With UPSC Civil Services Prelims 2026 just 10 days away on 24th May 2026, Science & Technology is the section where smart aspirants quietly steal 8–10 marks while everyone else is still wrestling with Polity. In the last five years, S&T has contributed roughly 12–18 questions every year, and 80% of those have been pure current-affairs picks — ISRO launches, government missions, policy announcements, and emerging-tech terms that surfaced in the news between June 2025 and April 2026.
This is your final-stretch, no-fluff revision sheet for the highest-yield S&T themes UPSC is most likely to dip into this year. Skim it once today, again on day T-3, and on the morning of the paper. Every topic below is timestamped to the news cycle you actually lived through — no static NCERT padding.
Why Science & Technology Decides Borderline Cases
Look at any Prelims cut-off post-mortem and you will find the same pattern: candidates who clear the line by 2–4 marks have almost always picked up an extra 4–6 from S&T. The reason is structural. Polity, Economy and History have huge static syllabi where everyone is roughly equally prepared, so the variance in scores is small. S&T, in contrast, has a tiny static spine and a massive, fast-moving current-affairs surface — which means aspirants who actually tracked PIB, ISRO press notes, and the Ministry of Science & Technology releases over the year walk in with a clear edge. If you have ignored this section so far, the next 10 days are exactly the right window to fix that. The topics below are ordered by probability of appearance, weighted by recency, official-source coverage, and frequency of mention in standard sources like PIB, PRS, and the Economic Survey.
1. ISRO — Gaganyaan, Chandrayaan-4 and the Bharatiya Antariksh Station
Gaganyaan is the single most testable item in this year’s S&T pool. The programme’s first uncrewed flight (G1) is officially scheduled for the second half of 2026 and will carry Vyommitra, a humanoid robot with female features capable of speaking with ground controllers and reading instrument panels. Two more uncrewed missions (G2, G3) follow before the first crewed flight (H1) — now slipped to Q1 2027 — places Indian astronauts in low-Earth orbit. The four announced astronaut-designates remain Prasanth Balakrishnan Nair, Ajit Krishnan, Angad Pratap and Shubhanshu Shukla, all Indian Air Force pilots. On 19 February 2026, ISRO and DRDO completed the final qualification-level load test at the Terminal Ballistics Research Laboratory (TBRL) in Chandigarh — a fact-set ripe for a “which of the following is correct” stem.
Chandrayaan-4, the lunar sample-return mission planned around 2028 in collaboration with Japan (the LUPEX configuration), is designed to fly in five modules across two launches and bring back up to 3 kg of lunar regolith from the south-pole region. Shukrayaan, India’s Venus orbiter, received Cabinet approval in late 2024 and is also targeting a 2028 launch window to study Venusian surface, atmosphere and geology. Expect at least one statement-based question on which mission targets which body and which collaborator is involved.
The Bharatiya Antariksh Station, India’s proposed space station, has 2035 as its target completion year, with the first module slated for 2028. Keep these dates handy — UPSC has a long history of testing target years for flagship programmes.
2. India Semiconductor Mission 2.0 and Electronics Manufacturing
The Union Budget 2026–27 formally launched India Semiconductor Mission (ISM) 2.0 with a ₹1,000 crore allocation for FY 2026–27. Unlike ISM 1.0, which focused primarily on fab incentives, ISM 2.0 targets three frontier capabilities: (a) producing semiconductor equipment and materials domestically, (b) designing full-stack Indian semiconductor IP, and (c) fortifying both domestic and global supply chains. The Modified Programme for Semiconductor and Display Manufacturing Ecosystem has a total outlay of ₹8,000 crore for 2026–27.
The Union Cabinet approved four additional fab and ATMP projects in Odisha, Punjab and Andhra Pradesh, taking the ISM project count to 10 spread across six states. Under the Design-Linked Incentive (DLI) scheme, 24 semiconductor design startups are currently supported and have collectively attracted nearly ₹430 crore in venture capital as of January 2026 — a textbook example of “which ministry administers” or “which year was the scheme launched” question fodder. The nodal ministry is the Ministry of Electronics and Information Technology (MeitY), and ISM operates under the Digital India Corporation.
3. IndiaAI Mission, AI Compute and the India AI Impact Summit 2026
The IndiaAI Mission, approved by the Cabinet in March 2024 with a ₹10,371.92 crore outlay, has become the defining digital-policy story of 2025–26. By March 2026, over 38,000 GPUs had been onboarded on the AI Compute Portal, with an additional 20,000 GPUs being added; the government’s stated target is 100,000 GPUs by end-2026. Compute is offered to eligible startups and researchers at ₹115–150 per GPU-hour — roughly 42% below market rates — with up to a 40% additional subsidy for projects of national importance.
The flagship event of the cycle was the India AI Impact Summit 2026, held from 16–21 February 2026, with approximately 6 lakh in-person attendees, 9 lakh cumulative live-stream viewers and delegations from over 100 countries and 20 international organisations. The Summit’s Global Declaration is a likely “which of the following is/are correct” item. Under the IndiaAI Foundation Models pillar, 12 teams were shortlisted from roughly 506 proposals to build indigenous large language models, with a focus on Indian languages, agriculture, healthcare and governance. The nodal ministry is MeitY.
4. BioE3 Policy and the Biomanufacturing Push
The BioE3 Policy — Biotechnology for Economy, Environment and Employment — approved by the Cabinet in August 2024 under the Department of Biotechnology, is one of the most exam-relevant policy launches of the cycle. It targets six thematic sectors: high-value bio-based chemicals, biopolymers and enzymes; smart proteins and functional foods; precision biotherapeutics; climate-resilient agriculture; carbon capture and utilisation; and marine and space research.
The policy envisions 16 biomanufacturing hubs spread across tier-II and tier-III cities, aligns with India’s Net-Zero 2070 pledge through a circular bio-economy model, and aims to slot biotechnology as a contributor to the projected $2–4 trillion bio-economy over the next decade. Expect a question pairing BioE3 with either the parent ministry (Ministry of Science & Technology — DBT) or with one of the six thematic sectors as a distractor.
5. Quantum Mission, Bharat 6G and Emerging Tech Terminology
The National Quantum Mission, approved in April 2023 with a ₹6,003.65 crore outlay over 2023–24 to 2030–31, focuses on four verticals: quantum computing (target: 50–1000 physical qubits in 8 years), quantum communication, quantum sensing & metrology, and quantum materials & devices. Four thematic hubs anchor the mission at IISc Bengaluru, IIT Madras, IIT Bombay and IIT Delhi. The nodal department is the Department of Science and Technology (DST).
Bharat 6G Vision, released by the Prime Minister on 23 March 2023, positions India as a frontline contributor to 6G design and deployment by 2030, anchored in affordability, sustainability and ubiquity. The Bharat 6G Alliance now has 80+ member organisations including 30+ startups. The Bharat 6G 2026 International Conference is scheduled for 22 May 2026 in New Delhi — two days before Prelims itself, so any developments that week could surface in next year’s paper, but the broader Vision document is fair game this year.
Other terms worth memorising to one-line definitions: edge computing, federated learning, neuromorphic chips, terahertz communication, distributed ledger technology, post-quantum cryptography, and digital twins. UPSC loves to drop one of these into a multi-statement question alongside a misdefined option.
6. Health Biotech — Vaccines, Gene Therapy and Rare Diseases
India approved its first indigenous CAR-T cell therapy (NexCAR19, developed by IIT Bombay and Tata Memorial Centre) for relapsed/refractory B-cell lymphomas — a landmark in affordable gene therapy and a near-certain S&T question if it has not already appeared. The National Policy for Rare Diseases (2021, revised) and the Pradhan Mantri TB Mukt Bharat Abhiyaan also remain in scope. CRISPR-Cas9 base-editing, mRNA platform vaccines, and antimicrobial resistance under the One Health framework round out the biotech cluster.
7. Defence & Strategic Technology
Agni-Prime, the Pralay tactical ballistic missile, the Mission Divyastra MIRV test (Agni-V), the indigenous Tejas Mk-1A induction, the Zorawar light tank, and DRDO’s Pinaka extended-range tests are the highest-probability defence picks. Pair each with its developer (DRDO, BDL, HAL) and the relevant range or payload — UPSC questions are usually 4-statement, single-fact items.
