UPSC GS-3 Science & Technology Comprehensive Notes
Achievements of Indians in Science & Technology
Historic PYQs & Relevance
2018 – Bose–Einstein statistics & its impact (10 M)
2019 – Contributions of Sir M. Visvesvaraya & Dr M. S. Swaminathan (10 M)
Pioneers & Core Contributions
J. C. Bose – Plant physiology (crescograph), microwave research, radio waves
P. C. Ray – Father of Indian pharma, Bengal Chemicals, science communication
C. V. Raman – \text{Raman Effect} (1928); Raman spectroscopy; optics & acoustics
M. N. Saha – Saha\;\text{Ionisation Equation}, stellar spectra, Saha Institute
S. N. Bose – Bose–Einstein statistics & condensate (bosons)
H. J. Bhabha – Cosmic-ray physics, TIFR, three-stage nuclear plan
H. G. Khorana – Decoding genetic code, Nobel 1968, synthetic DNA methods
V. Sarabhai – Founding ISRO, Aryabhata satellite, PRL, IIM-A
S. Chandrasekhar – 1.4\;M_\odot Chandrasekhar limit, stellar evolution, Nobel 1983
Sir M. Visvesvaraya – Dams, flood control, sluice gates, engineering education
M. S. Swaminathan – Green Revolution, HYVs, gene banks
P. C. Mahalanobis – Mahalanobis distance, NSS, ISI, 2nd FYP
D. Mahalanabis – Oral Rehydration Therapy pioneer, WHO cholera control
A. P. J. Abdul Kalam – SLV-III, Agni–Prithvi, Pokhran-II, cryogenic engines, UAVs
C. N. R. Rao – Transition metal oxides, high-T$_c$ cuprates, nanomaterials, hydrogen energy
S. Ramanujan – Partitions, mock theta, black-hole entropy; Dec 22 = National Math Day
Nanotechnology
Definition – Manipulation of matter at 1\,\text{nm}\;(10^{-9}\,\text{m})\;–\;100\,\text{nm} scale
PYQs 2016, 2020: rationale, Mission on Nano-Science & Tech (Nano-Mission), health applications
Key Applications
Smart packaging (hybrid polymers)
Triboelectric nanogenerators (self-powered sensors)
Gold nanoparticles – photovoltaic, imaging, NOMFET memory
Electronics – quantum dots (QD-OLED), graphene screens, CNT chips, nanowire RAM
Space – CNT composites for lightweight spacecraft
Medicine – nanomicelles (cancer), antigen–antibody ELISA, prosthetics, nano-hydrogels, nanobots, nanopore sequencing
Agriculture – Nano-urea, nano-fertilisers (ZnO, chitosan), nano-pesticides, nano-barcodes
Energy – nano-bio-enzymes for biofuels, CNT scrubbers, graphene for green H$_2$
Indian Initiatives – NSTI 2001, Nano-Mission 2007, Centers of Excellence (IIT-B, IISc), Nano UREA, ICONSAT conference, NRFR-Nanotech road-map
Challenges – Phyto-/cytotoxicity, free-radical health risks, self-replicating fears, regulatory vacuum, IPR overlaps, social inequity
Biotechnology
Scope & Principles – Genetic engineering + bioprocess engineering
Fast-growing Indian bio-economy 10\,\text{bn}\rightarrow130\,\text{bn} (2014-24)
Major Achievements
qHPV vaccine, DNA vaccine, intranasal COVID vaccine, Omicron booster
Genome India (6 425 WGS), UMMID rare-disease screening, Dare2eraD TB genomics
GM mustard & cotton events, rice pan-genome, speed breeding
2G ethanol demo, carbon capture to \Omega-3 fatty acids
National Programs – DBT 1986, BIRAC 2012, Nat. Biopharma Mission, GM crop guidelines 2022 (SDN-1/2 exemption)
Societal Applications – Red/Green/Blue biotech, precision agri, bioremediation, personalised medicine, monoclonal Abs
Challenges – Biosafety, public perception, regulatory delays, trait fee litigations, brain-drain, funding & IPR hurdles
