Change set

Pick exam & year, then Go.

Question map
Not attempted Correct Incorrect ★ Bookmarked
Loading…
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.

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.
40%
got it right
✓ Thank you! We'll review this.

SIMILAR QUESTIONS

UPPCS · 2025 · Q112 Relevance score: -0.59

With reference to 'Silver articles', which of the following statements is/are correct ?
1. Silver articles turn black after some time when exposed to air.
2. It happens due to coating of silver sulphide.
Select the correct answer from the code given below :
Code :

NDA-I · 2018 · Q69 Relevance score: -1.49

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 :

CDS-I · 2017 · Q76 Relevance score: -1.56

Which of the following statements is/are correct? 1. In June 2016, the LIGO group of scientists announced the detection of a second set of gravitational waves. 2. Gravitational waves were generated due to merger of two black holes at about 1-4 billion light-years distant. 3. Gravitational waves were inserted due to collision of two white dwarf stars at about 1 -4 billion light-years distant. Select the correct answer using the code given below.

CDS-I · 2010 · Q81 Relevance score: -1.95

In the month of October 2009, the Indian Air Force in Mumbai airport forced a flight on North American Airlines Boeing 767 to land. Which of the following statements in this respect is/are correct ? 1. It was forced to land, because the Indian Air Force was reported that there was a bomb planted in the plane. 2. The plane was travelling to Bangkok, Thailand from Fujiriah, United Arab Emirates. 3. The plane was carrying US troops. Select the correct answer using the code given below: