MCQ Detailed View

Stealth technology is a set of advanced engineering techniques used to make aircraft, ships, missiles, and other vehicles less detectable by radar, infrared sensors, and other detection systems. It does not make an aircraft completely invisible, but it significantly reduces its visibility, making it harder for enemy radar systems to track or lock onto the target.

This technology works mainly by absorbing and deflecting radar waves. Normally, when radar waves hit an object, they bounce back to the radar system, showing its location. Stealth aircraft are designed with special shapes and surface angles that scatter these radar waves away from the source instead of reflecting them back. Additionally, a special radar-absorbing coating or material is applied on the aircraft's surface to absorb a large part of the radar energy, further reducing its detection.

Other stealth measures include reducing infrared signatures (heat emissions from engines), minimizing noise levels, and avoiding electromagnetic emissions that can be traced. Modern stealth aircraft like the B-2 Spirit bomber and the F-22 Raptor fighter jet use a combination of these techniques to remain almost invisible to enemy detection systems.

Option 1 (a device making aircraft invisible) is incorrect because no single device can make an aircraft fully invisible to radar. Option 3 (spying technology) is unrelated, as stealth is about avoiding detection, not spying. Option 4 (dropping paratroopers stealthily) is also not related to radar invisibility.

Therefore, the correct answer is Option 2: A coating which reduces the visibility of an aircraft on radar, as it best explains the principle of stealth technology in practical use.