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Q68 (IAS/2026) Science & Technology › Space & Defence Technology Official Key

Which of the following statements with regard to stealth technology is/are correct?
1. Stealth objects have a very small radar cross-section and are coated with Radar Absorbing Material.
2. Stealth objects can be detected using specific frequencies.
3. Stealth objects are coated with metamaterials to increase the scattering of electromagnetic radiation.
Select the answer using the code given below:

Result
Your answer: —  ·  Correct: C

Explanation

Statement 1 is correct: Stealth technology aims to make an object less visible to radar, infrared, and other detection methods. This is primarily achieved by reducing the Radar Cross-Section (RCS) through specific geometric shaping and by coating the object with Radar Absorbing Materials (RAM) that absorb radio waves.

Statement 2 is correct: Stealth objects are not completely invisible. Their shaping and RAM coatings are typically optimized to evade high-frequency radars (like X-band). However, they can often be detected using specific lower frequencies, such as VHF and UHF radars, which have longer wavelengths that can resonate with the physical dimensions of the aircraft.

Statement 3 is incorrect: Metamaterials are engineered to have properties not found in naturally occurring materials. While they are researched for stealth applications, their purpose is to absorb or bend electromagnetic radiation around the object to reduce its visibility, not to increase scattering. Increasing the scattering of electromagnetic radiation would increase the radar return, making the object more easily detectable.

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