Space Technology & Defence Systems – Advanced Concepts (Page 3)
Shaktimatha Learning – Advanced Level (Unique English Edition)
Types of Orbits
Geostationary Orbit:
A satellite in this orbit appears fixed over one point on Earth. It is mainly used for communication and weather monitoring.
Polar Orbit:
Satellites move over the Earth’s poles and cover the entire surface. Used for mapping and remote sensing.
Low Earth Orbit (LEO):
Located closer to Earth, used for observation and space stations.
Rocket Engine Technology
Cryogenic Engine:
Uses extremely low temperatures for fuel storage and provides high efficiency. Mainly used in advanced launch vehicles.
Solid Fuel Engine:
Simple and reliable but less efficient.
Liquid Fuel Engine:
More efficient and controllable compared to solid fuel engines.
Modern Defence Technologies
- Hypersonic Missiles → Travel faster than Mach 5
- Ballistic Missile Defence System → Intercepts enemy missiles
- Anti-Satellite Weapons → Destroys satellites in space
- Reusable Launch Vehicles → Reduce mission cost
Integration of Space & Defence
Space and defence technologies are closely connected. Satellites help in surveillance, missile guidance, and real-time communication.
This integration strengthens national security and strategic capabilities.
Previous Year Type MCQs
1. A satellite that appears fixed over Earth is in which orbit?
A) Polar
B) Geostationary
C) LEO
D) None
2. Cryogenic engines are used for?
A) Low efficiency
B) High efficiency
C) Storage
D) Output
3. Hypersonic speed means?
A) Below Mach 1
B) Mach 2
C) Above Mach 5
D) None
4. ASAT is related to?
A) Communication
B) Navigation
C) Anti-satellite system
D) Storage
5. LEO satellites are used for?
A) Observation
B) Banking
C) Agriculture only
D) None
Answer Key
1. B
2. B
3. C
4. C
5. A
Exam Focus
- Orbits → Concept-based questions
- Engines → Frequently asked in exams
- Defence tech → Important for current affairs
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