Science & Technology in CDS GK is dominated by ISRO missions, DRDO systems, and emerging technology policies. Questions are highly factual: exact mission name, what it does, what was first or unique about it. The biggest CDS differentiator is knowing which lander/rover belongs to which mission and what “first” each mission achieved.
Q1. Chandrayaan-3’s Vikram lander touched down on August 23, 2023. What made this landing historically unique? (CDS I 2024)
(a) First lunar landing by India (b) First-ever soft landing near the Moon’s South Pole (c) First landing using AI-guided navigation (d) First joint India-USA Moon mission
Answer: (b) First-ever soft landing near the Moon’s South Pole
Chandrayaan-3 (Vikram lander) landed at ~69° South latitude — no other nation had ever achieved a soft landing at or near the lunar South Pole. USA (Apollo 11–17 landings), USSR (Luna series), and China (Chang’e series) all landed near the equatorial region. The South Pole is scientifically critical because permanently shadowed craters may contain water-ice (hydrogen detected by Chandrayaan-1 in 2008). India became the 4th nation to soft-land on Moon and the ONLY nation to land at South Pole. Landing date (August 23) is now celebrated as National Space Day.
Q2. Aditya-L1 mission is placed at the L1 Lagrange point. What is the primary scientific advantage of this location? (CDS II 2024)
(a) Closer proximity to the Moon for lunar observation (b) Uninterrupted view of the Sun without Earth or Moon blocking (c) Zero gravity environment for conducting experiments (d) Lower radiation exposure than other orbits
Answer: (b) Uninterrupted view of the Sun without Earth or Moon blocking
L1 (Lagrange Point 1) is located ~1.5 million km from Earth toward the Sun, where gravitational forces of Earth and Sun balance. Objects here maintain a stable position relative to Earth-Sun system. The halo orbit at L1 provides continuous, uneclipsed view of the Sun. This is crucial for studying solar phenomena (CMEs, flares) in real-time since even brief interruptions (eclipses) would miss rapid events. NASA’s SOHO, ESA’s LISA pathfinder also use L1. Aditya-L1 carries 7 payloads; primary = VELC (coronagraph studying solar corona). L4/L5 are 60° from Earth on Moon’s orbit — different from L1.
Q3. XPoSat, launched in December 2023, is India’s first X-ray polarimetry mission. What does it study? (CDS I 2025)
(a) Polarisation of X-rays from cosmic sources like black holes and pulsars (b) X-ray emissions from Earth’s atmosphere (c) X-ray telescoping of nearby stars in the Milky Way (d) X-ray mapping of the Moon’s surface
Answer: (a) Polarisation of X-rays from cosmic sources like black holes and pulsars
XPoSat (X-ray Polarimeter Satellite) is the world’s 2nd X-ray polarimetry mission after NASA’s IXPE (Imaging X-ray Polarimetry Explorer). Polarisation of X-rays = orientation of oscillation of X-ray waves; reveals magnetic field structure, emission geometry around extreme objects. Target sources: black holes, neutron stars, pulsars, magnetars. Two instruments: POLIX (measuring polarisation; developed by Raman Research Institute, Bengaluru) and XSPECT (spectroscopy; ISRO). In LEO (Low Earth Orbit; 650 km). CDS: know POLIX + XSPECT + RRI + ISRO collaboration.
