With reference to Agni-IV Missile, which of the following statements is/are correct? 1. It is surface-to surface missile 2. It is fuelled by liquid propellant only 3. It can deliver one-tonne nuclear warheads about 7500km away Select the correct answer using the code given below.
Contents16
- A1 only
- B2 and 3 only
- C1 and 3 only
- D1, 2 and 3
Show answer
Answer: (A) 1 only
Agni-IV facts:
(1) Surface-to-surface missile — CORRECT. It is launched from the ground to hit ground targets.
(2) Fuelled by liquid propellant only — WRONG. Agni-IV uses two stages of SOLID propellant (solid fuel is easier to store and quicker to launch).
(3) Range of 7500 km — WRONG. Agni-IV has a range of about 4,000 km (intermediate range). It's Agni-V that has 5,000+ km range.
Tip: For UPSC, remember the Agni family —
- Agni-I (700 km)
- Agni-II (2000 km)
- Agni-III (3000 km)
- Agni-IV (4000 km)
- Agni-V (5000+ km).
All use solid propellant.
Agni-IV is India's intermediate-range ballistic missile with about 4,000 km range, part of the strategic nuclear deterrent against regional threats.
UPSC tests Agni series specifications because these missiles represent India's indigenous defense capabilities and strategic autonomy in nuclear deterrence.
The question checks if students can distinguish between Agni-IV (4,000 km) and Agni-V (5,000+ km) ranges, and know that modern strategic missiles use solid fuel for quick deployment.
Agni Missile Series
Science And Technology Agni-IV surface-to-surface missile 7500km
Agni Missile Series: Classification, Range & UPSC Facts
All Agni missiles are surface-to-surface ballistic missiles with solid propellant
Agni-IV has 4,000 km range, not 7,500 km
Range progression: Agni-I (700 km) → Agni-V (5,000+ km)
Developed by DRDO for nuclear warhead delivery
What is Agni Series
The Agni missile series represents India's strategic ballistic missile capability developed by DRDO. All Agni missiles are surface-to-surface weapons designed to deliver nuclear warheads to ground targets from launch platforms on land.
Agni Missile Variants
Missile | Range (km) | Classification | Key Feature |
|---|---|---|---|
Agni-I | 700 | Short Range | Single stage, road mobile |
Agni-II | 2,000 | Medium Range | Two stage, rail/road mobile |
Agni-III | 3,000 | Intermediate Range | Two stage, road mobile |
Agni-IV | 4,000 | Intermediate Range | Two stage, road mobile |
Agni-V | 5,000+ | Intercontinental (ICBM) | Three stage, canisterised |
Technical Specifications
All Agni missiles use solid propellant - easier to store and faster to launch than liquid fuel
Two-stage design for Agni-II through Agni-IV increases range and accuracy
Can carry nuclear warheads weighing 1 tonne with high precision guidance
Road mobile launchers provide strategic mobility and survivability
Agni-V is India's first true ICBM capable of reaching most global targets
Question Analysis
The PYQ tested specific facts about Agni-IV: Statement 1 (surface-to-surface) was correct, but Statement 2 (liquid propellant) and Statement 3 (7,500 km range) were wrong. Students often confuse range figures between variants or assume liquid fuel like early space rockets.
