UPSC CSE Prelims
Question 81
Consider the following actions:
- Detection of car crash/collision which results in the deployment of airbags almost instantaneously
- Detection of accidental free fall of a laptop towards the ground which results in the immediate turning off of the hard drive
- Detection of the tilt of the smartphone which results in the rotation of display between portrait and landscape mode
In how many of the above actions is the function of accelerometer required?
View correct answer and explanation
Correct answer: C
Correct Option: C (All three)
Explanation: Accelerometers measure acceleration, shocks and orientation, making all three devices able to trigger actions rapidly after physical changes.
Statement / Pair / Item-wise Analysis:
1. Correct/True - Crash sensors use sudden deceleration to trigger airbag deployment.
2. Correct/True - A free-fall sensor detects acceleration changes and can park a laptop hard drive.
3. Correct/True - A phone’s accelerometer determines orientation/gravity direction for portrait–landscape rotation.
Option-wise Analysis:
A. Incorrect-it counts 1, but items 1, 2, 3 qualify, giving 3.
B. Incorrect-it counts 2, but items 1, 2, 3 qualify, giving 3.
C. Correct-exactly 3 of the 3 listed items satisfy the condition.
D. Incorrect-it counts 0, but items 1, 2, 3 qualify, giving 3.