INVEST roadmap – Incentivise private, Nurture academia–industry, Venture global, Encourage applied R&D, Support startups, Take flexible policy
Antimicrobial Resistance (AMR)
Definition – Microbes evolve; drugs \not effective
Burden – 1.27\,\text{million} deaths (2019); \$1\,\text{–}\,3.4\,\text{tn} GDP loss by 2030
India – National AMR Action Plan 2017, NARS-Net, SECURE, production-linked incentive to revive Penicillin-G
Way Forward – Antibiotic use policy, alternatives, financing via Green Climate Fund, update global action plan
Fixed-Dose Combination (FDC) Drugs
Definition – Two + actives in fixed ratio; ‘new drug’ under D&C Rules 1945
Pros – Pill burden ↓, cost-effective, better adherence
Cons – Dose inflexibility, AMR risk, many irrational FDCs
Recent – CDSCO re-permitted 5 earlier-banned FDCs; calls for stronger post-market surveillance
Stem-Cell Therapy
Sources – Embryonic (pluripotent) vs adult somatic (multipotent)
Applications – Cartilage repair, cardiac regeneration, neuro-degenerative (PD, AD), autoimmune modulation, haematological disorders
Challenges – Ethical ESCs, immune rejection, tumorigenicity, cost, regulatory gaps
Gene-Therapy & Genome
Gene Therapy Types – Germ-line (banned) vs somatic; vectors: viral, non-viral, CRISPR
ICMR Guidelines 2019 – GTAEC oversight; focus on rare diseases
Genome India – 10 000 WGS, 135 million variants; MYBPC3 cardiac mutation; data at IBDC Faridabad
Vaccinology & COVID Lessons
Principles – Present antigen → immunological memory (T/B cells)
Indian Approaches – Viral-vector (Covishield), inactivated (Covaxin), DNA (ZyCoV-D), mRNA (Omicron booster)
AstraZeneca TTS – Rare thrombosis; benefit > risk per WHO; Vaxzevria withdrawn amid updated vaccines
Blockchain Technology
Basics – Distributed ledger, cryptographic security, immutable blocks
Global Use – Estonia e-governance, China BSN, UK National Digital Twin
India – National Blockchain Framework (MeitY), IndiaChain (NITI), CoE-Bengaluru, Telangana Blockchain District
Applications – Land records, e-voting, supply-chain provenance, Aadhaar security, agri traceability, carbon credits
Challenges – Scalability, energy, regulatory grey zone, privacy, interoperability, smart-contract bugs
Quantum Computing & Mission
Principles – Qubit superposition |0\rangle+|1\rangle, entanglement
Quantum Supremacy – Google Sycamore 200\,\text{s} vs Summit 10^{4}\,\text{yr}
Applications – Cryptography (Shor), drug discovery, portfolio optimisation, climate models, atomic clocks
India – National Quantum Mission \text{₹}6{,}000\,\text{cr}; hubs for computing, comm, sensors; QuEST, DYSL-QT; QSim, test-beds
Challenges – Decoherence, error-correction, talent gap, quantum-safe crypto need
Internet of Things (IoT)
Definition – Network of sensor-embedded devices communicating via cloud
Enablers – Sensors/actuators, connectivity (Wi-Fi, LoRa), cloud, big-data, security
Use-cases – Smart health (tele-ICU), Industry 4.0, retail shelf-monitoring, precision agri, smart grids
Risks – Cyber-security, interoperability, data deluge, regulatory compliance
Supercomputing in India
PARAM series – PARAM Shivay, Brahma, Siddhi (210 AI PFLOPS)
Pratyush + Mihir – Weather–climate
National Supercomputing Mission – 70+ HPC grid, indigenous interconnect; pillars: infra, apps, R&D, HR