Frequently Asked Questions
How many Science & Technology questions appear in UPSC Prelims?
Historically, 12–18 questions per year, contributing roughly 24–36 marks. Of these, 70–80% are current-affairs driven, so a focused 10-day current-affairs revision can realistically net 8–12 correct answers.
Which is the single most important source for S&T current affairs?
The Press Information Bureau (PIB), specifically releases tagged to the Ministry of Science & Technology, Department of Space (ISRO), MeitY, and the Department of Biotechnology. ISRO’s own mission updates page and the IndiaAI portal supplement PIB well.
Should I memorise full mission specifications or only headline facts?
Headline facts win. UPSC tests: name of the mission, year of approval, nodal ministry/agency, target launch or completion year, one defining objective, and lead collaborator (if any). Going beyond this rarely pays off in Prelims.
Is static NCERT Science still relevant for Prelims 2026?
Yes, but at a lower weight than current affairs. NCERT Class 9–12 Biology and Physics chapters on biotechnology, microbes, communication systems and electronics still cover roughly 3–5 questions each year. Skim, don’t deep-read, in this final stretch.
Practice MCQs — Try These in 5 Minutes
Q1. The Gaganyaan G1 mission, scheduled for the second half of 2026, will carry which of the following?
(a) A two-member crew
(b) The humanoid robot Vyommitra
(c) An indigenous lunar lander
(d) A Venus atmosphere probe
Q2. With reference to India Semiconductor Mission 2.0, consider the following statements:
1. It was announced in the Union Budget 2026–27.
2. It focuses exclusively on fabrication units (fabs), not on design or materials.
3. It is administered under the Ministry of Electronics and Information Technology.
Which of the above are correct?
(a) 1 and 2 only (b) 1 and 3 only (c) 2 and 3 only (d) 1, 2 and 3
Q3. The BioE3 Policy, 2024 focuses on which of the following thematic sectors?
1. Smart proteins and functional foods
2. Precision biotherapeutics
3. Carbon capture and utilisation
4. Defence electronics
Select the correct answer:
(a) 1, 2 and 3 only (b) 1, 2 and 4 only (c) 2, 3 and 4 only (d) 1, 2, 3 and 4
Q4. The National Quantum Mission, approved in 2023, has its hubs at which of the following institutions?
1. IISc Bengaluru 2. IIT Madras 3. IIT Bombay 4. IIT Delhi
(a) 1 and 2 only (b) 1, 2 and 3 only (c) 2, 3 and 4 only (d) 1, 2, 3 and 4
Q5. Consider the following with reference to IndiaAI Mission:
1. It was approved by the Cabinet in 2024.
2. The AI Compute Portal aims to onboard 100,000 GPUs by end of 2026.
3. It is implemented under the Department of Science and Technology.
Which are correct?
(a) 1 and 2 only (b) 1 and 3 only (c) 2 and 3 only (d) 1, 2 and 3
Answer Key: Q1 — (b); Q2 — (b); Q3 — (a); Q4 — (d); Q5 — (a).
Internal Resources for Final Revision
Pair this S&T sheet with the following Civils Gyani revision artefacts already on the site:
- UPSC Prelims 2026: Centre, City Slip & Admit-Card Verification Guide — log the logistics today so you do not lose Day T-3 to paperwork.
- Top 50 Government Schemes for UPSC Prelims 2026 — many S&T policies overlap with scheme nomenclature; cross-link as you revise.
- Environment & Ecology: T-12 Final Revision — bio-economy, carbon capture and One Health overlap with both S&T and Environment.
Final Word for the Next 10 Days
S&T rewards calm, repeated revision over panicked deep-reading. Read this sheet today, again on T-5, and once more on the morning of 24 May 2026. Make a one-page handwritten cheat-list of mission names, launch years and nodal ministries — that single page is worth more than any 200-page compilation. And remember: in a section this current-affairs-heavy, the candidate who has merely noticed the news will already beat the candidate who has only read the textbook.
You are 10 days out. Trust the revision, sleep on time, and walk in confident.
