UPSC GS Paper III: Science Tech, Defence Technology, DRDO, Agni, BrahMos, ASAT, Indigenous

Must?Know

• DRDO (Defence Research and Development Organisation) established in 1958; functions under Ministry of Defence; headquartered in Delhi; responsible for development of cutting?edge military technologies.
• Agni series of ballistic missiles developed by DRDO under Integrated Guided Missile Development Programme (IGMDP), initiated in 1983 under Dr. A.P.J. Abdul Kalam.
• Agni?I: range ~700–900 km; single?stage, solid?propellant missile; inducted into Indian Army in 2007.
• Agni?II: range ~2,000 km; two?stage solid?fuelled missile; capable of carrying nuclear warheads; tested first in 1999.
• Agni?III: range ~3,500 km; two?stage solid?propellant missile; enables India to target most of China; first successful test in 2006.
• Agni?IV: range ~4,000 km; two?stage missile with ring laser gyro?based navigation; can carry 1?tonne payload; tested successfully in 2014.
• Agni?V: range ~5,000–5,500 km; three?stage solid?fuelled intercontinental ballistic missile (ICBM); can reach most of China and parts of Europe; first test in 2012; canister launched, enhancing mobility and readiness.
• Agni?P (Prime): new generation medium?range ballistic missile; range ~1,000–2,000 km; improved accuracy and reduced size; first test in 2021; replaces Agni?I and Agni?II.
• BrahMos missile: supersonic cruise missile developed by BrahMos Aerospace, a joint venture between DRDO (India) and NPO Mashinostroyeniya (Russia); established in 1998.
• BrahMos flies at Mach 2.8–3.0; world’s fastest cruise missile in operation; can be launched from land, sea, air, and sub-sea platforms.
• Land?based BrahMos inducted into Indian Army in 2007; first regiment deployed in Uttar Pradesh.
• Indian Navy uses ship?launched BrahMos on destroyers and frigates; INS Rajput first warship to deploy it in 2005.
• Air?launched BrahMos integrated with Su?30MKI fighter jets; first test from Su?30 in 2020; enhances deep strike capability.
• Undersea variant BrahMos?NG (Next Generation) in development; smaller, lighter, with improved stealth for submarine launch.
• DRDO’s ASAT (Anti?Satellite) test conducted on March 27, 2019; Mission Shakti; destroyed Microsat?R satellite in low Earth orbit (~277 km altitude).
• Mission Shakti made India the fourth country (after USA, Russia, China) to demonstrate ASAT capability; used a ballistic missile interceptor (PDV?MKII) as kill vehicle.
• ASAT test drew international concern over space debris; India clarified debris decayed within weeks due to low altitude.
• DRDO developed indigenous Light Combat Aircraft (LCA) Tejas; first flight in 2001; inducted into IAF in 2016; powered by GE F404 engine (imported), future variants to use indigenous Kaveri engine.
• Kaveri engine (GTX?35VS) developed by GTRE (DRDO); faced delays and performance issues; not yet flight?certified for Tejas.
• India’s first indigenously built aircraft carrier, INS Vikrant (IAC?1), launched in 2013; commissioned in 2022; built by Cochin Shipyard; powered by GE LM2500 gas turbines.
• INS Vikrant uses ski?jump design for STOBAR operations; carries MiG?29K fighters and indigenous HAL Dhruv helicopters.
• DRDO’s Laser Dazzler system developed to disrupt UAVs and optical sensors; tested in 2021; part of anti?drone defence.
• DRDO developed Indian Counter?Measure Dispensing System (ICMDS) for fighter jets; provides protection against infrared and radar?guided missiles.
• Pinaka multi?barrel rocket launcher (MBRL), developed by DRDO; range up to 75 km (Pinaka Mk?I); used during Kargil War (1999) for artillery support.
• Nag missile: third?generation anti?tank guided missile; developed by DRDO; fire?and?forget capability using imaging infrared (IIR) seeker; range ~4 km; launched from NAMICA platform.

Difficulty Level

Intermediate – requires knowledge of technical specifications, timelines, and indigenous vs. collaborative projects; questions often mix current developments with historical context.

Common UPSC Traps

Trap: BrahMos is fully indigenous – Fact: BrahMos is a joint Indo?Russian venture (50:50), though India has achieved near?full indigenization of components post?2016 due to sanctions and import substitution.
Trap: Agni?V is an ICBM with 5,500+ km range – Fact: Agni?V is classified as an intermediate-range ballistic missile (IRBM) with potential ICBM characteristics; true ICBMs start at 5,500 km, but Agni?V’s range (confirmed ~5,000 km) is borderline; future Agni?VI may cross into ICBM category.
Trap: DRDO developed INS Vikrant – Fact: INS Vikrant was designed by Indian Navy’s Warship Design Bureau (WDB) and built by Cochin Shipyard; DRDO contributed subsystems like radar and electronic warfare suites, but not the ship itself.