Q4. CERVAVAC, India’s indigenous HPV vaccine, is significant for what reason? (CDS analytical)
(a) It is India’s first vaccine for any type of cancer (b) It is the world’s first cervical cancer vaccine (c) It targets HPV strains causing ~70% of cervical cancers at a fraction of imported vaccine cost (d) It was developed by DRDO, not a pharmaceutical company
Answer: (c) Targets HPV strains 16 & 18 (causing ~70% of cervical cancers) at cost Rs 200–400 vs Rs 3,500+ imported
CERVAVAC (CERvical cancer VACcine) = India’s first indigenous quadrivalent HPV (Human Papillomavirus) vaccine. Developed by Serum Institute of India (Pune). DCGI approved Jan 2023. Targets HPV types 6, 11 (genital warts) and 16, 18 (cervical cancer). India has 2nd largest cervical cancer burden globally (~1.23 lakh new cases/year; ~77,000 deaths). Gardasil (MSD) = imported alternative at Rs 3,500+ per dose. CERVAVAC at Rs 200–400 dramatically improves accessibility. Now included in National Immunisation Programme for girls 9–14 years. CDS tests: developer + target disease + why significant.
Q5. India’s National Quantum Mission has a total outlay of Rs 6,003 crore. What is India’s primary quantum computing target by 2031? (CDS pattern)
(a) First quantum satellite (b) Quantum computers with 50–1,000 physical qubits (c) Universal quantum internet (d) Quantum-secure payment systems only
Answer: (b) Quantum computers with 50–1,000 physical qubits by 2031
National Quantum Mission (NQM, 2023): Rs 6,003 crore; 8-year mission (2023–2031). 4 thematic hubs (T-Hubs): Quantum Computing (IIT Bombay), Quantum Communication (IISc Bengaluru), Quantum Sensing & Metrology (IIT Delhi), Quantum Materials (TIFR Mumbai). Target by 2031: intermediate-scale quantum computers (50–1,000 qubits); satellite-based quantum key distribution for secure communications; quantum sensors for imaging and navigation. India joins USA, China, EU, Canada as nations with dedicated NQM. Quantum advantage: certain computations (cryptography breaking, drug discovery simulation) exponentially faster than classical computers.
🤯 T1. Gaganyaan has 4 astronaut-designates but only 3 will fly. Shubhanshu Shukla is also assigned to AXIOM-4. What is AXIOM-4, and why is this CDS-exam-relevant?
AXIOM-4: Commercial space station mission to the International Space Station (ISS) by Axiom Space (USA). Gp Capt Shubhanshu Shukla selected as Mission Pilot — first Indian to fly to ISS; first Indian in space since Rakesh Sharma (1984, Soviet Soyuz T-11). Expected launch: 2025.
CDS relevance: (1) First Indian on ISS — “first-ever” milestone question; (2) India-USA space cooperation (Axiom is a US company, NASA coordinates ISS access); (3) Links to Gaganyaan — same astronaut pool, meaning India’s Gaganauts get real-world ISS experience before India’s own crewed mission; (4) Rakesh Sharma (1984) was last Indian in space — 40+ year gap being bridged.
CDS pattern: “Which Indian astronaut will join AXIOM-4 mission to ISS?” → Shubhanshu Shukla.
🤯 T2. NISAR is a joint NASA-ISRO mission. What is a Synthetic Aperture Radar (SAR), and why does NISAR need BOTH L-band and S-band frequencies?
SAR (Synthetic Aperture Radar): Active radar system that emits microwave pulses and measures reflections from Earth’s surface. Works in all weather, day & night (unlike optical cameras). SAR detects millimetre-level ground movement — useful for earthquake monitoring, glacier melt, urban subsidence, crop yield estimation.
L-band (NASA contribution, 24 cm wavelength): Longer waves penetrate vegetation canopy; can see through forest leaves to ground beneath. Applications: forest biomass measurement, underground soil moisture, ice sheet thickness.
S-band (ISRO contribution, 12 cm wavelength): Shorter waves; better for surface scattering. Applications: agricultural crop monitoring, surface deformation, coastal change.
Dual-frequency advantage: Different frequencies reveal different phenomena simultaneously. NISAR will cover entire Earth’s landmass every 12 days — most frequent global SAR coverage ever.
CDS exam: “Which bands does NISAR use?” = L-band (NASA) + S-band (ISRO). “What does SAR do that optical satellites cannot?” = Works in clouds/night; detects ground movement.