BharatNotes Why this chapter matters for UPSC: Science and Technology is a direct GS3 component. Understanding the nature of science — its evolving character, the role of inquiry, and the interplay between science, technology, and society — is essential for framing answers on emerging technologies, India's science policy, and indigenisation initiatives. This chapter builds the foundational vocabulary for UPSC S&T questions.
PART 1 — Quick Reference Tables
| Concept | Definition | Example |
|---|---|---|
| Science | Systematic study of the natural world through observation and experimentation | Discovery of penicillin by Fleming (1928) |
| Technology | Application of scientific knowledge for practical purposes | Solar panels, vaccines, smartphones |
| Scientific Method | Observe → Question → Hypothesise → Experiment → Conclude | Testing effect of fertiliser on crop yield |
| Observation | Gathering data through senses or instruments | Recording temperature daily |
| Hypothesis | A testable explanation or prediction | "More sunlight increases plant growth" |
| Experiment | Controlled procedure to test a hypothesis | Growing identical plants under different light conditions |
| Branch of Science | Studies | UPSC Relevance |
|---|---|---|
| Physics | Matter, energy, forces, motion | Nuclear energy, space tech, optics |
| Chemistry | Composition and transformation of substances | Fertilisers, medicines, pollution |
| Biology | Living organisms | Health policy, biodiversity, food security |
| Earth Science | Earth's structure, atmosphere, oceans | Climate change, natural disasters, water security |
| Astronomy | Stars, planets, space | ISRO missions, space policy, eclipses |
| Milestone in Indian Science | Year | Significance |
|---|---|---|
| Indian Space Research Organisation (ISRO) founded | 1969 | Space technology for communication, weather, navigation |
| Chandrayaan-1 — water discovered on Moon | 2008 | First confirmation of water on lunar surface |
| Mangalyaan (Mars Orbiter Mission) | 2013 | India's first interplanetary mission; most cost-effective |
| Chandrayaan-3 soft landing (Vikram lander) | 2023 | India — 4th country to soft-land on Moon; 1st near south pole |
| Aditya-L1 launched | 2023 | India's first solar observatory at Lagrange Point L1 |
| XPoSat | Jan 1, 2024 | India's first X-ray polarimetry satellite; 2nd country after USA |
| INSAT-3DS | Feb 17, 2024 | 3rd-gen meteorological satellite; funded by Ministry of Earth Sciences |
| SpaDeX (Space Docking Experiment) | Dec 30, 2024 | India 4th country to achieve orbital docking (docking achieved Jan 16, 2025) |
| NISAR | Jul 30, 2025 | First India-NASA joint satellite; L+S band SAR; operational Jan 2026 |
PART 2 — Detailed Notes
Science is a dynamic, ever-evolving body of knowledge built through systematic observation, questioning, and experimentation. It is not a fixed collection of facts but a process of inquiry. The word "science" comes from the Latin scientia, meaning knowledge.
Technology is the application of scientific knowledge to solve real-world problems. Science and technology are deeply interconnected — scientific discoveries lead to new technologies, and new technologies enable new scientific discoveries. Example: Discovery of electromagnetism (science) → electric motors and generators (technology).
Scientific Curiosity is the driving force behind all scientific progress. The ability to question "why" and "how" ordinary phenomena occur has led to path-breaking discoveries — from Newton's apple to Darwin's finches to Fleming's penicillin mould.
India's Science and Technology Policy Framework
India's National Science, Technology and Innovation Policy (STIP 2020) aims to position India among the top 3 scientific superpowers by 2030. Key pillars:
- Decentralised science funding and evidence-based policymaking
- Doubling public R&D investment
- Making India a global hub for scientific talent
Key Government Initiatives:
- National Research Foundation (NRF): Established under the Anusandhan National Research Foundation Act, 2023; seed fund of ₹50,000 crore over 5 years for funding research across Indian universities
- Mission Innovation: India committed to doubling clean energy R&D investment
- INSPIRE scheme: Innovation in Science Pursuit for Inspired Research — attracts talented students towards science
- PM-PRANAM: Promotes alternative fertilisers, linking chemistry to sustainable agriculture
- National Quantum Mission (2023–2031): ₹6,003 crore outlay; targets quantum computing, communication, sensing
Why Science is "Ever-Evolving"
Science changes because new evidence can overturn old theories. Examples:
- Flat Earth → Spherical Earth: Ancient Greeks (Eratosthenes, ~240 BCE) calculated Earth's circumference with remarkable accuracy
- Geocentric → Heliocentric: Copernicus (1543) replaced the Earth-centred model with a Sun-centred one
- Newtonian Mechanics → Quantum Mechanics: At sub-atomic scales, classical physics fails; quantum theory explains behaviour of electrons, photons
- Static Continents → Plate Tectonics: Wegener's continental drift hypothesis (1912) was rejected, but later confirmed by seafloor spreading evidence in the 1960s
Interdisciplinary Nature: Modern science rarely works in silos. Climate science combines physics, chemistry, biology, oceanography, and economics. ISRO missions require physics, materials science, computer science, and engineering. UPSC GS3 S&T questions frequently test this cross-cutting nature.
