Which statements regarding stealth technology are correct?

Statements 1 and 2 are correct. Stealth objects have a very small radar cross-section (RCS) and are coated with Radar Absorbing Materials (RAM) to absorb electromagnetic radiation and reduce reflected radar signals. They can still be detected using specific radar frequencies, particularly low-frequency bands. However, stealth objects are not coated with metamaterials to increase scattering; instead, coatings aim to reduce radar returns.

What is the Long March 12B rocket and which statements about it are correct?

None of the statements are correct. The Long March 12B was launched by China, not Russia. It is not mandatory under global enforceable law to issue airspace closure notices before launches. The rocket is partially reusable with a reusable first stage only, not both stages.

What do black boxes in aircraft record?

Aircraft black boxes consist of two devices: the Cockpit Voice Recorder (CVR) and the Flight Data Recorder (FDR). The CVR records cockpit conversations and radio transmissions, while the FDR records flight parameters such as altitude, speed, and acceleration. They are stored in crash-resistant units made of steel or titanium.

Do aircraft black boxes emit red light pulses underwater?

No. Aircraft black boxes are equipped with an Underwater Locator Beacon (ULB) that emits ultrasonic acoustic signals (pings) for up to 30 days after submersion. They do not emit red light pulses.

Which defence hardware is manufactured in India?

Su-30 MKI fighter jets and T-90 Mk-III tanks are manufactured in India under licensed production. Su-30 MKI jets are produced by Hindustan Aeronautics Limited (HAL), and T-90 tanks are manufactured by Heavy Vehicles Factory in Avadi. Akula-class submarines are leased from Russia and not manufactured in India.

What is Dual Frequency Synthetic Aperture Radar (DFSAR)?

DFSAR is a microwave imaging instrument used to study the lunar surface and subsurface. It operates in L-band and S-band radar frequencies and was part of the Chandrayaan-2 mission. It became the first fully polarimetric synthetic aperture radar sent to study the Moon.

Was DFSAR part of Chandrayaan-3?

No. The Dual Frequency Synthetic Aperture Radar (DFSAR) instrument was onboard Chandrayaan-2, not Chandrayaan-3.

Daily UPSC Prelims MCQs - Science & Tech. - 10th June 2026

Jigyashu Mishra
2 days ago
1 min read

Test your UPSC CSE 2027 preparation with today’s Science & Technology (Every wednesday) Quiz — covering stealth technology, Black Boxes used in modern aircrafts, items of defence hardware, Dual Frequency Synthetic Aperture Radar (DFSAR) and more.

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