Practice MCQs

Question: Which of the following statements about Mission Shakti is correct?
A) It involved the destruction of a geostationary satellite using a surface-to-air missile.
B) It made India the third country to demonstrate anti-satellite capability after the US and China.
C) The test was conducted in January 2019 using a modified Prithvi Defence Vehicle.
D) The target satellite was Microsat-R, placed in low Earth orbit at about 277 km altitude.
Answer: D
Explanation: Mission Shakti targeted Microsat-R, an Indian satellite in low Earth orbit at ~277 km, destroyed using a PDV-MKII interceptor.
Why others fail: B is tempting but incorrect—Russia was the second country (1968), making India the fourth after US, Russia, and China.

Question: The Pinaka multi-barrel rocket launcher system, recently inducted into the Indian Army, was developed by:
A) Bharat Dynamics Limited (BDL)
B) Ordnance Factory Board (OFB)
C) Defence Research and Development Organisation (DRDO)
D) Larsen & Toubro (L&T)
Answer: C
Explanation: Pinaka MBRL was developed by DRDO’s Armament Research & Development Establishment (ARDE); production is now handled by BDL and private firms.
Why others fail: A is tempting because BDL is the primary production agency, but development was by DRDO.

Question: Which missile among the following is capable of being launched from a submarine?
A) Agni?III
B) BrahMos
C) Prithvi?II
D) Akash
Answer: B
Explanation: BrahMos has a sub-sea variant under development and testing; Agni series are land/road-mobile ballistic missiles not designed for submarine launch (yet).
Why others fail: A is tempting due to Agni’s strategic role, but India’s submarine-launched ballistic missile is K?series (e.g., K?15, K?4), not Agni.

Question: Consider the following statements about the Tejas fighter aircraft:

1. It is developed under the Light Combat Aircraft (LCA) programme by DRDO.

2. It uses the indigenous Kaveri engine in all operational variants.
Which of the statements given above is:
A) 1 only
B) 2 only
C) Both 1 and 2
D) Neither 1 nor 2
Answer: A
Explanation: Statement 1 is correct—Tejas is developed by Aeronautical Development Agency (ADA), under DRDO umbrella; statement 2 is false—operational Tejas Mk1 uses GE F404 engine; Kaveri engine is not yet flight-certified.
Why others fail: C is tempting due to emphasis on indigenization, but Kaveri is not in use.

Question: The BrahMos missile can be launched from all of the following platforms EXCEPT:
A) Sukhoi Su?30MKI
B) Kolkata?class destroyer
C) INS Arihant
D) Mobile land?based launcher
Answer: C
Explanation: BrahMos is integrated with Su?30MKI, Kolkata?class ships, and land platforms; INS Arihant is a nuclear submarine equipped with K?15 and K?4 SLBMs, not BrahMos.
Why others fail: B is tempting as BrahMos is naval, but Arihant is strategic deterrent platform, not designed for cruise missiles.

Last?Minute Revision

• DRDO founded: 1958
• IGMDP launched: 1983
• Agni-I range: ~700–900 km
• Agni-V range: ~5,000–5,500 km
• First Agni-V test: 2012
• BrahMos JV formed: 1998 (India-Russia)
• BrahMos speed: Mach 2.8–3.0
• First BrahMos induction: Indian Army, 2007
• Su?30MKI BrahMos test: 2020
• Mission Shakti date: March 27, 2019
• ASAT target: Microsat-R, LEO (~277 km)
• India’s ASAT rank: 4th (after US, Russia, China)
• LCA Tejas first flight: 2001
• Tejas induction: 2016
• Kaveri engine developer: GTRE (DRDO)
• INS Vikrant commissioned: September 2, 2022
• INS Vikrant builder: Cochin Shipyard
• Pinaka used in: Kargil War, 1999
• Pinaka Mk-I range: up to 45 km (original), now 75 km
• Nag missile seeker: Imaging Infrared (IIR)
• ASAT interceptor: PDV-MKII
• DRDO headquarters: New Delhi
• ADA full form: Aeronautical Development Agency
• BrahMos Aerospace: 50:50 India-Russia JV
• Agni-P first test: 2021
• verify from standard source: K-4 SLBM range (3,500 km)