Change set

Pick exam & year, then Go.

Question map
Not attempted Correct Incorrect ★ Bookmarked
Loading…
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.

How others answered
Each bar shows the % of students who chose that option. Green bar = correct answer, blue outline = your choice.
Community Performance
Out of everyone who attempted this question.
26%
got it right

PROVENANCE & STUDY PATTERN

Guest preview
Don’t just practise – reverse-engineer the question. This panel shows where this PYQ came from (books / web), how the examiner broke it into hidden statements, and which nearby micro-concepts you were supposed to learn from it. Treat it like an autopsy of the question: what might have triggered it, which exact lines in the book matter, and what linked ideas you should carry forward to future questions.
Which of the following statements with regard to stealth technology is/are correct? 1. Stealth objects have a very small radar cross-section…
At a glance
Origin: Books + Current Affairs Fairness: Low / Borderline fairness Books / CA: 2.5/10 · 7.5/10
You're seeing a guest preview. The Verdict and first statement analysis are open. Login with Google to unlock all tabs.

This is a classic Science & Tech application question blending defense current affairs with core physics (electromagnetic spectrum). It is a borderline trap because it requires knowing the exact mechanism of metamaterials—they absorb or reduce scattering, not increase it.

How this question is built

This question can be broken into the following sub-statements. Tap a statement sentence to jump into its detailed analysis.

Statement 1
Do stealth objects have a very small radar cross-section?
Origin: Web / Current Affairs Fairness: CA heavy Web-answerable
Web / Current Affairs
www.pib.gov.in Primary · Govt
Presence: 5/5
"The ship has enhanced stealth features resulting in a reduced Radar Cross Section (RCS) achieved through efficient shaping of hull, full beam superstructure design, plated masts and use of radar transparent materials on exposed decks."
Why this source?
  • Official government release describing the commissioning of a stealth destroyer (INS Visakhapatnam).
  • Directly links 'enhanced stealth features' to a 'reduced Radar Cross Section (RCS)'.
  • Explains that this reduction is achieved through hull shaping and radar-transparent materials.
www.civilaviation.gov.in Primary · Govt
Presence: 4/5
"Radar Cross Section is the measure of a target's ability to reflect radar signals in the direction of radar receiver. A larger RCS indicates that an object is more easily detected."
Why this source?
  • Official guidelines from the Ministry of Civil Aviation regarding drone threats.
  • Defines Radar Cross Section (RCS) as the measure of a target's ability to reflect radar signals.
  • Explicitly states that a larger RCS makes an object more easily detected, implying stealth requires a small RCS.
faculty.nps.edu Standard ref
Presence: 5/5
Why this source?
  • News report on the commissioning of the stealth frigate INS Taragiri in early 2026.
  • Describes the ship's 'lethal stealth' as a result of a 'significantly reduced radar cross-section'.
  • Provides a contemporary context for the statement near the 2026 exam year.
How to study

This tab shows concrete study steps: what to underline in books, how to map current affairs, and how to prepare for similar questions.

Login with Google to unlock study guidance.

Micro-concepts

Discover the small, exam-centric ideas hidden in this question and where they appear in your books and notes.

Login with Google to unlock micro-concepts.

The Vault

Access hidden traps, elimination shortcuts, and Mains connections that give you an edge on every question.

Login with Google to unlock The Vault.

✓ Thank you! We'll review this.

SIMILAR QUESTIONS

IAS · 2015 · Q32 Relevance score: 3.04

With reference to 'Near Field Communication (NFC) Technology', which of the following statements is/are correct? 1. It is a contactless communication technology that uses electromagnetic radio fields. 2. NFC is designed for use by devices which can be at a distance of even a metre from each other. 3. NFC can use encryption when sending sensitive information. Select the correct answer using the code given below.

NDA-II · 2019 · Q49 Relevance score: 2.16

Let there be an object having some chemicals in it. It starts moving with a uniform velocity v, and a chemical reaction starts happening. In this case, which of the following statement/s is/are correct? 1) Chemical reactions happening in the system cannot change the velocity v of the centre of mass of the object. 2) Chemical reactions happening in the system cannot change the kinetic energy of the particles inside with respect to the centre of mass an object weighs 36g in air and has a volume of 8.0 cmof an object. Select the correct answer using the code given below:

NDA-I · 2018 · Q69 Relevance score: 2.10

Which of the following statements about electromagnetic waves, sound waves and water waves is/are correct ? 1. They exhibit reflection 2. They carry energy 3. They exert pressure 4. They can travel in vacuum Select the correct answer using the code given below :