UPSC Prelims 2026 · Question 68 of 96

UPSC Prelims 2026 question on Stealth Technology

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:

  1. 1 only
  2. 2 and 3 only
  3. 1 and 2 only
  4. 1, 2 and 3
Show answer

Answer: C. 1 and 2 only

Verdict

Statements 1 and 2 are correct, so the answer is Option (c).

Analysis

Stealth technology is intended to reduce the detectability of aircraft, ships, and other military platforms by radar, infrared systems, and other surveillance methods. One of its primary objectives is minimizing the radar cross-section (RCS) through specialized shaping and the use of Radar Absorbing Materials (RAM).

Statement by statement

Statement 1 is correct: Stealth objects have a very small radar cross-section and are coated with Radar Absorbing Material. Stealth technology combines aerodynamic shaping that deflects radar waves away from the source and RAM coatings that absorb radar energy, thereby reducing the radar cross-section.

Statement 2 is correct: Stealth objects can be detected using specific frequencies. Although stealth technology reduces detectability, low-frequency radars such as VHF and UHF can still detect stealth objects because their wavelengths are comparable to aircraft dimensions, making stealth shaping less effective. Bistatic and multistatic radar systems can also improve detection.

Statement 3 is incorrect: Metamaterials used in stealth applications are designed to absorb or redirect electromagnetic waves to reduce scattering and not increase scattering. Increasing scattering would enhance radar visibility and defeat the purpose of stealth technology.

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