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Q69 (IAS/2026) Science & Technology › Basic Science (Physics, Chemistry, Biology) Official Key

Which of the following statements with regard to Black Boxes used in modern aircrafts is/are correct?
1. They carry a beacon emitting red light pulses to facilitate underwater detection.
2. They record both the cockpit voice and flight data.
3. Their memory units are made using either stainless steel or titanium.
Select the answer using the code given below:

Result
Your answer: —  ·  Correct: B

Explanation

Statement 1 is incorrect: The Underwater Locator Beacon (ULB) attached to a black box emits an ultrasonic acoustic pulse (often called a "ping") at 37.5 kHz, not red light pulses. Acoustic signals are used because sound travels much farther and more reliably underwater than light.

Statement 2 is correct: Modern aircraft "black boxes" actually consist of two distinct devices: the Flight Data Recorder (FDR), which records technical flight parameters (like altitude, airspeed, and heading), and the Cockpit Voice Recorder (CVR), which records audio in the cockpit.

Statement 3 is correct: The crucial component that stores the data is the Crash Survivable Memory Unit (CSMU). To protect the solid-state memory boards from extreme impact, crushing forces, and intense fire, the CSMU is encased in heavy-duty armor made of either titanium or stainless steel.

Therefore, only statements 2 and 3 are correct.

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PROVENANCE & STUDY PATTERN

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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 Black Boxes used in modern aircrafts is/are correct? 1. They carry a beacon emitting red li…
At a glance
Origin: Mostly Current Affairs Fairness: Low / Borderline fairness Books / CA: 0/10 · 10/10
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This is a classic applied science and technology question triggered by recent aviation incidents. It tests your ability to look past the colloquial term 'Black Box' and understand its actual engineering components. Relying solely on standard books won't help here; you need to read the 'Explained' sections of newspapers when major tech-related events occur.

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 aircraft black boxes carry a beacon emitting red light pulses for underwater detection?
Origin: Web / Current Affairs Fairness: CA heavy Web-answerable
Web / Current Affairs
pmc.ncbi.nlm.nih.gov Standard ref
Presence: 5/5
"If an aircraft crashes into water, an underwater locator beacon (ULB), which is installed on the FDR, is triggered by water immersion, and emits an ultrasonic 10 ms pulse signal once per second at 37.5 kHz. This pulse signal can be detected by sonar equipment."
Why this source?
  • Explains that the Underwater Locator Beacon (ULB) on a flight data recorder (FDR) is triggered by water immersion.
  • Specifies that the beacon emits an ultrasonic pulse signal (37.5 kHz) rather than light.
  • Confirms the signal is designed for detection by sonar equipment, which relies on sound waves, not visual light pulses.
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