Applications – CFD, genomics, pandemic modeling, seismic imaging, flood early warning
Challenges – Funding, energy consumption, talent, data security
Nuclear Technology
Fission vs Fusion – Mass defect \Delta m\rightarrow\Delta E=mc^2
India’s 3-Stage Plan – PHWR \to FBR \to Th-U-233 cycles
Bharatiya Antariksha Station target 2035; PFBR 500 MWe nearing criticality
Small Modular Reactors (BSR) – <300\,\text{MW_e}; partnership with pvt sector
Fusion Front – ITER (India member), SST-1, ADITYA tokamak
Concerns – Waste, cost >₹7/\text{kWh}, proliferation, liability
Robotics
Industrial Rise – India now 10th in installations; CAGR 15\%
Types – Industrial arms, mobile AGVs, humanoids, medical robots, bomb-disposal (Daksha), space (Vyom-mitra)
Prohibitive Labour Areas – Nuclear plants, septic cleaning (Bandicoot), mine rescue, space EVA
Constraints – Cost, precision, ethical autonomy, regulations
Intellectual Property Rights (IPR)
IPR Spectrum – Patents, trade-marks, copyright, design, GIs, plant varieties, TK
Section 3(d) – Prevents evergreening; Novartis Glivec case
TKDL – 2 million Ayurveda/Unani/Siddha formulas; prevents erroneous patents (turmeric, neem)
National IPR Policy 2016 – Awareness, generation, legal, admin, commercialisation, enforcement, HR
ISSUES – Backlog, weak enforcement, data exclusivity debate, section 84 compulsory licensing, USTR Priority Watch
Artificial Intelligence & Generative AI
ML vs DL vs Generative AI – GANs, VAEs, transformers (ChatGPT, Gemini, Llama-3)
Applications – Health (radiology AI >95\% accuracy), agri (FASAL), defence (SIMA game agent, swarm drones), justice (SUPACE)
IndiaAI Mission \text{₹}10{,}300\,\text{cr} – Compute 10 000 GPU, Innovation Centre, datasets, FutureSkills, startup finance
Deep-fake & Bias risks – Need Safe & Trusted AI; Bletchley Declaration; GPAI New Delhi; EU AI Act
Brain-Computer Interface – Neuralink, MiBMI; invasive ↔ non-invasive; applications prosthetics, ALS communication
Artificial General Intelligence – Beyond narrow AI; benefits vs existential risks, calls for global regulation
Battery Energy Storage Systems (BESS)
Types – Non-flow (PbA, Li-ion, Na-S) vs flow (Vanadium RFB)
Need – Grid stability, RE integration, reduce \$\text{8 bn} import bill
Challenges – Raw-material scarcity, recycling, GST, safety
VGF Scheme 2023 – 4\,000\,\text{MWh} BESS, viability gap \approx\text{₹}\,3{,}700\,\text{cr}
Space Technology
ISRO Milestones – SITE 1975, SLV-3 1980, PSLV/GSLV, Chandrayaan 1\,2\,3, Mars Orbiter, Aditya-L1
Indian Space Policy 2023 – Roles: ISRO (R&D), NSIL (commercial), IN-SPACe (authorisation), private end-to-end
Gaganyaan – LVM3 human-rated, 2 unmanned + 1 crewed (2025), CE-20 engine qualified
Aditya-L1 – At Lagrange L1; payloads VELC, SUIT, ASPEX, HEL1OS
NISAR – Dual-band SAR NASA-ISRO; global biomass, ice, hazards
Space Debris – \sim130\,\text{million} >1\,\text{mm} objects; NETRA SSA, IS4OM; Kessler syndrome
Private Sector Push – IN-SPACe, Skyroot (Vikram-S), Agnikul private launchpad, Dhruva & Digantara payloads
Outer-Space Governance – Artemis Accords (43 signatories incl. India), Outer-Space Treaty 1967, LIGO-India 2030, BESS launchport at Kulasekarapattinam
All equations & scientific constants are presented in LaTeX as per instructions.