उन्नत विज्ञान-प्रौद्योगिकी

हिंदी में पढ़ें

Advanced Science & Technology (उन्नत विज्ञान एवं प्रौद्योगिकी)

The Hook: A Rocket That Landed Backwards

On 23 August 2023, India did something no nation had ever done — it soft-landed a spacecraft near the south pole of the Moon. Chandrayaan-3's Vikram lander touched down, and India became only the fourth country to soft-land on the Moon (after the USSR, USA, and China) and the first to land near the lunar south pole. The mission cost less than many Hollywood movies. That is the spirit of Indian science and technology — frugal, precise, and exam-relevant.

Every competitive exam — SSC CGL, IBPS PO, State PCS — now asks questions from Science & Technology (विज्ञान एवं प्रौद्योगिकी). The good news: the facts are static, finite, and highly predictable. Master this chapter once, revise it three times, and these marks are yours.

Learning Objectives

By the end of this chapter, you will be able to:

1. Recall India's major space missions, launch vehicles, and space centres.
2. Explain nuclear energy basics and India's nuclear programme structure.
3. Describe defence systems — missiles (Agni, Prithvi, BrahMos), DRDO, and the Integrated Guided Missile Development Programme.
4. Understand biotechnology, IT initiatives, and emerging tech (AI, quantum, semiconductors).
5. Spot and defeat the examiner's favourite traps in S&T questions.

Part 1: India's Space Programme

1.1 The Foundations

• ISRO (Indian Space Research Organisation) — formed 15 August 1969, headquarters Bengaluru. It superseded INCOSPAR (1962), set up under Dr. Vikram Sarabhai, the "Father of the Indian Space Programme."
• First Indian satellite: Aryabhata (1975) — launched by the USSR, not by India. Classic trap!
• First Indian launch vehicle: SLV-3 (1980) — placed the Rohini satellite in orbit. Project director: Dr. A.P.J. Abdul Kalam.
• Satish Dhawan Space Centre (SDSC), Sriharikota (Andhra Pradesh) — India's main launch port.
• Thumba (Kerala) — where it all began; the first sounding rocket was launched in 1963. TERLS (Thumba Equatorial Rocket Launching Station) is here.

🧠 Active Recall: Who launched Aryabhata — India or the USSR? Which vehicle put Rohini in orbit, and who led that project?

1.2 Launch Vehicles — The Workhorses

Mnemonic — "P-G-L-S" = "Please Go Launch Satellites" (PSLV → GSLV → LVM3 → SSLV). Note: this is just a memory aid for the four vehicle names — it is not an order of lifting power (SSLV actually carries the smallest payloads, while LVM3 is the heaviest lifter).

1.3 Landmark Missions

• Chandrayaan-1 (2008): PSLV launch; carried the Moon Impact Probe; its instruments helped confirm water molecules on the Moon.
• Mars Orbiter Mission / Mangalyaan (2013): India became the first Asian nation to reach Mars orbit and the first nation in the world to do so in its first attempt.
• Chandrayaan-2 (2019): Orbiter succeeded; the Vikram lander crashed during descent.
• Chandrayaan-3 (2023): Successful soft landing near the lunar south pole. Lander Vikram, rover Pragyan. Landing site named Shiv Shakti Point.
• Aditya-L1 (2023): India's first mission to study the Sun, placed at Lagrange Point 1 (~1.5 million km from Earth).
• Gaganyaan: India's upcoming human spaceflight mission; four astronaut-designates (IAF test pilots) announced in 2024.

🧠 Active Recall: Which mission reached Mars in the first attempt? What is Aditya-L1, and where does it sit?

1.4 Navigation & Others

• NavIC (Navigation with Indian Constellation), earlier IRNSS — India's own regional navigation system, 7 satellites, covering India and ~1,500 km beyond. Compare: GPS (USA), GLONASS (Russia), Galileo (EU), BeiDou (China).
• IN-SPACe — nodal agency to promote private sector participation in space (HQ: Ahmedabad).
• NSIL (NewSpace India Ltd) — ISRO's commercial arm.

Part 2: Nuclear Science & Energy

2.1 The Basics

• Nuclear fission: a heavy nucleus (Uranium-235, Plutonium-239) splits → energy. Used in reactors and atom bombs.
• Nuclear fusion: light nuclei (hydrogen isotopes) join → energy. Powers the Sun; basis of the hydrogen bomb.
• Homi J. Bhabha — Father of the Indian nuclear programme. BARC (Bhabha Atomic Research Centre), Mumbai, is named after him.
• India's first nuclear reactor: Apsara (1956) — also Asia's first (outside the USSR). Located at BARC.
• Three-stage nuclear power programme (Bhabha's vision): Stage 1 — Pressurised Heavy Water Reactors (natural uranium) → Stage 2 — Fast Breeder Reactors (plutonium) → Stage 3 — Thorium-based reactors. India holds among the world's largest thorium reserves (monazite sands of the Kerala coast).

2.2 Key Facts

• NPCIL (Nuclear Power Corporation of India Ltd) operates India's nuclear power plants.
• Major plants: Tarapur (Maharashtra — India's first nuclear power station, 1969), Kudankulam (Tamil Nadu — largest, built with Russian collaboration), Kalpakkam (Tamil Nadu — Prototype Fast Breeder Reactor), Rawatbhata (Rajasthan), Narora (UP), Kakrapar (Gujarat).
• Pokhran tests: Pokhran-I ("Smiling Buddha", 1974) — peaceful nuclear explosion; Pokhran-II ("Operation Shakti", 1998) — five tests, after which India declared itself a nuclear-weapon state.
• India follows a "No First Use" nuclear doctrine.

Mnemonic — "T-K-K-R-N-K" for plants: "Tarapur Kudankulam Kalpakkam Rawatbhata Narora Kakrapar" — remember "Two Kings Keep Royal Nuclear Keys."

🧠 Active Recall: What was Smiling Buddha? Which stage of Bhabha's programme uses thorium?

Part 3: Defence Technology

3.1 Missiles — IGMDP

The Integrated Guided Missile Development Programme (IGMDP) was launched in 1983 under Dr. A.P.J. Abdul Kalam ("Missile Man of India"). It produced five missile systems:

Mnemonic — "P-A-A-N-T": "Prithvi Agni Akash Nag Trishul" — "PAAN, the five-leaf missile bouquet."

• BrahMos: Indo-Russian joint venture supersonic cruise missile; name from Brahmaputra + Moskva rivers. Flies at about Mach 3. Can be launched from land, sea, and air.
• Ballistic vs Cruise (favourite trap!): Ballistic missiles follow a high arcing trajectory (like a thrown stone — Agni, Prithvi); cruise missiles fly low, powered throughout, like a small aircraft (BrahMos, Nirbhay).

3.2 Organisations & Systems

• DRDO (Defence Research and Development Organisation) — formed 1958, HQ New Delhi.
• INS Arihant — India's first indigenous nuclear-powered ballistic missile submarine (SSBN).
• INS Vikrant — India's first indigenously built aircraft carrier (commissioned 2022). Don't confuse with the older INS Vikrant (decommissioned 1997).
• Tejas — indigenous Light Combat Aircraft (LCA), built by HAL.
• Agni-P (Agni Prime), Pralay, Hypersonic Technology Demonstrator Vehicle (HSTDV) — newer systems.

🧠 Active Recall: Is BrahMos ballistic or cruise? Which country partners India in BrahMos? What class of vessel is INS Arihant?

Part 4: Biotechnology & Health

• DNA — Deoxyribonucleic acid; double helix structure described by Watson and Crick (1953) (using Rosalind Franklin's X-ray data).
• Human Genome Project — completed 2003; mapped all human genes.
• Stem cells — undifferentiated cells that can become specialised cells.
• Vaccines: BCG (tuberculosis — developed by Calmette and Guérin); DPT (diphtheria, pertussis, tetanus); OPV (oral polio vaccine — Albert Sabin); Covaxin — India's indigenous COVID-19 vaccine by Bharat Biotech with ICMR; Covishield — by Serum Institute of India (Oxford-AstraZeneca formula).
• CERVAVAC — India's first indigenously developed quadrivalent HPV vaccine (against cervical cancer), by Serum Institute of India.
• Cloning: Dolly the sheep (1996) — first mammal cloned from an adult somatic cell.
• Bt Cotton — the only GM crop approved for commercial cultivation in India.

Part 5: IT, Emerging Tech & Institutions

• Supercomputers: India's PARAM series (built by C-DAC, Pune). First: PARAM 8000 (1991). Recent systems include PARAM Siddhi-AI and machines under the National Supercomputing Mission.
• Internet: Vint Cerf is called the "Father of the Internet" (TCP/IP). The WWW was invented by Tim Berners-Lee (1989) at CERN.
• 5G launched in India in October 2022.
• Semiconductors: India Semiconductor Mission (2021); chip fabrication plants approved in Gujarat (e.g., the Tata-PSMC fab at Dholera, approved 2024).
• Quantum: National Quantum Mission approved 2023 (~₹6,000 crore) — quantum computing, communication, sensing, materials.
• AI: IndiaAI Mission approved 2024.
• Key institutions: CSIR (1942), IITs (first: IIT Kharagpur, 1951), IISc Bengaluru (1909), TIFR (1945, founded by Bhabha), NITI Aayog (2015, replaced the Planning Commission).

Mnemonic — "Father figures": Sarabhai = Space, Bhabha = Bombs/Nuclear, Kalam = Missiles, Vint Cerf = Internet, Berners-Lee = Web. Remember: "Space Bomb Kalam Very Bright" (Sarabhai, Bhabha, Kalam, Vint, Berners-Lee).

🧠 Active Recall: Who built the PARAM series? In which year was the WWW invented, and by whom?

🔗 Static-Dynamic Link

• Chandrayaan-3 (2023) and Aditya-L1 (2023) made lunar/solar mission facts hot in 2024 exams — expect questions on Shiv Shakti Point, Lagrange points, and LVM3.
• Semiconductor fabs (2024 approvals) and the National Quantum Mission (2023) connect static institutional knowledge to current policy — exams increasingly ask "which mission/ministry" questions.
• Gaganyaan astronaut announcement (2024) keeps human spaceflight in the news; know that the four astronaut-designates are IAF test pilots.

🔁 Linguistic Bridge: In Hindi We Say This, In English We Say That

⚠️ Caution: Examiner's Trap

Trap 1 — "लगभग सही कथन" (Almost-true statement): "Aryabhata was India's first satellite, launched by ISRO in 1975." Sounds perfect — but Aryabhata was launched by the USSR (from Kapustin Yar), not by India. India's own first launch was SLV-3/Rohini (1980). Examiners swap the launcher to catch the half-prepared.

Trap 2 — "समान नाम/वर्ष" (Similar names/dates): Chandrayaan-2 vs Chandrayaan-3 — both had a lander named Vikram and rover Pragyan, but only Chandrayaan-3 (2023) landed successfully. Similarly, INS Vikrant (old, decommissioned 1997) vs INS Vikrant (new indigenous carrier, 2022). Always check which one the question means.

Trap 3 — "विपरीत कार्य-कारण / श्रेणी भ्रम" (Category reversal): "BrahMos is a ballistic missile developed entirely by India." Two errors: BrahMos is a cruise missile, and it is an Indo-Russian joint venture. Examiners love flipping ballistic ↔ cruise and "indigenous" ↔ "joint venture."

📋 High-Yield Facts Table

📅 Revision Planner

After 2 days (Blurt Test): Close the book. On a blank sheet, write from memory: (a) all five IGMDP missiles with their types, (b) the three Chandrayaan missions with years and outcomes, (c) the three-stage nuclear programme. Check against the chapter; mark what you missed.

Weekly (Table Reconstruction): Redraw the High-Yield Facts Table and the missile table from memory. Then answer aloud: "Why is BrahMos not a ballistic missile?" and "Who launched Aryabhata?" — the two most-trapped facts.

Monthly (Trap Drill): Write three "almost-true" false statements yourself (one on space, one on nuclear, one on defence), then correct them. If you can build the trap, the examiner cannot catch you with it.

Revise after 2 days. Your memory of this chapter is a rocket — it needs three stages to reach orbit.