India's Ancient Scientific Heritage: India has a rich scientific tradition — Aryabhata (zero and heliocentric concept), Brahmagupta (algebra), Charaka and Sushruta (medicine), Varahamihira (astronomy). NEP 2020 promotes integration of this heritage with modern science education.
[Additional] 1a. India's R&D Spending Crisis — The Gap Between Ambition and Reality
The chapter positions India as a growing scientific nation with milestones like Chandrayaan-3 and Aditya-L1, and describes the National Research Foundation (NRF) as a major initiative. What is missing is the quantitative reality: India's Gross Expenditure on Research and Development (GERD) as a share of GDP has stagnated at critically low levels — a structural constraint on the scientific ambitions the chapter describes.
Key R&D Investment Concepts:
| Term | Meaning | India's Status |
|---|---|---|
| GERD | Gross Expenditure on Research and Development — total spending on R&D by all sectors as % of GDP | 0.64% of GDP (2020-21, latest official data; DST R&D Statistics 2022-23) |
| STIP 2020 target | Science Technology and Innovation Policy 2020 target for GERD | 2% of GDP by 2030 |
| Private sector R&D share | Share of GERD contributed by private industry | ~36.4% in India vs. 70%+ in USA, China, South Korea |
| GII | Global Innovation Index — WIPO annual ranking of 133 economies on innovation inputs and outputs | India: 39th in 2024 (up from 81st in 2015) |
Why GERD matters for science: The chapter describes how scientific discoveries require sustained investment in experiments, instruments, and trained scientists. GERD is the national-level measure of this investment. Countries like South Korea (4.9%), Israel (5.4%), and China (2.4%) invest 3-8x more of their GDP in R&D than India — directly enabling faster technology development and more scientific discoveries.
The private sector gap: In peer economies, private companies (tech firms, pharma, manufacturing) fund 70-80% of R&D because it generates commercial advantage. In India, the government funds ~63.6% of GERD — meaning the scientific ecosystem is heavily dependent on government budgets rather than innovation-driven private investment. This is the structural gap STIP 2020 and the NRF aim to close.
[Additional] India's R&D Investment Gap — GII 2024 and GERD Data (GS3 — Science & Technology Policy):
India's GII 2024 performance (WIPO, September 2024):
- Overall rank: 39th out of 133 economies — India's highest ever GII rank
- Improvement trajectory: 81st (2015) → 66th (2017) → 48th (2020) → 40th (2023) → 39th (2024)
- India is ranked 1st among lower-middle-income economies and 4th among central and southern Asian economies
- India is now a top S&T cluster country: 4th globally in number of science and technology clusters (after USA, China, Germany)
- Strengths in GII 2024: ICT services exports, unicorn density, scientific publications, intangible asset intensity
- Weaknesses in GII 2024: Regulatory quality, ease of starting a business, infrastructure — and critically, GERD as % of GDP
India's GERD — the stagnation problem:
- GERD in 2020-21: 0.64% of GDP (DST R&D Statistics and Indicators 2022-23, Government of India)
- This has barely moved in a decade — it was 0.69% in 2011-12
- Niti Aayog (May 2026) Science & Innovation report flagged that India is on track to miss the STIP 2020 target of 2% of GDP by 2030 without structural reforms
- Absolute GERD (2020-21): approximately ₹1,27,381 crore (~US$16 billion) — compares to China's ~US$668 billion and USA's ~US$806 billion
Anusandhan National Research Foundation (ANRF) — operational status:
- Established under the Anusandhan NRF Act, 2023; came into force February 5, 2024 (MoST notification)
- ANRF Board chaired by the Prime Minister; Governing Board by the Principal Scientific Adviser
- FY 2024-25 budget allocation: ₹966 crore; ₹721 crore utilised (as of March 2025, PIB)
- First programme launches (October 2024):
- PM Early Career Research Grant (PMECRG): ₹60 lakh per researcher over 3 years for early-career scientists (within 10 years of PhD); to cover 700 researchers annually
- MAHA-EV Mission: Mission for Affordable and Holistic Advancement of Electric Vehicles — industry-academia collaboration for EV battery technology (ANRF + NITI Aayog + DST)
- Advanced Research Grant (ARG): Call for proposals expected June 2025 for mid-career and senior researchers
- Funding model: ₹50,000 crore over 5 years (FY 2023-28); 70% from private/industry sector, 30% government — designed to address the private sector GERD gap
UPSC synthesis: The chapter's optimistic narrative about India's scientific achievements (Chandrayaan-3, NRF) needs to be read alongside the structural constraint of 0.64% GERD — India is punching above its weight in science (GII rank 39) despite underinvesting in R&D. The ANRF is the policy instrument to close the GERD gap by catalysing private sector R&D investment. UPSC GS3 questions on S&T policy frequently ask about this gap: why India's output (papers, missions) exceeds what its R&D input would predict, and what policy reforms (ANRF, STIP 2020, NQM) address the structural weaknesses. GII 2024's rank 39 and the 0.64% GERD figure together make a complete answer on India's science ecosystem.
[Additional] 1b. Space Debris — The Scientific Challenge the Chapter Doesn't Address
The chapter celebrates India's space milestones (Chandrayaan-3, Aditya-L1, SpaDeX) without addressing the growing problem those very missions contribute to: space debris. As India launches more satellites and conducts more missions, the management of orbital debris has become a critical science and policy challenge — directly relevant to the sustainability of the space-based technologies the chapter describes.
Space Debris — Key Concepts:
| Term | Definition | Example |
|---|---|---|
| Space debris (orbital debris) | All non-functional, human-made objects in orbit — defunct satellites, rocket bodies, fragments from collisions and explosions | ~27,000 tracked objects >10 cm; ~1 million fragments 1-10 cm estimated |
| Low Earth Orbit (LEO) | Altitude 160-2,000 km — most congested orbital region | ISS operates at ~400 km; Starlink constellation at ~550 km |
| Kessler Syndrome | Theoretical cascade scenario: debris collisions generate more debris → chain reaction that makes entire orbital shells unusable | Described by NASA scientist Donald Kessler (1978); now a real risk in LEO |
| Conjunction warning | Alert that two tracked objects may come dangerously close; requires satellite operators to fire thrusters to avoid collision | ISRO ISTRAC issues conjunction warnings for Indian satellites |
| End-of-life disposal | International guideline: satellites in LEO should re-enter atmosphere within 25 years of end-of-life | New IADC guideline proposes tightening to 5 years (2024 draft) |
Why debris is dangerous: At orbital velocities (~7-8 km/s in LEO), even a 1 cm fragment carries kinetic energy equivalent to a hand grenade. The ISS has performed ~32 debris avoidance manoeuvres since 1999. India's communication satellites (GSAT series), navigation satellites (NavIC/IRNSS), and Earth observation satellites (Cartosat, ResourceSat) are all at risk.
