at distant plants may offer minimal benefit.

    What is a Flue Gas Desulphurisation (FGD) unit?

    • FGD units are devices used in coal-fired thermal power plants (TPPs) to remove sulphur dioxide (SO₂) from flue gas. Flue gas is a byproduct of burning fossil fuels and contains pollutants like SO₂, CO₂, NOx, and particulate matter.
    • Three common FGD technologies:
      • Dry sorbent injection (adds powdered limestone to flue gas).
      • Wet limestone treatment (reacts SO₂ with limestone slurry to form gypsum).
      • Sea water scrubbing (used near coastal areas).

    How does it reduce SO₂ emissions from thermal power plants?

    • Chemical Neutralisation Reaction: FGD units use alkaline substances like limestone or lime to react with acidic SO₂ in flue gas, converting it into stable, non-toxic compounds. Eg: In wet limestone FGD, SO₂ reacts with limestone slurry to form gypsum (CaSO₄·2H₂O), a harmless industrial byproduct.
    • Efficient Scrubbing Techniques: Technologies like wet scrubbers or dry sorbent injection physically remove SO₂ from exhaust gases before release into the atmosphere. Eg: Dry sorbent injection sprays powdered lime into the flue gas stream, which binds with SO₂ and is later captured by filters.
    • Controlled Emission Discharge: FGD ensures that the treated flue gas released into the environment has significantly lower SO₂ levels, complying with environmental norms. Eg: Power plants near coasts use sea water FGD, where sea water absorbs SO₂ and is then treated before being discharged safely.

    Why are SO₂ emissions harmful?

    • Respiratory and Health Issues: Sulphur dioxide (SO₂) irritates the respiratory system, causing problems like asthma, bronchitis, and lung damage, especially in children and the elderly. Eg: Studies in urban industrial areas show a direct link between SO₂ exposure and increased hospital admissions for respiratory illnesses.
    • Formation of Secondary Particulate Matter (PM2.5): SO₂ reacts in the atmosphere to form fine particulate matter (PM2.5), which can penetrate deep into lungs and enter the bloodstream, posing serious health risks. Eg: According to studies, 80% of PM2.5 from coal combustion is due to secondary particles formed from SO₂.
    • Contribution to Acid Rain: SO₂ combines with water vapor in the atmosphere to form sulphuric acid, leading to acid rain that damages soil, crops, forests, and aquatic ecosystems. Eg: Regions near coal-fired plants have reported acidic lakes and damaged crops due to acid rain deposition.
    • Environmental Degradation: High SO₂ levels can corrode buildings, especially monuments made of limestone or marble, and degrade overall air and water quality. Eg: The Taj Mahal has shown signs of yellowing, partly attributed to SO₂-related pollution.
    • Climate and Visibility Impact: Though SO₂ itself is not a greenhouse gas, it leads to formation of aerosols, affecting cloud formation, reducing visibility, and causing climate imbalance. Eg: In industrial belts, hazy skies and temperature variations are linked to SO₂-derived aerosols.

    What is the status of FGD installation in India (2025)?

    • Low Overall Commissioning: Only about 39 out of 537 thermal power plant units (≈ 19,430 MW capacity) have commissioned FGD systems, representing ~11% of the total required capacity. Eg: Just 13 out of 35 units within 300 km of Delhi have installed FGDs, showing slow progress in high-pollution zones.
    • Stalled Projects and Delays: Contracts have been awarded for about 238 units (~105,200 MW), and 139 units (~42,847 MW) are still in the tendering stage, but many projects remain stalled. Eg: Some plants, especially near Delhi, may take up to 36 months to complete FGD installation due to regulatory and logistical hurdles.
    • Repeated Deadline Extensions: Compliance deadlines have been extended multiple times: from 2017 → 2024 → 2026–2029, depending on the location and plant category. Eg: The Ministry of Environment has pushed back deadlines for thermal plants in Delhi NCR without strict justification, raising concerns about enforcement.

    Way forward: 

    • Prioritised FGD Installation: Expedite FGD implementation in high-emission and densely populated zones to balance cost and health impact.
    • Policy and Financial Support: Provide targeted subsidies or incentives to TPPs and integrate FGD costs into long-term tariff planning for smoother adoption.

  • 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*