Range confusion: Agni-IV is 4,000 km, not 7,500 km - don't mix up with Agni-V's intercontinental range
Propellant trap: All Agni missiles use solid fuel, not liquid - liquid is harder to store and slower to deploy
Classification trick: Surface-to-surface vs surface-to-air - Agni targets ground, not aircraft
Warhead weight: 1 tonne nuclear payload is standard across series, but range varies significantly
Missile Propulsion Systems
Science And Technology liquid propellant fuelled
Missile Propulsion: Solid vs Liquid Fuel Systems
Solid propellant missiles are faster to deploy and easier to store
Liquid propellant offers higher performance but complex handling
India's Agni series uses solid fuel, Prithvi uses liquid fuel
Propulsion System Comparison
Aspect | Solid Propellant | Liquid Propellant |
|---|---|---|
Storage | Simple, long-term stable | Complex, requires cooling/heating |
Launch Time | Minutes (instant readiness) | Hours (fueling required) |
Maintenance | Low, sealed system | High, regular servicing |
Performance | Lower specific impulse | Higher specific impulse |
Safety | Safer to handle | Toxic, explosive handling |
Cost | Lower operational cost | Higher operational cost |
Military Use | Strategic missiles (Agni) | Tactical missiles (Prithvi) |
Indian Missile Examples
Solid fuel missiles: Agni series, Akash SAM, Astra air-to-air missile
Liquid fuel missiles: Prithvi series, early space launch vehicles
Hybrid systems: Some advanced missiles combine both for optimization
Strategic preference: Military favors solid fuel for rapid response capability
Agni fuel trap: All Agni missiles use solid propellant, not liquid - remember 'Agni = Solid'
Performance confusion: Liquid fuel has better performance but solid fuel has operational advantages
Storage assumption: Don't assume liquid fuel is always better - solid fuel missiles can be stored ready-to-fire
Surface-to-Surface Missiles
Science And Technology surface-to-surface missile
Surface-to-Surface Missiles: Classification & Indian Arsenal
Surface-to-surface missiles launch from ground to hit ground targets
Include ballistic (high arc) and cruise (low altitude) types
India operates Agni, Prithvi, BrahMos as main surface-to-surface systems
Missile Classification by Launch-Target
# Missile Types
## Surface-to-Surface
- Agni (Ballistic)
- Prithvi (Ballistic)
- BrahMos (Cruise)
## Surface-to-Air
- Akash
- Trishul
- Quick Reaction SAM
## Air-to-Surface
- Rudram Anti-radiation
- Helina Anti-tank
## Air-to-Air
- Astra
- Python-5
- DerbyIndian Surface-to-Surface Missiles
Missile | Type | Range | Primary Role |
|---|---|---|---|
Agni Series | Ballistic | 700-5000+ km | Strategic nuclear delivery |
Prithvi Series | Ballistic | 150-600 km | Tactical battlefield support |
BrahMos | Cruise | 290-500 km | Precision conventional strike |
Nirbhay | Cruise | 1000 km | Long-range precision (under development) |
Prahaar | Ballistic | 150 km | Quick reaction tactical missile |
Key Distinctions
Ballistic trajectory: High parabolic path, gravity-assisted descent, harder to intercept
Cruise trajectory: Low altitude, terrain-following flight, air-breathing engines
Strategic vs Tactical: Long-range nuclear delivery vs battlefield conventional weapons
Launch platforms: Road mobile, rail mobile, silo-based, or submarine-launched variants
Direction confusion: Surface-to-surface hits ground targets, surface-to-air hits aircraft
Agni classification: All Agni missiles are surface-to-surface ballistic missiles, not cruise
BrahMos exception: Surface-to-surface cruise missile, not ballistic like Agni/Prithvi
DRDO Missile Programs
Science And Technology
DRDO Missile Development: IGMDP & Strategic Programs
IGMDP (1983-2012) developed India's core missile capabilities
Dr. APJ Abdul Kalam led the program as Chief Scientific Adviser
Achieved self-reliance in strategic and tactical missile systems
IGMDP Background
The Integrated Guided Missile Development Programme was launched in 1983 under Dr. APJ Abdul Kalam to develop indigenous missile technology. It aimed to create a comprehensive missile arsenal covering all ranges and targets for India's defence needs.
IGMDP Missile Systems
Missile | Target Type | Status | Key Achievement |
|---|---|---|---|
Prithvi | Surface-to-Surface | Operational | First indigenous ballistic missile |
Agni | Surface-to-Surface | Operational | Strategic nuclear delivery capability |
Trishul | Surface-to-Air | Discontinued | Technology demonstrator |
Akash | Surface-to-Air | Operational | Medium-range air defence |
Nag | Anti-Tank | Operational | Fire-and-forget capability |
Current DRDO Programs
BrahMos partnership: Joint development with Russia for supersonic cruise missiles
Advanced systems: Hypersonic missiles, anti-satellite weapons under development
Export potential: Successful sales of Akash SAM to international customers
Technology spinoffs: Missile tech contributing to space launch vehicles
Kalam connection: Remember APJ Abdul Kalam as the 'Missile Man' who led IGMDP
Timeline trap: IGMDP ran from 1983-2012, spanning nearly 30 years of development
Success rate: Not all IGMDP missiles succeeded - Trishul was discontinued, others operational