[Additional] India's Space Debris Challenge — ISRO's Response and Global Framework (GS3 — Science & Technology / Space Policy):
Global debris situation (2024-25):
- Total tracked objects: ~27,000 objects >10 cm tracked by the US Space Surveillance Network (as of 2024)
- Total estimated fragments: Over 1 million pieces between 1 cm and 10 cm; ~130 million fragments <1 cm — untrackable but still damaging
- LEO congestion: ~9,000 active satellites (end 2024) competing with debris; Starlink alone has ~6,000 satellites; planned mega-constellations (Amazon Kuiper, OneWeb) will add thousands more
- Recent events: Russia's ASAT test (November 2021) destroyed Cosmos 1408, creating 1,500+ tracked fragments still in orbit as of 2025; Chinese ASAT test debris (2007) remains the largest single debris-generating event in history
India-specific debris context:
- India's ASAT test (Mission Shakti, March 27, 2019): DRDO destroyed Microsat-R in LEO (~283 km); created ~400 trackable fragments; most re-entered within months (low altitude choice was deliberate to minimise long-term debris) — India became 4th country with ASAT capability
- ISRO System for Safe and Sustainable Space Operations Management (IS4OM): Established 2022; India's national space situational awareness system — tracks debris, issues conjunction warnings, monitors re-entry of objects
- ISRO's debris record: India has not had a major debris-causing collision; follows IADC (Inter-Agency Space Debris Coordination Committee) 25-year re-entry guideline for LEO satellites
- SpaDeX (December 2024): The orbital docking experiment also demonstrated India's ability to conduct rendezvous manoeuvres — the same technology needed for future Active Debris Removal (ADR) missions
International policy framework:
- IADC (Inter-Agency Space Debris Coordination Committee): 13 member space agencies including ISRO; issues voluntary guidelines — no binding international treaty exists
- UN COPUOS: Working on Long-Term Sustainability Guidelines for Space Activities (adopted 2019); 21 guidelines including debris mitigation
- Proposed 5-year re-entry rule: IADC draft (2024) proposes tightening LEO disposal from 25 years to 5 years — would affect design requirements for all future Indian satellites
UPSC synthesis: Space debris is the "tragedy of the commons" problem in orbit — each actor's launches impose costs on all others, but no binding international mechanism enforces debris mitigation. India's position is nuanced: an emerging space power that conducted an ASAT test (creating temporary debris) while also building IS4OM for responsible space operations. UPSC questions increasingly test this tension between space capability development and space sustainability. The chapter's science (satellites, orbits, space exploration) sets up this policy dimension: every satellite India launches must eventually be disposed of safely, and India's growing space economy (NSIL commercial launches, IN-SPACe private operators) makes this an urgent regulatory design challenge.
Exam Strategy
- Science and Technology questions in Prelims often test applications — what a technology does, not just what it is. Learn the "so what" of each discovery.
- Know ISRO mission timelines: Chandrayaan-1 (2008), Chandrayaan-2 (2019, orbiter still operational), Chandrayaan-3 (2023 — success), Aditya-L1 (2023), XPoSat (Jan 2024), INSAT-3DS (Feb 2024), SpaDeX (Dec 2024 — orbital docking Jan 16, 2025), NISAR (Jul 2025).
- SpaDeX key fact: India is 4th country to achieve orbital docking — after USA, Russia, and China. This is a high-frequency Prelims target.
- NISAR key fact: First India-NASA joint satellite — do not confuse with ISRO-ESA or ISRO-JAXA collaborations.
- National Research Foundation (NRF) — established under Anusandhan NRF Act, 2023 — frequently appears in current affairs questions. Know the funding model (70% from private sector, 30% government).
- Do not confuse STIP 2020 (Science Technology Innovation Policy) with NEP 2020 (National Education Policy) — both released in 2020 but cover different domains.
- The Scientific Method has a fixed sequence: Observation → Question → Hypothesis → Experiment → Analysis → Conclusion. CSAT reasoning questions sometimes test logical sequence.
- Prelims trap: Chandrayaan-3's Vikram lander touched down near the lunar south pole — not the equator — making India the first to land near that region.
Practice Questions
Q1. With reference to India's achievements in space science and technology, which of the following statements is/are correct? (Prelims 2023)
(a) Chandrayaan-3 was India's first attempt to land on the Moon
(b) Aditya-L1 is placed at the Lagrange Point L1 between the Earth and the Sun
(c) ISRO was established in 1972
(d) The Mars Orbiter Mission was launched in 2015
(b) Aditya-L1 is placed at the Lagrange Point L1 between the Earth and the Sun
Q2. Consider the following statements about the Anusandhan National Research Foundation (NRF):
- It was established by an Act of Parliament in 2023.
- It will focus only on basic science research, not applied science.
- Its governing board is chaired by the Prime Minister.
Which of the statements given above is/are correct? (Prelims 2024 style)
(a) 1 only
(b) 1 and 3 only
(c) 2 and 3 only
(d) 1, 2 and 3
(b) 1 and 3 only
Q3. The "Scientific Method" involves a series of steps. Which of the following is the correct sequence?
(a) Hypothesis → Observation → Experiment → Conclusion
(b) Observation → Hypothesis → Experiment → Conclusion
(c) Experiment → Observation → Hypothesis → Conclusion
(d) Conclusion → Hypothesis → Observation → Experiment
(b) Observation → Hypothesis → Experiment → Conclusion
